commit fdef4b6e6a5f3a47effc5c388d3333370c688db1
Author: silverpill <silverpill@firemail.cc>
Date:   Fri Apr 9 00:22:17 2021 +0000

    Initial commit

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..904629c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,77 @@
+[package]
+name = "mitra"
+version = "0.1.0"
+description = "Mitra backend"
+license = "AGPL-3.0"
+
+edition = "2018"
+publish = false
+default-run = "mitra"
+
+[dependencies]
+# Used to handle incoming HTTP requests
+actix-cors = "0.5.4"
+actix-files = "0.5.0"
+actix-session = "0.4.1"
+actix-web = "3.3.2"
+# Used for managing async tasks
+actix-rt = "1.1.1"
+# Used for HTML sanitization
+ammonia = "3.1.2"
+# Used for working with RSA keys, HTTP signatures and file uploads
+base64 = "0.13.0"
+# Used for working with dates
+chrono = { version = "0.4.19", features = ["serde"] }
+# Used to build admin CLI tool
+clap = { version = "3.0.0-beta.2", default-features = false, features = ["std", "derive"] }
+# Used for pooling database connections
+deadpool = "0.7.0"
+deadpool-postgres = { version = "0.5.6", default-features = false }
+# Used to read .env files
+dotenv = "0.15.0"
+# Used to work with hexadecimal strings
+hex = "0.4.3"
+# Used for logging
+log = "0.4.14"
+env_logger = { version = "0.8.4", default-features = false }
+# Used to guess media type of a file
+mime_guess = "2.0.3"
+mime-sniffer = "0.1.2"
+# Used to determine the number of CPUs on the system
+num_cpus = "1.13.0"
+# Used to map postgres types to rust types
+postgres-types = { version = "0.1.2", features = ["derive", "with-chrono-0_4", "with-uuid-0_8", "with-serde_json-1"] }
+# Used for working with regular expressions
+regex = "1.5.4"
+# Used to generate random numbers
+rand = "0.8.3"
+# Used for managing database migrations
+refinery = { version = "0.4.0", features = ["tokio-postgres"] }
+# Used for making async HTTP requests
+reqwest = { version = "0.10.10", features = ["json"] }
+# Used for working with RSA keys
+rsa = "0.5.0"
+# Used for hashing passwords
+rust-argon2 = "0.8.3"
+# Used for working with ethereum keys
+secp256k1 = { version = "0.20.3", features = ["rand", "rand-std"] }
+# Used for serialization/deserialization
+# https://github.com/rust-db/refinery/issues/160
+serde = { version = "=1.0.117", features = ["derive"] }
+serde_json = "1.0"
+# Used to parse config file
+serde_yaml = "0.8.17"
+# Used to calculate SHA2 hashes
+sha2 = "0.9.5"
+# Used for creating error types
+thiserror = "1.0.24"
+# Async runtime ( required for #[tokio::main] )
+tokio = { version = "0.2.25", features = ["macros"] }
+# Used for working with Postgresql database (compatible with tokio 0.2)
+tokio-postgres = { version = "0.5.5", features = ["with-chrono-0_4", "with-uuid-0_8", "with-serde_json-1"] }
+# Used to work with URLs
+url = "2.2.2"
+# Used to work with UUIDs
+uuid = { version = "0.8.2", features = ["serde", "v4"] }
+# Used to query ethereum node
+web3 = { version = "0.15.0", default-features = false, features = ["http", "http-tls", "signing"] }
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..be3f7b2
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,661 @@
+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+  A patent license is "discriminatory" if it does not include within
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+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
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+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
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+  13. Remote Network Interaction; Use with the GNU General Public License.
+
+  Notwithstanding any other provision of this License, if you modify the
+Program, your modified version must prominently offer all users
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+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
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+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
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+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
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+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
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+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
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+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
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+
+Also add information on how to contact you by electronic and paper mail.
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+  If your software can interact with users remotely through a computer
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+  You should also get your employer (if you work as a programmer) or school,
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+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..9a48676
--- /dev/null
+++ b/README.md
@@ -0,0 +1,114 @@
+# Mitra
+
+Federated social network with smart contracts.
+
+- Built on [ActivityPub](https://activitypub.rocks/) protocol.
+- Lightweight.
+- Sign-in with Ethereum.
+- Converting posts into NFTs.
+- More crypto features in the future.
+
+**WIP: Mitra is not ready for production yet.**
+
+Demo instance: https://test.mitra.pm/ (invite-only)
+
+## Requirements
+
+- Rust 1.51+
+- Postgresql
+- IPFS node (optional)
+- Ethereum node (optional)
+
+## Development
+
+### Create database
+
+```
+docker-compose up
+```
+
+Test connection:
+
+```
+psql -h localhost -p 5432 -U mitra mitra
+```
+
+### Run web service
+
+Create config file:
+
+```
+cp config.yaml.example config.yaml
+```
+
+Compile and run service:
+
+```
+cargo run
+```
+
+### Run CLI
+
+```
+cargo run --bin mitractl
+```
+
+### Build for production
+
+```
+cargo build --release
+```
+
+## API
+
+### Mastodon API
+
+Endpoints are similar to Mastodon API:
+
+```
+GET /api/v1/accounts/{account_id}
+PATCH /api/v1/accounts/update_credentials
+GET /api/v1/accounts/relationships
+POST /api/v1/accounts/{account_id}/follow
+POST /api/v1/accounts/{account_id}/unfollow
+GET /api/v1/directory
+GET /api/v1/instance
+POST /api/v1/media
+GET /api/v2/search
+POST /api/v1/statuses
+GET /api/v1/statuses/{status_id}
+GET /api/v1/timelines/home
+```
+
+Extra APIs:
+
+```
+POST /api/v1/statuses/{status_id}/make_permanent
+GET /api/v1/statuses/{status_id}/signature
+```
+
+## CLI commands
+
+Delete profile:
+
+```
+mitractl delete-profile -i 55a3005f-f293-4168-ab70-6ab09a879679
+```
+
+Generate invite code:
+
+```
+mitractl generate-invite-code
+```
+
+List generated invites:
+
+```
+mitractl list-invite-codes
+```
+
+Generate ethereum address:
+
+```
+mitractl generate-ethereum-address
+```
diff --git a/config.yaml.example b/config.yaml.example
new file mode 100644
index 0000000..83977b3
--- /dev/null
+++ b/config.yaml.example
@@ -0,0 +1,29 @@
+database_url: postgres://mitra:mitra@127.0.0.1:5432/mitra
+
+http_host: '127.0.0.1'
+http_port: 8380
+
+# 32 symbols or more
+cookie_secret_key: null
+
+# domain name
+instance_uri: myserver.net
+instance_title: myserver
+instance_short_description: myserver is a federated social network
+# Long description can contain markdown syntax
+instance_description: myserver is a federated social network
+registrations_open: false
+# Login message must contain instance URL
+login_message: 'Sign this message to log in to https://myserver.net. Do not sign this message on other sites!'
+
+ethereum_json_rpc_url: 'http://127.0.0.1:8545'
+# Block explorer base URL (must be compatible with https://eips.ethereum.org/EIPS/eip-3091)
+ethereum_explorer_url: null
+ethereum_contract:
+  address: '0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512'
+  chain_id: 31337
+  signing_key: null
+
+ipfs_api_url: 'http://127.0.0.1:5001'
+# IPFS gateway for clients
+ipfs_gateway_url: 'https://ipfs.io'
diff --git a/contracts/Collectible.json b/contracts/Collectible.json
new file mode 100644
index 0000000..eebb10a
--- /dev/null
+++ b/contracts/Collectible.json
@@ -0,0 +1,433 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "Collectible",
+  "sourceName": "contracts/Collectible.sol",
+  "abi": [
+    {
+      "inputs": [
+        {
+          "internalType": "string",
+          "name": "name",
+          "type": "string"
+        },
+        {
+          "internalType": "string",
+          "name": "symbol",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "constructor"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "approved",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "Approval",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "operator",
+          "type": "address"
+        },
+        {
+          "indexed": false,
+          "internalType": "bool",
+          "name": "approved",
+          "type": "bool"
+        }
+      ],
+      "name": "ApprovalForAll",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "previousOwner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "OwnershipTransferred",
+      "type": "event"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "Transfer",
+      "type": "event"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "approve",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        }
+      ],
+      "name": "balanceOf",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "getApproved",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "owner",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "operator",
+          "type": "address"
+        }
+      ],
+      "name": "isApprovedForAll",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "internalType": "string",
+          "name": "tokenURI",
+          "type": "string"
+        }
+      ],
+      "name": "mint",
+      "outputs": [
+        {
+          "internalType": "uint256",
+          "name": "",
+          "type": "uint256"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "name",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "owner",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "ownerOf",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "renounceOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "safeTransferFrom",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        },
+        {
+          "internalType": "bytes",
+          "name": "_data",
+          "type": "bytes"
+        }
+      ],
+      "name": "safeTransferFrom",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "operator",
+          "type": "address"
+        },
+        {
+          "internalType": "bool",
+          "name": "approved",
+          "type": "bool"
+        }
+      ],
+      "name": "setApprovalForAll",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "bytes4",
+          "name": "interfaceId",
+          "type": "bytes4"
+        }
+      ],
+      "name": "supportsInterface",
+      "outputs": [
+        {
+          "internalType": "bool",
+          "name": "",
+          "type": "bool"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "symbol",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "tokenURI",
+      "outputs": [
+        {
+          "internalType": "string",
+          "name": "",
+          "type": "string"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "from",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        },
+        {
+          "internalType": "uint256",
+          "name": "tokenId",
+          "type": "uint256"
+        }
+      ],
+      "name": "transferFrom",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "transferOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
+  "bytecode": 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+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/contracts/Minter.json b/contracts/Minter.json
new file mode 100644
index 0000000..06acc74
--- /dev/null
+++ b/contracts/Minter.json
@@ -0,0 +1,151 @@
+{
+  "_format": "hh-sol-artifact-1",
+  "contractName": "Minter",
+  "sourceName": "contracts/Minter.sol",
+  "abi": [
+    {
+      "inputs": [
+        {
+          "internalType": "contract Collectible",
+          "name": "token_",
+          "type": "address"
+        },
+        {
+          "internalType": "address",
+          "name": "authority_",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "nonpayable",
+      "type": "constructor"
+    },
+    {
+      "anonymous": false,
+      "inputs": [
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "previousOwner",
+          "type": "address"
+        },
+        {
+          "indexed": true,
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "OwnershipTransferred",
+      "type": "event"
+    },
+    {
+      "inputs": [],
+      "name": "authority",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "user",
+          "type": "address"
+        },
+        {
+          "internalType": "string",
+          "name": "tokenURI",
+          "type": "string"
+        },
+        {
+          "internalType": "uint8",
+          "name": "v",
+          "type": "uint8"
+        },
+        {
+          "internalType": "bytes32",
+          "name": "r",
+          "type": "bytes32"
+        },
+        {
+          "internalType": "bytes32",
+          "name": "s",
+          "type": "bytes32"
+        }
+      ],
+      "name": "mint",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "owner",
+      "outputs": [
+        {
+          "internalType": "address",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "renounceOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [],
+      "name": "token",
+      "outputs": [
+        {
+          "internalType": "contract Collectible",
+          "name": "",
+          "type": "address"
+        }
+      ],
+      "stateMutability": "view",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+      ],
+      "name": "transferOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    },
+    {
+      "inputs": [
+        {
+          "internalType": "address",
+          "name": "to",
+          "type": "address"
+        }
+      ],
+      "name": "transferTokenOwnership",
+      "outputs": [],
+      "stateMutability": "nonpayable",
+      "type": "function"
+    }
+  ],
+  "bytecode": 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+  "linkReferences": {},
+  "deployedLinkReferences": {}
+}
diff --git a/docker-compose.yaml b/docker-compose.yaml
new file mode 100644
index 0000000..c77852f
--- /dev/null
+++ b/docker-compose.yaml
@@ -0,0 +1,17 @@
+version: "3"
+
+services:
+  database:
+    image: postgres:latest
+    restart: always
+    environment:
+      POSTGRES_PASSWORD: mitra
+      POSTGRES_USER: mitra
+      POSTGRES_DB: mitra
+    ports:
+      - "5432:5432"
+    volumes:
+      - mitra_postgres:/var/lib/postgresql/data
+  
+volumes:
+  mitra_postgres:
diff --git a/migrations/V0001__create_tables.sql b/migrations/V0001__create_tables.sql
new file mode 100644
index 0000000..66ac352
--- /dev/null
+++ b/migrations/V0001__create_tables.sql
@@ -0,0 +1,62 @@
+CREATE TABLE actor_profile (
+    id UUID PRIMARY KEY,
+    username VARCHAR(100) NOT NULL,
+    display_name VARCHAR(100),
+    acct VARCHAR(200) UNIQUE NOT NULL,
+    bio TEXT,
+    bio_source TEXT,
+    avatar_file_name VARCHAR(100),
+    banner_file_name VARCHAR(100),
+    follower_count INTEGER NOT NULL CHECK (follower_count >= 0) DEFAULT 0,
+    following_count INTEGER NOT NULL CHECK (following_count >= 0) DEFAULT 0,
+    post_count INTEGER NOT NULL CHECK (post_count >= 0) DEFAULT 0,
+    actor_json JSONB,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+CREATE TABLE user_invite_code (
+    code VARCHAR(100) PRIMARY KEY,
+    used BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+CREATE TABLE user_account (
+    id UUID PRIMARY KEY REFERENCES actor_profile (id) ON DELETE CASCADE,
+    wallet_address VARCHAR(100) UNIQUE NOT NULL,
+    password_hash VARCHAR(200) NOT NULL,
+    private_key TEXT NOT NULL,
+    invite_code VARCHAR(100) UNIQUE REFERENCES user_invite_code (code) ON DELETE SET NULL,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+CREATE TABLE post (
+    id UUID PRIMARY KEY,
+    author_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    content TEXT NOT NULL,
+    ipfs_cid VARCHAR(200),
+    token_id INTEGER,
+    token_tx_id VARCHAR(200),
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+CREATE TABLE relationship (
+    source_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    target_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    PRIMARY KEY (source_id, target_id)
+);
+
+CREATE TABLE follow_request (
+    id UUID PRIMARY KEY,
+    source_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    target_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    request_status SMALLINT NOT NULL,
+    UNIQUE (source_id, target_id)
+);
+
+CREATE TABLE media_attachment (
+    id UUID PRIMARY KEY,
+    owner_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    media_type VARCHAR(50),
+    file_name VARCHAR(200) NOT NULL,
+    post_id UUID REFERENCES post (id) ON DELETE CASCADE,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+)
diff --git a/migrations/schema.sql b/migrations/schema.sql
new file mode 100644
index 0000000..66ac352
--- /dev/null
+++ b/migrations/schema.sql
@@ -0,0 +1,62 @@
+CREATE TABLE actor_profile (
+    id UUID PRIMARY KEY,
+    username VARCHAR(100) NOT NULL,
+    display_name VARCHAR(100),
+    acct VARCHAR(200) UNIQUE NOT NULL,
+    bio TEXT,
+    bio_source TEXT,
+    avatar_file_name VARCHAR(100),
+    banner_file_name VARCHAR(100),
+    follower_count INTEGER NOT NULL CHECK (follower_count >= 0) DEFAULT 0,
+    following_count INTEGER NOT NULL CHECK (following_count >= 0) DEFAULT 0,
+    post_count INTEGER NOT NULL CHECK (post_count >= 0) DEFAULT 0,
+    actor_json JSONB,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+CREATE TABLE user_invite_code (
+    code VARCHAR(100) PRIMARY KEY,
+    used BOOLEAN NOT NULL DEFAULT FALSE
+);
+
+CREATE TABLE user_account (
+    id UUID PRIMARY KEY REFERENCES actor_profile (id) ON DELETE CASCADE,
+    wallet_address VARCHAR(100) UNIQUE NOT NULL,
+    password_hash VARCHAR(200) NOT NULL,
+    private_key TEXT NOT NULL,
+    invite_code VARCHAR(100) UNIQUE REFERENCES user_invite_code (code) ON DELETE SET NULL,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+CREATE TABLE post (
+    id UUID PRIMARY KEY,
+    author_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    content TEXT NOT NULL,
+    ipfs_cid VARCHAR(200),
+    token_id INTEGER,
+    token_tx_id VARCHAR(200),
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+CREATE TABLE relationship (
+    source_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    target_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    PRIMARY KEY (source_id, target_id)
+);
+
+CREATE TABLE follow_request (
+    id UUID PRIMARY KEY,
+    source_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    target_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    request_status SMALLINT NOT NULL,
+    UNIQUE (source_id, target_id)
+);
+
+CREATE TABLE media_attachment (
+    id UUID PRIMARY KEY,
+    owner_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
+    media_type VARCHAR(50),
+    file_name VARCHAR(200) NOT NULL,
+    post_id UUID REFERENCES post (id) ON DELETE CASCADE,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+)
diff --git a/src/activitypub/activity.rs b/src/activitypub/activity.rs
new file mode 100644
index 0000000..fc97158
--- /dev/null
+++ b/src/activitypub/activity.rs
@@ -0,0 +1,263 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use serde_json::{json, Value};
+use uuid::Uuid;
+
+use crate::config::Config;
+use crate::models::posts::types::Post;
+use crate::models::profiles::types::DbActorProfile;
+use crate::utils::files::get_file_url;
+use super::constants::{AP_CONTEXT, AP_PUBLIC};
+use super::views::{get_actor_url, get_object_url};
+use super::vocabulary::*;
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Attachment {
+    pub name: String,
+
+    #[serde(rename = "type")]
+    pub attachment_type: String,
+
+    pub media_type: String,
+    pub url: String,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Object {
+    #[serde(rename = "@context")]
+    pub context: Option<Value>,
+
+    pub id: String,
+
+    #[serde(rename = "type")]
+    pub object_type: String,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub actor: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub attachment: Option<Vec<Attachment>>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub object: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub published: Option<DateTime<Utc>>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub attributed_to: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub in_reply_to: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub content: Option<String>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub to: Option<Value>,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Activity {
+    #[serde(rename = "@context")]
+    pub context: Value,
+
+    pub id: String,
+    
+    #[serde(rename = "type")]
+    pub activity_type: String,
+
+    pub actor: String,
+    pub object: Value,
+}
+
+fn create_activity(
+    instance_url: &str,
+    actor_name: &str,
+    activity_type: &str,
+    activity_uuid: Option<Uuid>,
+    object: Value,
+) -> Activity {
+    let actor_id = get_actor_url(
+        instance_url,
+        &actor_name,
+    );
+    let activity_id = get_object_url(
+        instance_url,
+        &activity_uuid.unwrap_or(Uuid::new_v4()),
+    );
+    let activity = Activity {
+        context: json!(AP_CONTEXT),
+        id: activity_id,
+        activity_type: activity_type.to_string(),
+        actor: actor_id,
+        object: object,
+    };
+    activity
+}
+
+pub fn create_activity_note(
+    config: &Config,
+    post: &Post,
+) -> Activity {
+    let object_id = get_object_url(
+        &config.instance_url(),
+        &post.id,
+    );
+    let actor_id = get_actor_url(
+        &config.instance_url(),
+        &post.author.username,
+    );
+    let attachments: Vec<Attachment> = post.attachments.iter().map(|db_item| {
+        let url = get_file_url(&config.instance_url(), &db_item.file_name);
+        let media_type = db_item.media_type.clone().unwrap_or("".to_string());
+        Attachment {
+            name: "".to_string(),
+            attachment_type: DOCUMENT.to_string(),
+            media_type,
+            url,
+        }
+    }).collect();
+    let object = Object {
+        context: Some(json!(AP_CONTEXT)),
+        id: object_id,
+        object_type: NOTE.to_string(),
+        actor: None,
+        attachment: Some(attachments),
+        object: None,
+        published: Some(post.created_at),
+        attributed_to: Some(actor_id.clone()),
+        in_reply_to: None,
+        content: Some(post.content.clone()),
+        to: Some(json!(AP_PUBLIC)),
+    };
+    let activity = create_activity(
+        &config.instance_url(),
+        &post.author.username,
+        CREATE,
+        None,
+        serde_json::to_value(object).unwrap(),
+    );
+    activity
+}
+
+pub fn create_activity_follow(
+    config: &Config,
+    actor_profile: &DbActorProfile,
+    follow_request_id: &Uuid,
+    target_id: &str,
+) -> Activity {
+    let object = Object {
+        context: Some(json!(AP_CONTEXT)),
+        id: target_id.to_owned(),
+        object_type: PERSON.to_string(),
+        actor: None,
+        attachment: None,
+        object: None,
+        published: None,
+        attributed_to: None,
+        in_reply_to: None,
+        content: None,
+        to: None,
+    };
+    let activity = create_activity(
+        &config.instance_url(),
+        &actor_profile.username,
+        FOLLOW,
+        Some(*follow_request_id),
+        serde_json::to_value(object).unwrap(),
+    );
+    activity
+}
+
+pub fn create_activity_accept_follow(
+    config: &Config,
+    actor_profile: &DbActorProfile,
+    follow_activity_id: &str,
+) -> Activity {
+    // TODO: use received activity as object
+    let object = Object {
+        context: Some(json!(AP_CONTEXT)),
+        id: follow_activity_id.to_string(),
+        object_type: FOLLOW.to_string(),
+        actor: None,
+        attachment: None,
+        object: None,
+        published: None,
+        attributed_to: None,
+        in_reply_to: None,
+        content: None,
+        to: None,
+    };
+    let activity = create_activity(
+        &config.instance_url(),
+        &actor_profile.username,
+        ACCEPT,
+        None,
+        serde_json::to_value(object).unwrap(),
+    );
+    activity
+}
+
+pub fn create_activity_undo_follow(
+    config: &Config,
+    actor_profile: &DbActorProfile,
+    follow_request_id: &Uuid,
+    target_id: &str,
+) -> Activity {
+    // TODO: retrieve 'Follow' activity from database
+    let follow_activity_id = get_object_url(
+        &config.instance_url(),
+        follow_request_id,
+    );
+    let follow_actor_id = get_actor_url(
+        &config.instance_url(),
+        &actor_profile.username,
+    );
+    let object = Object {
+        context: Some(json!(AP_CONTEXT)),
+        id: follow_activity_id,
+        object_type: FOLLOW.to_string(),
+        actor: Some(follow_actor_id),
+        attachment: None,
+        object: Some(target_id.to_owned()),
+        published: None,
+        attributed_to: None,
+        in_reply_to: None,
+        content: None,
+        to: None,
+    };
+    let activity = create_activity(
+        &config.instance_url(),
+        &actor_profile.username,
+        UNDO,
+        None,
+        serde_json::to_value(object).unwrap(),
+    );
+    activity
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct OrderedCollection {
+    #[serde(rename = "@context")]
+    pub context: Value,
+
+    pub id: String,
+
+    #[serde(rename = "type")]
+    pub object_type: String,
+}
+
+impl OrderedCollection {
+    pub fn new(collection_url: String) -> Self {
+        Self {
+            context: json!(AP_CONTEXT),
+            id: collection_url,
+            object_type: "OrderedCollection".to_string(),
+        }
+    }
+}
diff --git a/src/activitypub/actor.rs b/src/activitypub/actor.rs
new file mode 100644
index 0000000..1fa786f
--- /dev/null
+++ b/src/activitypub/actor.rs
@@ -0,0 +1,139 @@
+use serde::{Deserialize, Serialize};
+use serde_json::{json, Value};
+
+use crate::config::Config;
+use crate::errors::HttpError;
+use crate::models::users::types::User;
+use crate::utils::crypto::{deserialize_private_key, get_public_key_pem};
+use crate::utils::files::get_file_url;
+use super::constants::AP_CONTEXT;
+use super::views::{
+    get_actor_url,
+    get_inbox_url,
+    get_outbox_url,
+    get_followers_url,
+    get_following_url,
+};
+use super::vocabulary::{PERSON, IMAGE};
+
+const W3ID_CONTEXT: &str = "https://w3id.org/security/v1";
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PublicKey {
+    id: String,
+    owner: String,
+    pub public_key_pem: String,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Image {
+    #[serde(rename = "type")]
+    object_type: String,
+    pub url: String,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ActorCapabilities {
+    accepts_chat_messages: Option<bool>,
+}
+
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Actor {
+    #[serde(rename = "@context")]
+    context: Option<Value>,
+
+    pub id: String,
+
+    #[serde(rename = "type")]
+    object_type: String,
+
+    pub name: String,
+    pub preferred_username: String,
+    pub inbox: String,
+    pub outbox: String,
+    pub followers: String,
+    pub following: String,
+
+    pub public_key: PublicKey,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub capabilities: Option<ActorCapabilities>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub icon: Option<Image>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub image: Option<Image>,
+
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub summary: Option<String>,
+}
+
+pub fn get_actor_object(
+    config: &Config,
+    user: &User,
+) -> Result<Actor, HttpError> {
+    let username = &user.profile.username;
+    let id = get_actor_url(&config.instance_url(), &username);
+    let inbox = get_inbox_url(&config.instance_url(), &username);
+    let outbox = get_outbox_url(&config.instance_url(), &username);
+    let followers = get_followers_url(&config.instance_url(), &username);
+    let following = get_following_url(&config.instance_url(), &username);
+
+    let private_key = deserialize_private_key(&user.private_key)
+        .map_err(|_| HttpError::InternalError)?;
+    let public_key_pem = get_public_key_pem(&private_key)
+        .map_err(|_| HttpError::InternalError)?;
+    let public_key = PublicKey {
+        id: format!("{}#main-key", id),
+        owner: id.clone(),
+        public_key_pem: public_key_pem,
+    };
+    let avatar = match &user.profile.avatar_file_name {
+        Some(file_name) => {
+            let image = Image {
+                object_type: IMAGE.to_string(),
+                url: get_file_url(&config.instance_url(), file_name),
+            };
+            Some(image)
+        },
+        None => None,
+    };
+    let banner = match &user.profile.banner_file_name {
+        Some(file_name) => {
+            let image = Image {
+                object_type: IMAGE.to_string(),
+                url: get_file_url(&config.instance_url(), file_name),
+            };
+            Some(image)
+        },
+        None => None,
+    };
+    let capabilities = ActorCapabilities {
+        accepts_chat_messages: Some(false),
+    };
+    let actor = Actor {
+        context: Some(json!([
+            AP_CONTEXT.to_string(),
+            W3ID_CONTEXT.to_string(),
+        ])),
+        id,
+        object_type: PERSON.to_string(),
+        name: username.to_string(),
+        preferred_username: username.to_string(),
+        inbox,
+        outbox,
+        followers,
+        following,
+        public_key,
+        capabilities: Some(capabilities),
+        icon: avatar,
+        image: banner,
+        summary: None,
+    };
+    Ok(actor)
+}
diff --git a/src/activitypub/constants.rs b/src/activitypub/constants.rs
new file mode 100644
index 0000000..d94d885
--- /dev/null
+++ b/src/activitypub/constants.rs
@@ -0,0 +1,3 @@
+pub const ACTIVITY_CONTENT_TYPE: &str = "application/activity+json";
+pub const AP_CONTEXT: &str = "https://www.w3.org/ns/activitystreams";
+pub const AP_PUBLIC: &str = "https://www.w3.org/ns/activitystreams#Public";
diff --git a/src/activitypub/deliverer.rs b/src/activitypub/deliverer.rs
new file mode 100644
index 0000000..165a8ce
--- /dev/null
+++ b/src/activitypub/deliverer.rs
@@ -0,0 +1,97 @@
+use crate::config::{Environment, Config};
+use crate::http_signatures::create::{create_http_signature, SignatureError};
+use crate::models::users::types::User;
+use crate::utils::crypto::deserialize_private_key;
+use super::activity::Activity;
+use super::actor::Actor;
+use super::constants::ACTIVITY_CONTENT_TYPE;
+use super::views::get_actor_url;
+
+#[derive(thiserror::Error, Debug)]
+pub enum DelivererError {
+    #[error("key error")]
+    KeyDeserializationError(#[from] rsa::pkcs8::Error),
+
+    #[error(transparent)]
+    SignatureError(#[from] SignatureError),
+
+    #[error("activity serialization error")]
+    SerializationError(#[from] serde_json::Error),
+
+    #[error(transparent)]
+    RequestError(#[from] reqwest::Error),
+
+    #[error("http error {0:?}")]
+    HttpError(reqwest::StatusCode),
+}
+
+async fn send_activity(
+    config: &Config,
+    sender: &User,
+    activity: &Activity,
+    inbox_url: &str,
+) -> Result<(), DelivererError> {
+    let activity_json = serde_json::to_string(&activity)?;
+    log::info!("sending activity: {}", activity_json);
+    let actor_key = deserialize_private_key(&sender.private_key)?;
+    let actor_key_id = format!(
+        "{}#main-key",
+        get_actor_url(
+            &config.instance_url(),
+            &sender.profile.username,
+        ),
+    );
+    let headers = create_http_signature(
+        &inbox_url,
+        &activity_json,
+        actor_key,
+        actor_key_id,
+    )?;
+
+    // Send
+    match config.environment {
+        Environment::Development => {
+            log::info!(
+                "development mode: not sending activity to {}",
+                inbox_url,
+            );
+        },
+        Environment::Production => {
+            let client = reqwest::Client::new();
+            // Default timeout is 30s
+            let response = client.post(inbox_url)
+                .header("Host", headers.host)
+                .header("Date", headers.date)
+                .header("Digest", headers.digest)
+                .header("Signature", headers.signature)
+                .header("Content-Type", ACTIVITY_CONTENT_TYPE)
+                .body(activity_json)
+                .send()
+                .await?;
+            let response_status = response.status();
+            let response_text = response.text().await?;
+            log::info!(
+                "remote server response: {}",
+                response_text,
+            );
+            if response_status.is_client_error() || response_status.is_server_error() {
+                return Err(DelivererError::HttpError(response_status));
+            }
+        },
+    };
+    Ok(())
+}
+
+pub async fn deliver_activity(
+    config: &Config,
+    sender: &User,
+    activity: Activity,
+    recipients: Vec<Actor>,
+) -> () {
+    for actor in recipients {
+        // TODO: retry on error
+        if let Err(err) = send_activity(&config, &sender, &activity, &actor.inbox).await {
+            log::error!("{}", err);
+        }
+    };
+}
diff --git a/src/activitypub/fetcher.rs b/src/activitypub/fetcher.rs
new file mode 100644
index 0000000..b5fae86
--- /dev/null
+++ b/src/activitypub/fetcher.rs
@@ -0,0 +1,120 @@
+use std::path::PathBuf;
+
+use serde_json::Value;
+
+use crate::models::profiles::types::ProfileCreateData;
+use crate::utils::files::{save_file, FileError};
+use crate::webfinger::types::JsonResourceDescriptor;
+use super::actor::Actor;
+use super::constants::ACTIVITY_CONTENT_TYPE;
+
+#[derive(thiserror::Error, Debug)]
+pub enum FetchError {
+    #[error("invalid URL")]
+    UrlError(#[from] url::ParseError),
+
+    #[error(transparent)]
+    RequestError(#[from] reqwest::Error),
+
+    #[error("json parse error")]
+    JsonParseError(#[from] serde_json::Error),
+
+    #[error("file error")]
+    FileError(#[from] FileError),
+
+    #[error("{0}")]
+    OtherError(&'static str),
+}
+
+pub async fn fetch_avatar_and_banner(
+    actor: &Actor,
+    media_dir: &PathBuf,
+) -> Result<(Option<String>, Option<String>), FetchError> {
+    let avatar = match &actor.icon {
+        Some(icon) => {
+            let file_name = fetch_attachment(
+                &icon.url,
+                media_dir,
+            ).await?;
+            Some(file_name)
+        },
+        None => None,
+    };
+    let banner = match &actor.image {
+        Some(image) => {
+            let file_name = fetch_attachment(
+                &image.url,
+                media_dir,
+            ).await?;
+            Some(file_name)
+        },
+        None => None,
+    };
+    Ok((avatar, banner))
+}
+
+pub async fn fetch_profile(
+    username: &str,
+    instance_uri: &str,
+    media_dir: &PathBuf,
+) -> Result<ProfileCreateData, FetchError> {
+    let actor_address = format!("{}@{}", &username, &instance_uri);
+    let webfinger_account_uri = format!("acct:{}", actor_address);
+    // TOOD: support http
+    let webfinger_url = format!("https://{}/.well-known/webfinger", instance_uri);
+    let client = reqwest::Client::new();
+    let webfinger_data = client.get(&webfinger_url)
+        .query(&[("resource", webfinger_account_uri)])
+        .send().await?
+        .text().await?;
+    let jrd: JsonResourceDescriptor = serde_json::from_str(&webfinger_data)?;
+    let link = jrd.links.iter()
+        .find(|link| link.rel == "self")
+        .ok_or(FetchError::OtherError("self link not found"))?;
+    let actor_url = link.href.as_ref()
+        .ok_or(FetchError::OtherError("account href not found"))?;
+    fetch_profile_by_actor_id(actor_url, media_dir).await
+}
+
+pub async fn fetch_profile_by_actor_id(
+    actor_url: &str,
+    media_dir: &PathBuf,
+) -> Result<ProfileCreateData, FetchError> {
+    let actor_host = url::Url::parse(actor_url)?
+        .host_str()
+        .ok_or(FetchError::OtherError("invalid URL"))?
+        .to_owned();
+    let client = reqwest::Client::new();
+    let actor_json = client.get(actor_url)
+        .header(reqwest::header::ACCEPT, ACTIVITY_CONTENT_TYPE)
+        .send().await?
+        .text().await?;
+    let actor_value: Value = serde_json::from_str(&actor_json)?;
+    let actor: Actor = serde_json::from_value(actor_value.clone())?;
+    let (avatar, banner) = fetch_avatar_and_banner(&actor, media_dir).await?;
+    let actor_address = format!(
+        "{}@{}",
+        actor.preferred_username,
+        actor_host,
+    );
+    let profile_data = ProfileCreateData {
+        username: actor.preferred_username,
+        display_name: Some(actor.name),
+        acct: actor_address,
+        bio: actor.summary,
+        avatar: avatar,
+        banner: banner,
+        actor: Some(actor_value),
+    };
+    Ok(profile_data)
+}
+
+pub async fn fetch_attachment(
+    url: &str,
+    output_dir: &PathBuf,
+) -> Result<String, FetchError> {
+    let response = reqwest::get(url).await?;
+    let file_data = response.bytes().await?;
+    let file_name = save_file(file_data.to_vec(), output_dir)?;
+    Ok(file_name)
+}
diff --git a/src/activitypub/mod.rs b/src/activitypub/mod.rs
new file mode 100644
index 0000000..cabadb7
--- /dev/null
+++ b/src/activitypub/mod.rs
@@ -0,0 +1,8 @@
+pub mod activity;
+pub mod actor;
+pub mod constants;
+pub mod deliverer;
+pub mod fetcher;
+mod receiver;
+pub mod views;
+mod vocabulary;
diff --git a/src/activitypub/receiver.rs b/src/activitypub/receiver.rs
new file mode 100644
index 0000000..3809b98
--- /dev/null
+++ b/src/activitypub/receiver.rs
@@ -0,0 +1,210 @@
+use regex::Regex;
+use serde_json::Value;
+use uuid::Uuid;
+
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::{HttpError, ValidationError};
+use crate::models::attachments::queries::create_attachment;
+use crate::models::posts::types::PostCreateData;
+use crate::models::posts::queries::create_post;
+use crate::models::profiles::queries::{
+    get_profile_by_actor_id,
+    get_profile_by_acct,
+    update_profile,
+};
+use crate::models::profiles::types::ProfileUpdateData;
+use crate::models::relationships::queries::{accept_follow_request, follow, unfollow};
+use crate::models::users::queries::get_user_by_id;
+use super::activity::{Object, Activity, create_activity_accept_follow};
+use super::actor::Actor;
+use super::deliverer::deliver_activity;
+use super::fetcher::{fetch_avatar_and_banner, fetch_attachment};
+use super::vocabulary::*;
+
+fn parse_actor_id(actor_id: &str) -> Result<String, ValidationError> {
+    let url_regexp = Regex::new(r"^https?://.+/users/(?P<username>[0-9a-z_]+)$").unwrap();
+    let url_caps = url_regexp.captures(&actor_id)
+        .ok_or(ValidationError("invalid actor ID"))?;
+    let username = url_caps.name("username")
+        .ok_or(ValidationError("invalid actor ID"))?
+        .as_str()
+        .to_owned();
+    Ok(username)
+}
+
+fn parse_object_id(object_id: &str) -> Result<Uuid, ValidationError> {
+    let url_regexp = Regex::new(r"^https?://.+/objects/(?P<uuid>[0-9a-f-]+)$").unwrap();
+    let url_caps = url_regexp.captures(&object_id)
+        .ok_or(ValidationError("invalid object ID"))?;
+    let object_uuid: Uuid = url_caps.name("uuid")
+        .ok_or(ValidationError("invalid object ID"))?
+        .as_str().parse()
+        .map_err(|_| ValidationError("invalid object ID"))?;
+    Ok(object_uuid)
+}
+
+pub async fn receive_activity(
+    config: &Config,
+    db_pool: &Pool,
+    _username: String,
+    activity_raw: Value,
+) -> Result<(), HttpError> {
+    let activity: Activity = serde_json::from_value(activity_raw)
+        .map_err(|_| ValidationError("invalid activity"))?;
+    let activity_type = activity.activity_type;
+    let object_type = activity.object.get("type")
+        .and_then(|val| val.as_str())
+        .unwrap_or("Unknown")
+        .to_owned();
+    let db_client = &mut **get_database_client(&db_pool).await?;
+    match (activity_type.as_str(), object_type.as_str()) {
+        (ACCEPT, FOLLOW) => {
+            let object: Object = serde_json::from_value(activity.object)
+                .map_err(|_| ValidationError("invalid object"))?;
+            // TODO: reject if object ID contains wrong instance URI
+            let follow_request_id = parse_object_id(&object.id)?;
+            accept_follow_request(db_client, &follow_request_id).await?;
+        },
+        (CREATE, NOTE) => {
+            let object: Object = serde_json::from_value(activity.object)
+                .map_err(|_| ValidationError("invalid object"))?;
+            let attributed_to = object.attributed_to
+                .ok_or(ValidationError("unattributed note"))?;
+            let author = get_profile_by_actor_id(db_client, &attributed_to).await?;
+            let content = object.content
+                .ok_or(ValidationError("no content"))?;
+            let mut attachments: Vec<Uuid> = Vec::new();
+            if let Some(list) = object.attachment {
+                let mut downloaded: Vec<(String, String)> = Vec::new();
+                let output_dir = config.media_dir();
+                for attachment in list {
+                    let file_name = fetch_attachment(&attachment.url, &output_dir).await
+                        .map_err(|_| ValidationError("failed to fetch attachment"))?;
+                    log::info!("downloaded attachment {}", attachment.url);
+                    downloaded.push((file_name, attachment.media_type));
+                }
+                for (file_name, media_type) in downloaded {
+                    let db_attachment = create_attachment(
+                        db_client,
+                        &author.id,
+                        Some(media_type),
+                        file_name,
+                    ).await?;
+                    attachments.push(db_attachment.id);
+                }
+            }
+            let post_data = PostCreateData {
+                content,
+                attachments: attachments,
+                created_at: object.published,
+            };
+            create_post(db_client, &author.id, post_data).await?;
+        },
+        (FOLLOW, _) => {
+            let source_profile = get_profile_by_actor_id(db_client, &activity.actor).await?;
+            let source_actor_value = source_profile.actor_json.ok_or(HttpError::InternalError)?;
+            let source_actor: Actor = serde_json::from_value(source_actor_value)
+                .map_err(|_| HttpError::InternalError)?;
+            let target_actor_id = activity.object.as_str()
+                .ok_or(ValidationError("invalid object"))?;
+            // TODO: reject if object ID contains wrong instance URI
+            let target_username = parse_actor_id(&target_actor_id)?;
+            let target_profile = get_profile_by_acct(db_client, &target_username).await?;
+            // Create and send 'Accept' activity
+            let target_user = get_user_by_id(db_client, &target_profile.id).await?;
+            let new_activity = create_activity_accept_follow(&config, &target_profile, &activity.id);
+            // Save relationship
+            follow(db_client, &source_profile.id, &target_profile.id).await?;
+
+            // Send activity
+            let recipients = vec![source_actor];
+            let config_clone = config.clone();
+            actix_rt::spawn(async move {
+                deliver_activity(
+                    &config_clone,
+                    &target_user,
+                    new_activity,
+                    recipients,
+                ).await;
+            });
+        },
+        (UNDO, FOLLOW) => {
+            let object: Object = serde_json::from_value(activity.object)
+                .map_err(|_| ValidationError("invalid object"))?;
+            let source_profile = get_profile_by_actor_id(db_client, &activity.actor).await?;
+            let target_actor_id = object.object
+                .ok_or(ValidationError("invalid object"))?;
+            // TODO: reject if actor ID contains wrong instance URI
+            let target_username = parse_actor_id(&target_actor_id)?;
+            let target_profile = get_profile_by_acct(db_client, &target_username).await?;
+            unfollow(db_client, &source_profile.id, &target_profile.id).await?;
+        },
+        (UPDATE, PERSON) => {
+            let actor: Actor = serde_json::from_value(activity.object)
+                .map_err(|_| ValidationError("invalid actor data"))?;
+            let profile = get_profile_by_actor_id(db_client, &actor.id).await?;
+            let (avatar, banner) = fetch_avatar_and_banner(&actor, &config.media_dir()).await
+                .map_err(|_| ValidationError("failed to fetch image"))?;
+            let mut profile_data = ProfileUpdateData {
+                display_name: Some(actor.name),
+                bio: actor.summary.clone(),
+                bio_source: actor.summary,
+                avatar,
+                banner,
+            };
+            profile_data.clean()?;
+            update_profile(db_client, &profile.id, profile_data).await?;
+        },
+        _ => {
+            return Err(HttpError::ValidationError("activity type is not supported".into()));
+        },
+    };
+    log::info!(
+        "processed {}({}) from {}",
+        activity_type,
+        object_type,
+        activity.actor,
+    );
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_actor_id() {
+        let username = parse_actor_id("https://example.org/users/test").unwrap();
+        assert_eq!(username, "test".to_string());
+    }
+
+    #[test]
+    fn test_parse_actor_id_wrong_path() {
+        let error = parse_actor_id("https://example.org/user/test").unwrap_err();
+        assert_eq!(error.to_string(), "invalid actor ID");
+    }
+
+    #[test]
+    fn test_parse_actor_id_invalid_username() {
+        let error = parse_actor_id("https://example.org/users/tes-t").unwrap_err();
+        assert_eq!(error.to_string(), "invalid actor ID");
+    }
+
+    #[test]
+    fn test_parse_object_id() {
+        let expected_uuid = Uuid::new_v4();
+        let object_id = format!(
+            "https://example.org/objects/{}",
+            expected_uuid,
+        );
+        let object_uuid = parse_object_id(&object_id).unwrap();
+        assert_eq!(object_uuid, expected_uuid);
+    }
+
+    #[test]
+    fn test_parse_object_id_invalid_uuid() {
+        let error = parse_object_id("https://example.org/objects/1234").unwrap_err();
+        assert_eq!(error.to_string(), "invalid object ID");
+    }
+}
diff --git a/src/activitypub/views.rs b/src/activitypub/views.rs
new file mode 100644
index 0000000..d2a1f9c
--- /dev/null
+++ b/src/activitypub/views.rs
@@ -0,0 +1,129 @@
+use actix_web::{
+    get, post, web,
+    HttpRequest, HttpResponse, Scope,
+};
+use serde::Deserialize;
+use uuid::Uuid;
+
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::http_signatures::verify::verify_http_signature;
+use crate::models::users::queries::get_user_by_name;
+use super::activity::OrderedCollection;
+use super::actor::get_actor_object;
+use super::constants::ACTIVITY_CONTENT_TYPE;
+use super::receiver::receive_activity;
+
+pub fn get_actor_url(instance_url: &str, username: &str) -> String {
+    format!("{}/users/{}", instance_url, username)
+}
+
+pub fn get_inbox_url(instance_url: &str, username: &str) -> String {
+    format!("{}/users/{}/inbox", instance_url, username)
+}
+
+pub fn get_outbox_url(instance_url: &str, username: &str) -> String {
+    format!("{}/users/{}/outbox", instance_url, username)
+}
+
+pub fn get_followers_url(instance_url: &str, username: &str) -> String {
+    format!("{}/users/{}/followers", instance_url, username)
+}
+
+pub fn get_following_url(instance_url: &str, username: &str) -> String {
+    format!("{}/users/{}/following", instance_url, username)
+}
+
+pub fn get_object_url(instance_url: &str, object_uuid: &Uuid) -> String {
+    format!("{}/objects/{}", instance_url, object_uuid)
+}
+
+#[get("")]
+async fn get_actor(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    web::Path(username): web::Path<String>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let user = get_user_by_name(db_client, &username).await?;
+    let actor = get_actor_object(&config, &user)?;
+    let response = HttpResponse::Ok()
+        .content_type(ACTIVITY_CONTENT_TYPE)
+        .json(actor);
+    Ok(response)
+}
+
+#[post("/inbox")]
+async fn inbox(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    request: HttpRequest,
+    web::Path(username): web::Path<String>,
+    activity: web::Json<serde_json::Value>,
+) -> Result<HttpResponse, HttpError> {
+    log::info!("received to '{}' inbox: {}", username, activity);
+    if let Err(err) = verify_http_signature(&config, &db_pool, &request).await {
+        log::warn!("invalid signature: {}", err);
+    }
+    receive_activity(&config, &db_pool, username, activity.into_inner()).await?;
+    Ok(HttpResponse::Ok().body("success"))
+}
+
+#[derive(Deserialize)]
+struct CollectionQueryParams {
+    page: Option<i32>,
+}
+
+#[get("/followers")]
+async fn followers_collection(
+    config: web::Data<Config>,
+    web::Path(username): web::Path<String>,
+    query_params: web::Query<CollectionQueryParams>,
+) -> Result<HttpResponse, HttpError> {
+    if query_params.page.is_some() {
+        // Social graph is not available
+        return Err(HttpError::PermissionError);
+    }
+    let collection_url = get_followers_url(&config.instance_url(), &username);
+    let collection = OrderedCollection::new(collection_url);
+    let response = HttpResponse::Ok()
+        .content_type(ACTIVITY_CONTENT_TYPE)
+        .json(collection);
+    Ok(response)
+}
+
+#[get("/following")]
+async fn following_collection(
+    config: web::Data<Config>,
+    web::Path(username): web::Path<String>,
+    query_params: web::Query<CollectionQueryParams>,
+) -> Result<HttpResponse, HttpError> {
+    if query_params.page.is_some() {
+        // Social graph is not available
+        return Err(HttpError::PermissionError);
+    }
+    let collection_url = get_following_url(&config.instance_url(), &username);
+    let collection = OrderedCollection::new(collection_url);
+    let response = HttpResponse::Ok()
+        .content_type(ACTIVITY_CONTENT_TYPE)
+        .json(collection);
+    Ok(response)
+}
+
+pub fn activitypub_scope() -> Scope {
+    web::scope("/users/{username}")
+        .service(get_actor)
+        .service(inbox)
+        .service(followers_collection)
+        .service(following_collection)
+}
+
+#[get("/objects/{object_id}")]
+pub async fn get_object(
+    web::Path(_object_id): web::Path<String>,
+) -> Result<HttpResponse, HttpError> {
+    // WARNING: activities/objects are not stored
+    let response = HttpResponse::Gone().body("");
+    Ok(response)
+}
diff --git a/src/activitypub/vocabulary.rs b/src/activitypub/vocabulary.rs
new file mode 100644
index 0000000..a2409a6
--- /dev/null
+++ b/src/activitypub/vocabulary.rs
@@ -0,0 +1,14 @@
+// Activity types
+pub const ACCEPT: &str = "Accept";
+pub const CREATE: &str = "Create";
+pub const FOLLOW: &str = "Follow";
+pub const UNDO: &str = "Undo";
+pub const UPDATE: &str = "Update";
+
+// Actor types
+pub const PERSON: &str = "Person";
+
+// Object types
+pub const DOCUMENT: &str = "Document";
+pub const IMAGE: &str = "Image";
+pub const NOTE: &str = "Note";
diff --git a/src/bin/mitractl.rs b/src/bin/mitractl.rs
new file mode 100644
index 0000000..0a45c7c
--- /dev/null
+++ b/src/bin/mitractl.rs
@@ -0,0 +1,87 @@
+use clap::Clap;
+use tokio;
+use uuid::Uuid;
+
+use mitra::config;
+use mitra::database::{create_pool, get_database_client};
+use mitra::database::migrate::apply_migrations;
+use mitra::ethereum::utils::generate_ethereum_address;
+use mitra::logger::configure_logger;
+use mitra::models::profiles::queries as profiles;
+use mitra::models::users::queries::{
+    generate_invite_code,
+    get_invite_codes,
+};
+
+/// Admin CLI tool
+#[derive(Clap)]
+struct Opts {
+    #[clap(subcommand)]
+    subcmd: SubCommand,
+}
+
+#[derive(Clap)]
+enum SubCommand {
+    DeleteProfile(DeleteProfile),
+    GenerateInviteCode(GenerateInviteCode),
+    ListInviteCodes(ListInviteCodes),
+    GenerateEthereumAddress(GenerateEthereumAddress),
+}
+
+/// Delete profile
+#[derive(Clap)]
+struct DeleteProfile {
+    /// Print debug info
+    #[clap(short)]
+    id: Uuid,
+}
+
+/// Generate invite code
+#[derive(Clap)]
+struct GenerateInviteCode { }
+
+/// List invite codes
+#[derive(Clap)]
+struct ListInviteCodes { }
+
+/// Generate ethereum address
+#[derive(Clap)]
+struct GenerateEthereumAddress { }
+
+#[tokio::main]
+async fn main() {
+    let config = config::parse_config();
+    configure_logger();
+    let db_pool = create_pool(&config.database_url);
+    apply_migrations(&db_pool).await;
+    let db_client = get_database_client(&db_pool).await.unwrap();
+    let opts: Opts = Opts::parse();
+
+    match opts.subcmd {
+        SubCommand::DeleteProfile(subopts) => {
+            profiles::delete_profile(&**db_client, &subopts.id).await.unwrap();
+            println!("profile deleted");
+        },
+        SubCommand::GenerateInviteCode(_) => {
+            let invite_code = generate_invite_code(&**db_client).await.unwrap();
+            println!("generated invite code: {}", invite_code);
+        },
+        SubCommand::ListInviteCodes(_) => {
+            let invite_codes = get_invite_codes(&**db_client).await.unwrap();
+            if invite_codes.len() == 0 {
+                println!("no invite codes found");
+                return;
+            }
+            for code in invite_codes {
+                println!("{}", code);
+            }
+        },
+        SubCommand::GenerateEthereumAddress(_) => {
+            let (private_key, address) = generate_ethereum_address();
+            println!(
+                "address {:?}; private key {}",
+                address, private_key,
+            );
+        },
+    };
+}
diff --git a/src/config.rs b/src/config.rs
new file mode 100644
index 0000000..8e24d40
--- /dev/null
+++ b/src/config.rs
@@ -0,0 +1,159 @@
+use std::path::PathBuf;
+use std::str::FromStr;
+
+use serde::{de, Deserialize, Deserializer};
+use url::{Url, ParseError as UrlParseError};
+
+use crate::errors::ConversionError;
+
+#[derive(Clone, Debug)]
+pub enum Environment {
+    Development,
+    Production,
+}
+
+impl FromStr for Environment {
+    type Err = ConversionError;
+
+    fn from_str(val: &str) -> Result<Self, Self::Err> {
+        let environment = match val {
+            "development" => Environment::Development,
+            "production" => Environment::Production,
+            _ => return Err(ConversionError),
+        };
+        Ok(environment)
+    }
+}
+
+fn environment_from_str<'de, D>(deserializer: D) -> Result<Environment, D::Error>
+where
+    D: Deserializer<'de>,
+{
+    let s: String = Deserialize::deserialize(deserializer)?;
+    Environment::from_str(&s).map_err(de::Error::custom)
+}
+
+#[derive(Clone)]
+pub struct EnvConfig {
+    pub environment: Option<Environment>,
+    pub config_path: String,
+    pub crate_version: String,
+}
+
+fn parse_env() -> EnvConfig {
+    dotenv::from_filename(".env.local").ok();
+    dotenv::dotenv().ok();
+    let environment_str = std::env::var("ENVIRONMENT").ok();
+    let environment = environment_str
+        .map(|val| Environment::from_str(&val).expect("invalid environment type"));
+    let config_path = std::env::var("CONFIG_PATH")
+        .unwrap_or("config.yaml".to_string());
+    let crate_version = env!("CARGO_PKG_VERSION").to_string();
+    EnvConfig {
+        environment,
+        config_path,
+        crate_version,
+    }
+}
+
+fn default_environment() -> Environment { Environment::Development }
+
+fn default_storage_dir() -> PathBuf { PathBuf::from("files") }
+
+fn default_contract_dir() -> PathBuf { PathBuf::from("contracts") }
+
+fn default_cookie_name() -> String { "session".to_string() }
+
+#[derive(Clone, Deserialize)]
+pub struct EthereumContract {
+    pub address: String,
+    pub chain_id: u32,
+    pub signing_key: String,
+}
+
+#[derive(Clone, Deserialize)]
+pub struct Config {
+    #[serde(default = "default_environment")]
+    #[serde(deserialize_with = "environment_from_str")]
+    pub environment: Environment,
+
+    #[serde(skip)]
+    pub version: String,
+
+    // Core settings
+    pub database_url: String,
+
+    #[serde(default = "default_storage_dir")]
+    pub storage_dir: PathBuf,
+
+    pub http_host: String,
+    pub http_port: u32,
+
+    #[serde(default = "default_cookie_name")]
+    pub cookie_name: String,
+
+    pub cookie_secret_key: String,
+
+    // Instance info
+    pub instance_uri: String,
+    pub instance_title: String,
+    pub instance_short_description: String,
+    pub instance_description: String,
+
+    #[serde(default)]
+    pub registrations_open: bool, // default is false
+
+    pub login_message: String,
+
+    // Ethereum & IPFS
+    #[serde(default = "default_contract_dir")]
+    pub contract_dir: PathBuf,
+
+    pub ethereum_json_rpc_url: Option<String>,
+    pub ethereum_explorer_url: Option<String>,
+    pub ethereum_contract: Option<EthereumContract>,
+    pub ipfs_api_url: Option<String>,
+    pub ipfs_gateway_url: Option<String>,
+}
+
+impl Config {
+    fn try_instance_url(&self) -> Result<Url, UrlParseError> {
+        // TODO: allow http in production
+        let scheme = match self.environment {
+            Environment::Development => "http",
+            Environment::Production => "https",
+        };
+        let url_str = format!("{}://{}", scheme, self.instance_uri);
+        Url::parse(&url_str)
+    }
+
+    pub fn instance_url(&self) -> String {
+        self.try_instance_url().unwrap().origin().ascii_serialization()
+    }
+
+    pub fn media_dir(&self) -> PathBuf {
+        self.storage_dir.join("media")
+    }
+}
+
+pub fn parse_config() -> Config {
+    let env = parse_env();
+    let config_yaml = std::fs::read_to_string(env.config_path)
+        .expect("failed to load config file");
+    let mut config = serde_yaml::from_str::<Config>(&config_yaml)
+        .expect("invalid yaml data");
+    // Override environment parameter in config if env variable is set
+    config.environment = env.environment.unwrap_or(config.environment);
+    // Set_version
+    config.version = env.crate_version;
+    // Validate config
+    if !config.storage_dir.exists() {
+        panic!("storage_dir does not exist");
+    };
+    if !config.contract_dir.exists() {
+        panic!("contract directory does not exist");
+    };
+    config.try_instance_url().expect("invalid instance URI");
+
+    config
+}
diff --git a/src/database/migrate.rs b/src/database/migrate.rs
new file mode 100644
index 0000000..49a803b
--- /dev/null
+++ b/src/database/migrate.rs
@@ -0,0 +1,23 @@
+use crate::database::Pool;
+
+mod embedded {
+    use refinery::embed_migrations;
+    embed_migrations!("migrations");
+}
+
+pub async fn apply_migrations(pool: &Pool) {
+    // https://github.com/rust-db/refinery/issues/105
+    let mut client_object = pool.get().await.unwrap();
+    let client = &mut *(*client_object);
+    let migration_report = embedded::migrations::runner()
+        .run_async(client)
+        .await.unwrap();
+
+    for migration in migration_report.applied_migrations() {
+        log::info!(
+            "Migration Applied -  Name: {}, Version: {}",
+            migration.name(),
+            migration.version(),
+        );
+    }
+}
diff --git a/src/database/mod.rs b/src/database/mod.rs
new file mode 100644
index 0000000..888779b
--- /dev/null
+++ b/src/database/mod.rs
@@ -0,0 +1,26 @@
+pub mod migrate;
+
+pub type Pool = deadpool_postgres::Pool;
+
+pub fn create_pool(database_url: &str) -> Pool {
+    let pool = deadpool_postgres::Pool::new(
+        deadpool_postgres::Manager::new(
+            database_url.parse().expect("invalid database URL"),
+            tokio_postgres::NoTls,
+        ),
+        // https://wiki.postgresql.org/wiki/Number_Of_Database_Connections
+        num_cpus::get() * 2,
+    );
+    pool
+}
+
+use crate::errors::DatabaseError;
+
+pub async fn get_database_client(pool: &Pool)
+    -> Result<deadpool_postgres::Client, DatabaseError>
+{
+    // Returns wrapped client
+    // https://github.com/bikeshedder/deadpool/issues/56
+    let client = pool.get().await?;
+    Ok(client)
+}
diff --git a/src/errors.rs b/src/errors.rs
new file mode 100644
index 0000000..583e3ab
--- /dev/null
+++ b/src/errors.rs
@@ -0,0 +1,100 @@
+use actix_web::{
+    dev::HttpResponseBuilder,
+    http::StatusCode,
+    HttpResponse,
+    error::ResponseError,
+};
+use serde::Serialize;
+
+#[derive(thiserror::Error, Debug)]
+#[error("conversion error")]
+pub struct ConversionError;
+
+#[derive(thiserror::Error, Debug)]
+#[error("{0}")]
+pub struct ValidationError(pub &'static str);
+
+#[derive(thiserror::Error, Debug)]
+pub enum DatabaseError {
+    #[error("database pool error")]
+    DatabasePoolError(#[from] deadpool_postgres::PoolError),
+
+    #[error("database client error")]
+    DatabaseClientError(#[from] tokio_postgres::Error),
+
+    #[error("database type error")]
+    DatabaseTypeError(#[from] ConversionError),
+
+    #[error("{0}")]
+    NotFound(&'static str), // object type
+
+    #[error("{0}")]
+    AlreadyExists(&'static str), // object type
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum HttpError {
+    #[error(transparent)]
+    ActixError(#[from] actix_web::Error),
+
+    #[error("database error")]
+    DatabaseError(#[source] DatabaseError),
+
+    #[error("{0}")]
+    ValidationError(String),
+
+    #[error("{0}")]
+    ValidationErrorAuto(#[from] ValidationError),
+
+    #[error("{0}")]
+    SessionError(&'static str),
+
+    #[error("permission error")]
+    PermissionError,
+
+    #[error("{0} not found")]
+    NotFoundError(&'static str),
+
+    #[error("operation not supported")]
+    NotSupported,
+
+    #[error("internal error")]
+    InternalError,
+}
+
+impl From<DatabaseError> for HttpError {
+    fn from(err: DatabaseError) -> Self {
+        match err {
+            DatabaseError::NotFound(name) => HttpError::NotFoundError(name),
+            DatabaseError::AlreadyExists(name) => HttpError::ValidationError(
+                format!("{} already exists", name),
+            ),
+            _ => HttpError::DatabaseError(err),
+        }
+    }
+}
+
+#[derive(Serialize)]
+struct ErrorInfo {
+    message: String,
+}
+
+impl ResponseError for HttpError {
+    fn error_response(&self) -> HttpResponse {
+        let err = ErrorInfo { message: self.to_string() };
+        HttpResponseBuilder::new(self.status_code()).json(err)
+    }
+
+    fn status_code(&self) -> StatusCode {
+        match self {
+            HttpError::ActixError(err) => err.as_response_error().status_code(),
+            HttpError::ValidationError(_) => StatusCode::BAD_REQUEST,
+            HttpError::ValidationErrorAuto(_) => StatusCode::BAD_REQUEST,
+            HttpError::SessionError(_) => StatusCode::UNAUTHORIZED,
+            HttpError::PermissionError => StatusCode::FORBIDDEN,
+            HttpError::NotFoundError(_) => StatusCode::NOT_FOUND,
+            HttpError::NotSupported => StatusCode::IM_A_TEAPOT,
+            _ => StatusCode::INTERNAL_SERVER_ERROR,
+        }
+    }
+}
diff --git a/src/ethereum/api.rs b/src/ethereum/api.rs
new file mode 100644
index 0000000..e4ef4a4
--- /dev/null
+++ b/src/ethereum/api.rs
@@ -0,0 +1,10 @@
+use web3::{
+    api::Web3,
+    transports::Http,
+};
+
+pub fn connect(json_rpc_url: &str) -> Result<Web3<Http>, web3::Error> {
+    let transport = web3::transports::Http::new(json_rpc_url)?;
+    let connection = web3::Web3::new(transport);
+    Ok(connection)
+}
diff --git a/src/ethereum/mod.rs b/src/ethereum/mod.rs
new file mode 100644
index 0000000..90ba97a
--- /dev/null
+++ b/src/ethereum/mod.rs
@@ -0,0 +1,3 @@
+mod api;
+pub mod nft;
+pub mod utils;
diff --git a/src/ethereum/nft.rs b/src/ethereum/nft.rs
new file mode 100644
index 0000000..d66a7b5
--- /dev/null
+++ b/src/ethereum/nft.rs
@@ -0,0 +1,232 @@
+use std::convert::TryInto;
+use std::fs;
+use std::path::PathBuf;
+
+use web3::{
+    api::Web3,
+    contract::{Contract, Options},
+    ethabi::{Event, EventParam, ParamType, RawLog, token::Token, encode},
+    transports::Http,
+    types::{BlockNumber, FilterBuilder, H256, U256},
+};
+
+use crate::config::{Config, EthereumContract};
+use crate::database::{Pool, get_database_client};
+use crate::errors::DatabaseError;
+use crate::ipfs::utils::parse_ipfs_url;
+use crate::models::posts::queries::{
+    get_post_by_ipfs_cid,
+    update_post,
+    is_waiting_for_token,
+};
+use super::api::connect;
+use super::utils::{
+    parse_address, sign_message,
+    AddressError, SignatureData, SignatureError,
+};
+
+pub const COLLECTIBLE: &str = "Collectible";
+pub const MINTER: &str = "Minter";
+
+#[derive(thiserror::Error, Debug)]
+pub enum EthereumError {
+    #[error("io error")]
+    IoError(#[from] std::io::Error),
+
+    #[error("json error")]
+    JsonError(#[from] serde_json::Error),
+
+    #[error("invalid address")]
+    InvalidAddress(#[from] AddressError),
+
+    #[error(transparent)]
+    Web3Error(#[from] web3::Error),
+
+    #[error("artifact error")]
+    ArtifactError,
+
+    #[error("abi error")]
+    AbiError(#[from] web3::ethabi::Error),
+
+    #[error("contract error")]
+    ContractError(#[from] web3::contract::Error),
+
+    #[error("improprely configured")]
+    ImproperlyConfigured,
+
+    #[error("data conversion error")]
+    ConversionError,
+
+    #[error("token uri parsing error")]
+    TokenUriParsingError,
+
+    #[error(transparent)]
+    DatabaseError(#[from] DatabaseError),
+
+    #[error("signature error")]
+    SigError(#[from] SignatureError),
+}
+
+fn load_abi(
+    contract_dir: &PathBuf,
+    contract_name: &str,
+) -> Result<Vec<u8>, EthereumError> {
+    let contract_artifact_path = contract_dir.join(format!("{}.json", contract_name));
+    let contract_artifact = fs::read_to_string(contract_artifact_path)?;
+    let contract_artifact_value: serde_json::Value = serde_json::from_str(&contract_artifact)?;
+    let contract_abi = contract_artifact_value.get("abi")
+        .ok_or(EthereumError::ArtifactError)?
+        .to_string().as_bytes().to_vec();
+    Ok(contract_abi)
+}
+
+pub async fn get_nft_contract(
+    config: &Config,
+) -> Result<(Web3<Http>, Contract<Http>), EthereumError> {
+    let json_rpc_url = config.ethereum_json_rpc_url.as_ref()
+        .ok_or(EthereumError::ImproperlyConfigured)?;
+    let web3 = connect(json_rpc_url)?;
+    let ethereum_config = config.ethereum_contract.as_ref()
+        .ok_or(EthereumError::ImproperlyConfigured)?;
+
+    let minter_abi = load_abi(&config.contract_dir, MINTER)?;
+    let minter_address = parse_address(&ethereum_config.address)?;
+    let minter = Contract::from_json(
+        web3.eth(),
+        minter_address,
+        &minter_abi,
+    )?;
+
+    let token_address = minter.query("token", (), None, Options::default(), None).await?;
+    let token_abi = load_abi(&config.contract_dir, COLLECTIBLE)?;
+    let token = Contract::from_json(
+        web3.eth(),
+        token_address,
+        &token_abi,
+    )?;
+    log::info!("NFT contract address is {:?}", token.address());
+    Ok((web3, token))
+}
+
+#[derive(Debug)]
+struct TokenTransfer {
+    tx_id: Option<H256>,
+    from: Token,
+    to: Token,
+    token_id: Token,
+}
+
+pub async fn process_events(
+    web3: &Web3<Http>,
+    contract: &Contract<Http>,
+    db_pool: &Pool,
+) -> Result<(), EthereumError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    if !is_waiting_for_token(db_client).await? {
+        return Ok(());
+    }
+
+    // Search for Transfer events
+    let event_abi_params = vec![
+        EventParam {
+            name: "from".to_string(),
+            kind: ParamType::Address,
+            indexed: true,
+        },
+        EventParam {
+            name: "to".to_string(),
+            kind: ParamType::Address,
+            indexed: true,
+        },
+        EventParam {
+            name: "tokenId".to_string(),
+            kind: ParamType::Uint(256),
+            indexed: true,
+        },
+    ];
+    let event_abi = Event {
+        name: "Transfer".to_string(),
+        inputs: event_abi_params,
+        anonymous: false,
+    };
+    let filter = FilterBuilder::default()
+        .address(vec![contract.address()])
+        .topics(Some(vec![event_abi.signature()]), None, None, None)
+        .from_block(BlockNumber::Earliest)
+        .build();
+    let logs = web3.eth().logs(filter).await?;
+
+    // Convert web3 logs into ethabi logs
+    let transfers: Vec<TokenTransfer> = logs.iter().map(|log| {
+        let raw_log = RawLog {
+            topics: log.topics.clone(),
+            data: log.data.clone().0,
+        };
+        match event_abi.parse_log(raw_log) {
+            Ok(event) => {
+                let params = event.params;
+                let transfer = TokenTransfer {
+                    tx_id: log.transaction_hash,
+                    from: params[0].value.clone(),
+                    to: params[1].value.clone(),
+                    token_id: params[2].value.clone(),
+                };
+                Ok(transfer)
+            },
+            Err(err) => Err(err),
+        }
+    }).collect::<Result<_, web3::ethabi::Error>>()?;
+    for transfer in transfers {
+        let from_address = transfer.from.into_address()
+            .ok_or(EthereumError::ConversionError)?;
+        if from_address.is_zero() {
+            // Mint event found
+            let token_id_u256 = transfer.token_id.into_uint()
+                .ok_or(EthereumError::ConversionError)?;
+            let token_uri_result = contract.query("tokenURI", (token_id_u256,), None, Options::default(), None);
+            let token_uri: String = token_uri_result.await?;
+            let tx_id_h256 = transfer.tx_id.ok_or(EthereumError::ConversionError)?;
+            let tx_id = hex::encode(tx_id_h256.as_bytes());
+            let ipfs_cid = parse_ipfs_url(&token_uri)
+                .map_err(|_| EthereumError::TokenUriParsingError)?;
+            let mut post = match get_post_by_ipfs_cid(db_client, &ipfs_cid).await {
+                Ok(post) => post,
+                Err(err) => {
+                    // Post not found or some other error
+                    log::error!("{}", err);
+                    continue;
+                },
+            };
+            if post.token_id.is_none() {
+                log::info!("post {} was tokenized via {}", post.id, tx_id);
+                let token_id: i32 = token_id_u256.try_into()
+                    .map_err(|_| EthereumError::ConversionError)?;
+                post.token_id = Some(token_id);
+                post.token_tx_id = Some(tx_id);
+                update_post(db_client, &post).await?;
+            };
+        };
+    };
+    Ok(())
+}
+
+pub fn create_mint_signature(
+    contract_config: &EthereumContract,
+    user_address: &str,
+    token_uri: &str,
+) -> Result<SignatureData, EthereumError> {
+    let contract_address = parse_address(&contract_config.address)?;
+    let user_address = parse_address(user_address)?;
+    let chain_id: U256 = contract_config.chain_id.into();
+    let chain_id_token = Token::Uint(chain_id.into());
+    let chain_id_bin = encode(&[chain_id_token]);
+    let message = [
+        &chain_id_bin,
+        contract_address.as_bytes(),
+        "mint".as_bytes(),
+        user_address.as_bytes(),
+        token_uri.as_bytes(),
+    ].concat();
+    let signature = sign_message(&contract_config.signing_key, &message)?;
+    Ok(signature)
+}
diff --git a/src/ethereum/utils.rs b/src/ethereum/utils.rs
new file mode 100644
index 0000000..b07ad95
--- /dev/null
+++ b/src/ethereum/utils.rs
@@ -0,0 +1,59 @@
+use std::str::FromStr;
+
+use secp256k1::{Error as KeyError, SecretKey, rand::rngs::OsRng};
+use serde::Serialize;
+use web3::{
+    signing::{keccak256, Key, SigningError},
+    types::Address,
+};
+
+pub fn generate_ethereum_address() -> (SecretKey, Address) {
+    let mut rng = OsRng::new().expect("failed to initialize RNG");
+    let secret_key = SecretKey::new(&mut rng);
+    let address = Box::new(secret_key).address();
+    (secret_key, address)
+}
+
+#[derive(thiserror::Error, Debug)]
+#[error("address error")]
+pub struct AddressError;
+
+pub fn parse_address(address: &str) -> Result<Address, AddressError> {
+    Address::from_str(address).map_err(|_| AddressError)
+}
+
+#[derive(Serialize)]
+pub struct SignatureData {
+    pub v: u64,
+    pub r: String,
+    pub s: String,
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum SignatureError {
+    #[error("invalid key")]
+    InvalidKey(#[from] KeyError),
+
+    #[error("signing error")]
+    SigningError(#[from] SigningError),
+}
+
+pub fn sign_message(
+    signing_key: &str,
+    message: &[u8],
+) -> Result<SignatureData, SignatureError> {
+    let key = SecretKey::from_str(&signing_key)?;
+    let message_hash = keccak256(message);
+    let eip_191_message = [
+        "\x19Ethereum Signed Message:\n32".as_bytes(),
+        &message_hash,
+    ].concat();
+    let eip_191_message_hash = keccak256(&eip_191_message);
+    let signature = Box::new(key).sign(&eip_191_message_hash, None)?;
+    let signature_data = SignatureData {
+        v: signature.v,
+        r: hex::encode(signature.r.as_bytes()),
+        s: hex::encode(signature.s.as_bytes()),
+    };
+    Ok(signature_data)
+}
diff --git a/src/http_signatures/create.rs b/src/http_signatures/create.rs
new file mode 100644
index 0000000..0c731f5
--- /dev/null
+++ b/src/http_signatures/create.rs
@@ -0,0 +1,96 @@
+use chrono::Utc;
+use rsa::RsaPrivateKey;
+
+use crate::utils::crypto::{sign_message, get_message_digest};
+
+pub struct SignatureHeaders {
+    pub host: String,
+    pub date: String,
+    pub digest: String,
+    pub signature: String,
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum SignatureError {
+    #[error("invalid request url")]
+    UrlError,
+
+    #[error("signature error")]
+    SignatureError(#[from] rsa::errors::Error),
+}
+
+/// Creates HTTP signature according to the old HTTP Signatures Spec:
+/// https://datatracker.ietf.org/doc/html/draft-cavage-http-signatures.
+pub fn create_http_signature(
+    request_url: &str,
+    request_body: &str,
+    actor_key: RsaPrivateKey,
+    actor_key_id: String,
+) -> Result<SignatureHeaders, SignatureError> {
+    let request_url_object = url::Url::parse(request_url)
+        .map_err(|_| SignatureError::UrlError)?;
+    let host = request_url_object.host_str()
+        .ok_or(SignatureError::UrlError)?;
+    let date = Utc::now().to_rfc2822();
+    let digest = get_message_digest(request_body);
+    let message = format!(
+        "(request-target): post {}\nhost: {}\ndate: {}\ndigest: {}",
+        request_url_object.path(),
+        host,
+        date,
+        digest,
+    );
+    let headers_parameter = &["(request-target)", "host", "date", "digest"];
+    let signature_parameter = sign_message(&actor_key, &message)?;
+    let signature_header = format!(
+        r#"keyId="{}",headers="{}",signature="{}""#,
+        actor_key_id,
+        headers_parameter.join(" "),
+        signature_parameter,
+    );
+    let headers = SignatureHeaders {
+        host: host.to_string(),
+        date,
+        digest,
+        signature: signature_header,
+    };
+    Ok(headers)
+}
+
+#[cfg(test)]
+mod tests {
+    use rand::rngs::OsRng;
+    use super::*;
+
+    #[test]
+    fn test_create_signature() {
+        let request_url = "https://example.org/inbox";
+        let request_body = "{}";
+        let actor_key = RsaPrivateKey::new(&mut OsRng, 512).unwrap();
+        let actor_key_id = "https://myserver.org/actor#main-key";
+
+        let result = create_http_signature(
+            request_url,
+            request_body,
+            actor_key,
+            actor_key_id.to_string(),
+        );
+        assert_eq!(result.is_ok(), true);
+
+        let headers = result.unwrap();
+        assert_eq!(headers.host, "example.org");
+        assert_eq!(
+            headers.digest,
+            "SHA-256=RBNvo1WzZ4oRRq0W9+hknpT7T8If536DEMBg9hyq/4o=",
+        );
+        let expected_signature_header = concat!(
+            r#"keyId="https://myserver.org/actor#main-key","#,
+            r#"headers="(request-target) host date digest","#,
+            r#"signature=""#,
+        );
+        assert_eq!(
+            headers.signature.starts_with(expected_signature_header),
+            true,
+        );
+    }
+}
diff --git a/src/http_signatures/mod.rs b/src/http_signatures/mod.rs
new file mode 100644
index 0000000..c414f99
--- /dev/null
+++ b/src/http_signatures/mod.rs
@@ -0,0 +1,2 @@
+pub mod create;
+pub mod verify;
diff --git a/src/http_signatures/verify.rs b/src/http_signatures/verify.rs
new file mode 100644
index 0000000..87ed864
--- /dev/null
+++ b/src/http_signatures/verify.rs
@@ -0,0 +1,197 @@
+use actix_web::{
+    HttpRequest,
+    http::{HeaderMap, Method, Uri},
+};
+use regex::Regex;
+
+use crate::activitypub::actor::Actor;
+use crate::activitypub::fetcher::fetch_profile_by_actor_id;
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::DatabaseError;
+use crate::models::profiles::queries::{
+    get_profile_by_actor_id,
+    create_profile,
+};
+use crate::utils::crypto::{deserialize_public_key, verify_signature};
+
+#[derive(thiserror::Error, Debug)]
+pub enum VerificationError {
+    #[error("{0}")]
+    HeaderError(&'static str),
+
+    #[error("{0}")]
+    ParseError(&'static str),
+
+    #[error("invalid key ID")]
+    UrlError(#[from] url::ParseError),
+
+    #[error("actor error")]
+    ActorError,
+
+    #[error("invalid key")]
+    InvalidKey(#[from] rsa::pkcs8::Error),
+
+    #[error("invalid signature")]
+    InvalidSignature,
+}
+
+pub struct SignatureData {
+    pub actor_id: String,
+    pub message: String, // reconstructed message
+    pub signature: String, // base64-encoded signature
+}
+
+fn parse_http_signature(
+    request_method: &Method,
+    request_uri: &Uri,
+    request_headers: &HeaderMap,
+) -> Result<SignatureData, VerificationError> {
+    let signature_header = request_headers.get("signature")
+        .ok_or(VerificationError::HeaderError("missing signature header"))?
+        .to_str()
+        .map_err(|_| VerificationError::HeaderError("invalid signature header"))?;
+    // TODO: support arbitrary parameter order
+    let signature_header_regexp_raw = concat!(
+        r#"keyId="(?P<key_id>.+)","#,
+        r#"headers="(?P<headers>.+)","#,
+        r#"signature="(?P<signature>.+)""#,
+    );
+    let signature_header_regexp = Regex::new(signature_header_regexp_raw).unwrap();
+    let signature_header_caps = signature_header_regexp
+        .captures(&signature_header)
+        .ok_or(VerificationError::HeaderError("invalid signature header"))?;
+    let key_id = signature_header_caps.name("key_id")
+        .ok_or(VerificationError::ParseError("keyId parameter is missing"))?
+        .as_str()
+        .to_owned();
+    let headers_parameter = signature_header_caps.name("headers")
+        .ok_or(VerificationError::ParseError("headers parameter is missing"))?
+        .as_str()
+        .to_owned();
+    let signature = signature_header_caps.name("signature")
+        .ok_or(VerificationError::ParseError("signature is missing"))?
+        .as_str()
+        .to_owned();
+
+    let mut message = format!(
+        "(request-target): {} {}",
+        request_method.as_str().to_lowercase(),
+        request_uri,
+    );
+    for header in headers_parameter.split(" ") {
+        if header == "(request-target)" {
+            continue;
+        }
+        let header_value = request_headers.get(header)
+            .ok_or(VerificationError::HeaderError("missing header"))?
+            .to_str()
+            .map_err(|_| VerificationError::HeaderError("invalid header value"))?;
+        let message_part = format!(
+            "\n{}: {}",
+            header,
+            header_value,
+        );
+        message.push_str(&message_part);
+    }
+
+    let key_url = url::Url::parse(&key_id)?;
+    let actor_id = &key_url[..url::Position::BeforeQuery];
+
+    let signature_data = SignatureData {
+        actor_id: actor_id.to_string(),
+        message,
+        signature,
+    };
+    Ok(signature_data)
+}
+
+pub async fn verify_http_signature(
+    config: &Config,
+    db_pool: &Pool,
+    request: &HttpRequest,
+) -> Result<(), VerificationError> {
+    let signature_data = parse_http_signature(
+        request.method(),
+        request.uri(),
+        request.headers(),
+    )?;
+
+    let db_client = &**get_database_client(db_pool).await
+        .map_err(|_| VerificationError::ActorError)?;
+    let actor_profile = match get_profile_by_actor_id(db_client, &signature_data.actor_id).await {
+        Ok(profile) => profile,
+        Err(err) => match err {
+            DatabaseError::NotFound(_) => {
+                let profile_data = fetch_profile_by_actor_id(
+                    &signature_data.actor_id,
+                    &config.media_dir(),
+                ).await.map_err(|err| {
+                    log::error!("{}", err);
+                    VerificationError::ActorError
+                })?;
+                let profile = create_profile(
+                    db_client,
+                    &profile_data,
+                ).await.map_err(|_| VerificationError::ActorError)?;
+                profile
+            },
+            _ => {
+                return Err(VerificationError::ActorError);
+            },
+        },
+    };
+    let actor_value = actor_profile.actor_json.ok_or(VerificationError::ActorError)?;
+    let actor: Actor = serde_json::from_value(actor_value)
+        .map_err(|_| VerificationError::ActorError)?;
+
+    let public_key = deserialize_public_key(&actor.public_key.public_key_pem)?;
+    let is_valid_signature = verify_signature(
+        &public_key,
+        &signature_data.message,
+        &signature_data.signature,
+    ).map_err(|_| VerificationError::InvalidSignature)?;
+    if !is_valid_signature {
+        return Err(VerificationError::InvalidSignature);
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use std::str::FromStr;
+    use actix_web::http::{header, HeaderMap, HeaderName, HeaderValue, Uri};
+    use super::*;
+
+    #[test]
+    fn test_parse_signature() {
+        let request_method = Method::from_str("POST").unwrap();
+        let request_uri = "/user/123/inbox".parse::<Uri>().unwrap();
+        let mut request_headers = HeaderMap::new();
+        request_headers.insert(
+            header::HOST,
+            HeaderValue::from_static("example.com"),
+        );
+        let signature_header = concat!(
+            r#"keyId="https://myserver.org/actor#main-key","#,
+            r#"headers="(request-target) host","#,
+            r#"signature="test""#,
+        );
+        request_headers.insert(
+            HeaderName::from_static("signature"),
+            HeaderValue::from_static(signature_header),
+        );
+
+        let signature_data = parse_http_signature(
+            &request_method,
+            &request_uri,
+            &request_headers,
+        ).unwrap();
+        assert_eq!(signature_data.actor_id, "https://myserver.org/actor");
+        assert_eq!(
+            signature_data.message,
+            "(request-target): post /user/123/inbox\nhost: example.com",
+        );
+        assert_eq!(signature_data.signature, "test");
+    }
+}
diff --git a/src/ipfs/mod.rs b/src/ipfs/mod.rs
new file mode 100644
index 0000000..ca7140d
--- /dev/null
+++ b/src/ipfs/mod.rs
@@ -0,0 +1,2 @@
+pub mod store;
+pub mod utils;
diff --git a/src/ipfs/store.rs b/src/ipfs/store.rs
new file mode 100644
index 0000000..8a6c351
--- /dev/null
+++ b/src/ipfs/store.rs
@@ -0,0 +1,26 @@
+/// https://docs.ipfs.io/reference/http/api/
+
+use reqwest::{multipart, Client};
+use serde::Deserialize;
+
+#[derive(Deserialize)]
+#[serde(rename_all="PascalCase")]
+struct ObjectAdded {
+    hash: String,
+}
+
+/// Add file to IPFS.
+/// Returns CID v1 of the object.
+pub async fn add(ipfs_api_url: &str, data: Vec<u8>) -> Result<String, reqwest::Error> {
+    let client = Client::new();
+    let file_part = multipart::Part::bytes(data);
+    let form = multipart::Form::new().part("file", file_part);
+    let url = format!("{}/api/v0/add", ipfs_api_url);
+    let response = client.post(&url)
+        .query(&[("cid-version", 1)])
+        .multipart(form)
+        .send()
+        .await?;
+    let info: ObjectAdded = response.json().await?;
+    Ok(info.hash)
+}
diff --git a/src/ipfs/utils.rs b/src/ipfs/utils.rs
new file mode 100644
index 0000000..e46edac
--- /dev/null
+++ b/src/ipfs/utils.rs
@@ -0,0 +1,20 @@
+use regex::Regex;
+
+pub const IPFS_LOGO: &str = "bafybeihc4hti5ix4ds2tefhy35qd4c7n5as5cazdmksrxj7ipvcxm64h54";
+
+pub fn get_ipfs_url(cid: &str) -> String {
+    format!("ipfs://{}", cid)
+}
+
+#[derive(thiserror::Error, Debug)]
+#[error("parse error")]
+pub struct ParseError;
+
+pub fn parse_ipfs_url(url: &str) -> Result<String, ParseError> {
+    let regexp = Regex::new(r"ipfs://(?P<cid>\w+)").unwrap();
+    let caps = regexp.captures(&url).ok_or(ParseError)?;
+    let cid = caps.name("cid")
+        .ok_or(ParseError)?
+        .as_str().to_string();
+    Ok(cid)
+}
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..19f3791
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,14 @@
+pub mod activitypub;
+pub mod config;
+pub mod database;
+mod errors;
+pub mod ethereum;
+mod http_signatures;
+mod ipfs;
+pub mod logger;
+pub mod mastodon_api;
+pub mod models;
+pub mod nodeinfo;
+pub mod scheduler;
+mod utils;
+pub mod webfinger;
diff --git a/src/logger.rs b/src/logger.rs
new file mode 100644
index 0000000..2b80a82
--- /dev/null
+++ b/src/logger.rs
@@ -0,0 +1,17 @@
+use chrono::Local;
+use std::io::Write;
+
+pub fn configure_logger() -> () {
+    env_logger::Builder::new()
+        .format(|buf, record| {
+            writeln!(buf,
+                "{} {} [{}] {}",
+                Local::now().format("%Y-%m-%dT%H:%M:%S"),
+                record.target(),
+                record.level(),
+                record.args(),
+            )
+        })
+        .filter(None, log::LevelFilter::Info)
+        .init();
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c081101
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,101 @@
+use actix_cors::Cors;
+use actix_session::CookieSession;
+use actix_web::{
+    web,
+    App, HttpServer,
+    middleware::Logger as ActixLogger,
+};
+
+use mitra::activitypub::views::{activitypub_scope, get_object};
+use mitra::config::{Environment, parse_config};
+use mitra::database::create_pool;
+use mitra::database::migrate::apply_migrations;
+use mitra::logger::configure_logger;
+use mitra::mastodon_api::accounts::views::account_api_scope;
+use mitra::mastodon_api::directory::views::profile_directory;
+use mitra::mastodon_api::instance::views as instance_api;
+use mitra::mastodon_api::media::views::media_api_scope;
+use mitra::mastodon_api::search::views::search;
+use mitra::mastodon_api::statuses::views::status_api_scope;
+use mitra::mastodon_api::timelines::views as timeline_api;
+use mitra::mastodon_api::users::views as user_api;
+use mitra::nodeinfo::views as nodeinfo;
+use mitra::scheduler;
+use mitra::webfinger::views as webfinger;
+
+const MAX_UPLOAD_SIZE: usize = 1024 * 1024 * 10;
+
+#[actix_web::main]
+async fn main() -> std::io::Result<()> {
+    let config = parse_config();
+    configure_logger();
+    let db_pool = create_pool(&config.database_url);
+    apply_migrations(&db_pool).await;
+    log::info!(
+        "app initialized; environment = '{:?}'",
+        config.environment,
+    );
+
+    scheduler::run(config.clone(), db_pool.clone());
+    log::info!("scheduler started");
+
+    let http_socket_addr = format!(
+        "{}:{}",
+        config.http_host,
+        config.http_port,
+    );
+    let num_workers = std::cmp::max(num_cpus::get(), 4);
+    HttpServer::new(move || {
+        let cors_config = match config.environment {
+            Environment::Development => {
+                Cors::permissive()
+            },
+            Environment::Production => {
+                let allowed_origin = config.instance_url();
+                Cors::default().allowed_origin(&allowed_origin)
+                    .allow_any_method()
+                    .allow_any_header()
+            },
+        };
+        let cookie_config = CookieSession::signed(config.cookie_secret_key.as_bytes())
+            .name(config.cookie_name.clone())
+            .max_age(86400 * 30)
+            .secure(true);
+        App::new()
+            .wrap(ActixLogger::new("%r : %s : %{r}a"))
+            .wrap(cors_config)
+            .wrap(cookie_config)
+            .data(web::PayloadConfig::default().limit(MAX_UPLOAD_SIZE))
+            .data(web::JsonConfig::default().limit(MAX_UPLOAD_SIZE))
+            .data(config.clone())
+            .data(db_pool.clone())
+            .service(actix_files::Files::new(
+                "/media",
+                config.media_dir(),
+            ))
+            .service(actix_files::Files::new(
+                "/contracts",
+                config.contract_dir.clone(),
+            ))
+            .service(user_api::create_user_view)
+            .service(user_api::login_view)
+            .service(user_api::current_user_view)
+            .service(user_api::logout_view)
+            .service(profile_directory)
+            .service(account_api_scope())
+            .service(media_api_scope())
+            .service(status_api_scope())
+            .service(instance_api::instance)
+            .service(search)
+            .service(timeline_api::home_timeline)
+            .service(webfinger::get_descriptor)
+            .service(activitypub_scope())
+            .service(get_object)
+            .service(nodeinfo::get_nodeinfo)
+            .service(nodeinfo::get_nodeinfo_2_0)
+    })
+    .workers(num_workers)
+    .bind(http_socket_addr)?
+    .run()
+    .await
+}
diff --git a/src/mastodon_api/accounts/mod.rs b/src/mastodon_api/accounts/mod.rs
new file mode 100644
index 0000000..a964b01
--- /dev/null
+++ b/src/mastodon_api/accounts/mod.rs
@@ -0,0 +1,2 @@
+pub mod types;
+pub mod views;
diff --git a/src/mastodon_api/accounts/types.rs b/src/mastodon_api/accounts/types.rs
new file mode 100644
index 0000000..f96ee36
--- /dev/null
+++ b/src/mastodon_api/accounts/types.rs
@@ -0,0 +1,118 @@
+use std::path::PathBuf;
+
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use crate::models::profiles::types::{DbActorProfile, ProfileUpdateData};
+use crate::utils::files::{FileError, save_validated_b64_file, get_file_url};
+
+/// https://docs.joinmastodon.org/entities/source/
+#[derive(Serialize)]
+pub struct Source {
+    pub note: Option<String>,
+}
+
+/// https://docs.joinmastodon.org/entities/account/
+#[derive(Serialize)]
+pub struct Account {
+    pub id: Uuid,
+    pub username: String,
+    pub acct: String,
+    pub display_name: Option<String>,
+    pub created_at: DateTime<Utc>,
+    pub note: Option<String>,
+    pub avatar: Option<String>,
+    pub header: Option<String>,
+    pub followers_count: i32,
+    pub following_count: i32,
+    pub statuses_count: i32,
+
+    pub source: Option<Source>,
+}
+
+impl Account {
+    pub fn from_profile(profile: DbActorProfile, instance_url: &str) -> Self {
+        let avatar_url = profile.avatar_file_name.map(|name| get_file_url(instance_url, &name));
+        let header_url = profile.banner_file_name.map(|name| get_file_url(instance_url, &name));
+        let source = if profile.actor_json.is_some() {
+            // Remote actor
+            None
+        } else {
+            let source = Source { note: profile.bio_source };
+            Some(source)
+        };
+        Self {
+            id: profile.id,
+            username: profile.username,
+            acct: profile.acct,
+            display_name: profile.display_name,
+            created_at: profile.created_at,
+            note: profile.bio,
+            avatar: avatar_url,
+            header: header_url,
+            followers_count: profile.follower_count,
+            following_count: profile.following_count,
+            statuses_count: profile.post_count,
+            source,
+        }
+    }
+}
+
+/// https://docs.joinmastodon.org/methods/accounts/
+#[derive(Deserialize)]
+pub struct AccountUpdateData {
+    pub display_name: Option<String>,
+    pub note: Option<String>,
+    pub note_source: Option<String>,
+    pub avatar: Option<String>,
+    pub header: Option<String>,
+}
+
+fn process_b64_image_field_value(
+    form_value: Option<String>,
+    db_value: Option<String>,
+    output_dir: &PathBuf,
+) -> Result<Option<String>, FileError> {
+    let maybe_file_name = match form_value {
+        Some(b64_data) => {
+            if b64_data == "" {
+                // Remove file
+                None
+            } else {
+                // Decode and save file
+                let (file_name, _) = save_validated_b64_file(
+                    &b64_data, &output_dir, "image/",
+                )?;
+                Some(file_name)
+            }
+        },
+        // Keep current value
+        None => db_value,
+    };
+    Ok(maybe_file_name)
+}
+
+impl AccountUpdateData {
+    pub fn into_profile_data(
+        self,
+        current_avatar: &Option<String>,
+        current_banner: &Option<String>,
+        media_dir: &PathBuf,
+    ) -> Result<ProfileUpdateData, FileError> {
+        let avatar = process_b64_image_field_value(
+            self.avatar, current_avatar.clone(), media_dir,
+        )?;
+        let banner = process_b64_image_field_value(
+            self.header, current_banner.clone(), media_dir,
+        )?;
+        let profile_data = ProfileUpdateData {
+            display_name: self.display_name,
+            bio: self.note,
+            bio_source: self.note_source,
+            avatar,
+            banner,
+        };
+        Ok(profile_data)
+    }
+}
diff --git a/src/mastodon_api/accounts/views.rs b/src/mastodon_api/accounts/views.rs
new file mode 100644
index 0000000..a5a0ac1
--- /dev/null
+++ b/src/mastodon_api/accounts/views.rs
@@ -0,0 +1,207 @@
+use actix_session::Session;
+use actix_web::{get, post, patch, web, HttpResponse, Scope};
+use serde::Deserialize;
+use uuid::Uuid;
+
+use crate::activitypub::activity::{
+    create_activity_follow,
+    create_activity_undo_follow,
+};
+use crate::activitypub::actor::Actor;
+use crate::activitypub::deliverer::deliver_activity;
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::mastodon_api::statuses::types::Status;
+use crate::mastodon_api::users::auth::get_current_user;
+use crate::models::posts::queries::get_posts_by_author;
+use crate::models::profiles::queries::{
+    get_profile_by_id,
+    update_profile,
+};
+use crate::models::relationships::queries as follows;
+use crate::utils::files::FileError;
+use super::types::{Account, AccountUpdateData};
+
+#[get("/{account_id}")]
+async fn get_account(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    web::Path(account_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let profile = get_profile_by_id(db_client, &account_id).await?;
+    let account = Account::from_profile(profile, &config.instance_url());
+    Ok(HttpResponse::Ok().json(account))
+}
+
+#[patch("/update_credentials")]
+async fn update_credentials(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    data: web::Json<AccountUpdateData>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let current_user = get_current_user(db_client, session).await?;
+    let profile = get_profile_by_id(db_client, &current_user.id).await?;
+    let mut profile_data = data.into_inner()
+        .into_profile_data(
+            &profile.avatar_file_name,
+            &profile.banner_file_name,
+            &config.media_dir(),
+        )
+        .map_err(|err| {
+            match err {
+                FileError::Base64DecodingError(_) => {
+                    HttpError::ValidationError("base64 decoding error".into())
+                },
+                FileError::InvalidMediaType => {
+                    HttpError::ValidationError("invalid media type".into())
+                },
+                _ => HttpError::InternalError,
+            }
+        })?;
+    profile_data.clean()?;
+    let updated_profile = update_profile(
+        db_client,
+        &profile.id,
+        profile_data,
+    ).await?;
+    let account = Account::from_profile(updated_profile, &config.instance_url());
+    Ok(HttpResponse::Ok().json(account))
+}
+
+// TODO: actix currently doesn't support parameter arrays
+// https://github.com/actix/actix-web/issues/2044
+#[derive(Deserialize)]
+pub struct RelationshipQueryParams {
+    #[serde(rename(deserialize = "id[]"))]
+    id: Uuid,
+}
+
+#[get("/relationships")]
+async fn get_relationships(
+    db_pool: web::Data<Pool>,
+    session: Session,
+    query_params: web::Query<RelationshipQueryParams>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let current_user = get_current_user(db_client, session).await?;
+    let relationships = follows::get_relationships(
+        db_client,
+        current_user.id,
+        vec![query_params.into_inner().id],
+    ).await?;
+    Ok(HttpResponse::Ok().json(relationships))
+}
+
+#[post("/{account_id}/follow")]
+async fn follow(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    web::Path(account_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &mut **get_database_client(&db_pool).await?;
+    let current_user = get_current_user(db_client, session).await?;
+    let profile = get_profile_by_id(db_client, &account_id).await?;
+    let relationship = if let Some(actor_value) = profile.actor_json {
+        // Remote follow
+        let request = follows::create_follow_request(db_client, &current_user.id, &profile.id).await?;
+        let actor: Actor = serde_json::from_value(actor_value)
+            .map_err(|_| HttpError::InternalError)?;
+        let activity = create_activity_follow(
+            &config,
+            &current_user.profile,
+            &request.id,
+            &actor.id,
+        );
+        let activity_sender = current_user.clone();
+        actix_rt::spawn(async move {
+            deliver_activity(
+                &config,
+                &activity_sender,
+                activity,
+                vec![actor],
+            ).await;
+        });
+        follows::get_relationship(db_client, &current_user.id, &profile.id).await?
+    } else {
+        follows::follow(db_client, &current_user.id, &profile.id).await?
+    };
+    Ok(HttpResponse::Ok().json(relationship))
+}
+
+#[post("/{account_id}/unfollow")]
+async fn unfollow(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    web::Path(account_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &mut **get_database_client(&db_pool).await?;
+    let current_user = get_current_user(db_client, session).await?;
+    let target_profile = get_profile_by_id(db_client, &account_id).await?;
+    let relationship = if let Some(actor_value) = target_profile.actor_json {
+        // Remote follow
+        let follow_request = follows::get_follow_request_by_path(
+            db_client,
+            &current_user.id,
+            &target_profile.id,
+        ).await?;
+        let relationship = follows::unfollow(
+            db_client,
+            &current_user.id,
+            &target_profile.id,
+        ).await?;
+        // Federate
+        let actor: Actor = serde_json::from_value(actor_value)
+            .map_err(|_| HttpError::InternalError)?;
+        let activity = create_activity_undo_follow(
+            &config,
+            &current_user.profile,
+            &follow_request.id,
+            &actor.id,
+        );
+        actix_rt::spawn(async move {
+            deliver_activity(
+                &config,
+                &current_user,
+                activity,
+                vec![actor],
+            ).await;
+        });
+        // TODO: uncouple unfollow and get_relationship
+        relationship
+    } else {
+        follows::unfollow(db_client, &current_user.id, &target_profile.id).await?
+    };
+    Ok(HttpResponse::Ok().json(relationship))
+}
+
+#[get("/{account_id}/statuses")]
+async fn get_account_statuses(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    web::Path(account_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let posts = get_posts_by_author(db_client, &account_id).await?;
+    let statuses: Vec<Status> = posts.into_iter()
+        .map(|post| Status::from_post(post, &config.instance_url()))
+        .collect();
+    Ok(HttpResponse::Ok().json(statuses))
+}
+
+pub fn account_api_scope() -> Scope {
+    web::scope("/api/v1/accounts")
+        // Routes without account ID
+        .service(get_relationships)
+        .service(update_credentials)
+        // Routes with account ID
+        .service(get_account)
+        .service(follow)
+        .service(unfollow)
+        .service(get_account_statuses)
+}
diff --git a/src/mastodon_api/directory/mod.rs b/src/mastodon_api/directory/mod.rs
new file mode 100644
index 0000000..38b4403
--- /dev/null
+++ b/src/mastodon_api/directory/mod.rs
@@ -0,0 +1 @@
+pub mod views;
diff --git a/src/mastodon_api/directory/views.rs b/src/mastodon_api/directory/views.rs
new file mode 100644
index 0000000..7878ce0
--- /dev/null
+++ b/src/mastodon_api/directory/views.rs
@@ -0,0 +1,24 @@
+use actix_session::Session;
+use actix_web::{get, web, HttpResponse};
+
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::mastodon_api::accounts::types::Account;
+use crate::mastodon_api::users::auth::get_current_user;
+use crate::models::profiles::queries::get_profiles;
+
+#[get("/api/v1/directory")]
+pub async fn profile_directory(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    get_current_user(db_client, session).await?;
+    let accounts: Vec<Account> = get_profiles(db_client).await?
+        .into_iter()
+        .map(|profile| Account::from_profile(profile, &config.instance_url()))
+        .collect();
+    Ok(HttpResponse::Ok().json(accounts))
+}
diff --git a/src/mastodon_api/instance/mod.rs b/src/mastodon_api/instance/mod.rs
new file mode 100644
index 0000000..a964b01
--- /dev/null
+++ b/src/mastodon_api/instance/mod.rs
@@ -0,0 +1,2 @@
+pub mod types;
+pub mod views;
diff --git a/src/mastodon_api/instance/types.rs b/src/mastodon_api/instance/types.rs
new file mode 100644
index 0000000..a6269d4
--- /dev/null
+++ b/src/mastodon_api/instance/types.rs
@@ -0,0 +1,40 @@
+use serde::Serialize;
+
+use crate::config::Config;
+use crate::ethereum::nft::MINTER;
+
+#[derive(Serialize)]
+pub struct Instance {
+    uri: String,
+    title: String,
+    short_description: String,
+    description: String,
+    version: String,
+    registrations: bool,
+
+    login_message: String,
+    ethereum_explorer_url: Option<String>,
+    nft_contract_name: Option<String>,
+    nft_contract_address: Option<String>,
+    ipfs_gateway_url: Option<String>,
+}
+
+impl From<&Config> for Instance {
+    fn from(config: &Config) -> Self {
+        Self {
+            uri: config.instance_uri.clone(),
+            title: config.instance_title.clone(),
+            short_description: config.instance_short_description.clone(),
+            description: config.instance_description.clone(),
+            version: config.version.clone(),
+            registrations: config.registrations_open.clone(),
+            login_message: config.login_message.clone(),
+            ethereum_explorer_url: config.ethereum_explorer_url.clone(),
+            nft_contract_name: config.ethereum_contract.as_ref()
+                .and(Some(MINTER.into())),
+            nft_contract_address: config.ethereum_contract.as_ref()
+                .map(|val| val.address.clone()),
+            ipfs_gateway_url: config.ipfs_gateway_url.clone(),
+        }
+    }
+}
diff --git a/src/mastodon_api/instance/views.rs b/src/mastodon_api/instance/views.rs
new file mode 100644
index 0000000..43cce0c
--- /dev/null
+++ b/src/mastodon_api/instance/views.rs
@@ -0,0 +1,13 @@
+use actix_web::{get, web, HttpResponse};
+
+use crate::config::Config;
+use crate::errors::HttpError;
+use super::types::Instance;
+
+#[get("/api/v1/instance")]
+pub async fn instance(
+    instance_config: web::Data<Config>,
+) -> Result<HttpResponse, HttpError> {
+    let instance = Instance::from(instance_config.as_ref());
+    Ok(HttpResponse::Ok().json(instance))
+}
diff --git a/src/mastodon_api/media/mod.rs b/src/mastodon_api/media/mod.rs
new file mode 100644
index 0000000..a964b01
--- /dev/null
+++ b/src/mastodon_api/media/mod.rs
@@ -0,0 +1,2 @@
+pub mod types;
+pub mod views;
diff --git a/src/mastodon_api/media/types.rs b/src/mastodon_api/media/types.rs
new file mode 100644
index 0000000..5d320c6
--- /dev/null
+++ b/src/mastodon_api/media/types.rs
@@ -0,0 +1,42 @@
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use crate::models::attachments::types::{
+    DbMediaAttachment,
+    AttachmentType,
+};
+use crate::utils::files::get_file_url;
+
+/// https://docs.joinmastodon.org/methods/statuses/media/
+#[derive(Deserialize)]
+pub struct AttachmentCreateData {
+    // base64-encoded file
+    pub file: String,
+}
+
+/// https://docs.joinmastodon.org/entities/attachment/
+#[derive(Serialize)]
+pub struct Attachment {
+    pub id: Uuid,
+
+    #[serde(rename = "type")]
+    pub attachment_type: String,
+
+    pub url: String,
+}
+
+impl Attachment {
+    pub fn from_db(db_object: DbMediaAttachment, instance_url: &str) -> Self {
+        let attachment_type = AttachmentType::from_media_type(db_object.media_type);
+        let attachment_type_mastodon = match attachment_type {
+            AttachmentType::Unknown => "unknown",
+            AttachmentType::Image => "image",
+        };
+        let attachment_url = get_file_url(instance_url, &db_object.file_name);
+        Self {
+            id: db_object.id,
+            attachment_type: attachment_type_mastodon.to_string(),
+            url: attachment_url,
+        }
+    }
+}
diff --git a/src/mastodon_api/media/views.rs b/src/mastodon_api/media/views.rs
new file mode 100644
index 0000000..d84ec08
--- /dev/null
+++ b/src/mastodon_api/media/views.rs
@@ -0,0 +1,44 @@
+use actix_session::Session;
+use actix_web::{post, web, HttpResponse, Scope};
+
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::mastodon_api::users::auth::get_current_user;
+use crate::models::attachments::queries::create_attachment;
+use crate::utils::files::{FileError, save_b64_file};
+use super::types::{AttachmentCreateData, Attachment};
+
+#[post("")]
+async fn create_attachment_view(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    data: web::Json<AttachmentCreateData>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = get_database_client(&db_pool).await?;
+    let current_user = get_current_user(&**db_client, session).await?;
+    let (file_name, media_type) = save_b64_file(
+        &data.file,
+        &config.media_dir(),
+    ).map_err(|err| match err {
+        FileError::Base64DecodingError(err) => HttpError::ValidationError(err.to_string()),
+        _ => HttpError::InternalError,
+    })?;
+    let db_attachment = create_attachment(
+        &**db_client,
+        &current_user.id,
+        media_type,
+        file_name,
+    ).await?;
+    let attachment = Attachment::from_db(
+        db_attachment,
+        &config.instance_url(),
+    );
+    Ok(HttpResponse::Ok().json(attachment))
+}
+
+pub fn media_api_scope() -> Scope {
+    web::scope("/api/v1/media")
+        .service(create_attachment_view)
+}
diff --git a/src/mastodon_api/mod.rs b/src/mastodon_api/mod.rs
new file mode 100644
index 0000000..9265da8
--- /dev/null
+++ b/src/mastodon_api/mod.rs
@@ -0,0 +1,8 @@
+pub mod accounts;
+pub mod directory;
+pub mod instance;
+pub mod media;
+pub mod search;
+pub mod statuses;
+pub mod timelines;
+pub mod users;
diff --git a/src/mastodon_api/search/mod.rs b/src/mastodon_api/search/mod.rs
new file mode 100644
index 0000000..6cd31d7
--- /dev/null
+++ b/src/mastodon_api/search/mod.rs
@@ -0,0 +1,3 @@
+pub mod queries;
+pub mod types;
+pub mod views;
diff --git a/src/mastodon_api/search/queries.rs b/src/mastodon_api/search/queries.rs
new file mode 100644
index 0000000..b9c333a
--- /dev/null
+++ b/src/mastodon_api/search/queries.rs
@@ -0,0 +1,47 @@
+use regex::Regex;
+use tokio_postgres::GenericClient;
+
+use crate::activitypub::fetcher::fetch_profile;
+use crate::config::Config;
+use crate::errors::{ValidationError, HttpError};
+use crate::models::profiles::queries::{create_profile, search_profile};
+use crate::models::profiles::types::DbActorProfile;
+
+fn parse_search_query(query: &str) ->
+    Result<(String, Option<String>), ValidationError>
+{
+    let acct_regexp = Regex::new(r"^@?(?P<user>\w+)(@(?P<instance>[\w\.-]+))?").unwrap();
+    let acct_caps = acct_regexp.captures(query)
+        .ok_or(ValidationError("invalid search query"))?;
+    let username = acct_caps.name("user")
+        .ok_or(ValidationError("invalid search query"))?
+        .as_str().to_string();
+    let instance = acct_caps.name("instance")
+        .and_then(|val| Some(val.as_str().to_string()));
+    Ok((username, instance))
+}
+
+pub async fn search(
+    config: &Config,
+    db_client: &impl GenericClient,
+    search_query: &str,
+) -> Result<Vec<DbActorProfile>, HttpError> {
+    let (username, instance) = parse_search_query(search_query)?;
+    let mut profiles = search_profile(db_client, &username, &instance).await?;
+    if profiles.len() == 0 && instance.is_some() {
+        let instance_uri = instance.unwrap();
+        let media_dir = config.media_dir();
+        let profile_data = fetch_profile(&username, &instance_uri, &media_dir).await
+            .map_err(|err| {
+                log::warn!("{}", err);
+                HttpError::NotFoundError("remote profile")
+            })?;
+        let profile = create_profile(db_client, &profile_data).await?;
+        log::info!(
+            "imported profile '{}'",
+            profile.acct,
+        );
+        profiles.push(profile);
+    }
+    Ok(profiles)
+}
diff --git a/src/mastodon_api/search/types.rs b/src/mastodon_api/search/types.rs
new file mode 100644
index 0000000..5751fad
--- /dev/null
+++ b/src/mastodon_api/search/types.rs
@@ -0,0 +1,9 @@
+use serde::Serialize;
+
+use crate::mastodon_api::accounts::types::Account;
+
+/// https://docs.joinmastodon.org/methods/search/
+#[derive(Serialize)]
+pub struct SearchResults {
+    pub accounts: Vec<Account>,
+}
diff --git a/src/mastodon_api/search/views.rs b/src/mastodon_api/search/views.rs
new file mode 100644
index 0000000..81646af
--- /dev/null
+++ b/src/mastodon_api/search/views.rs
@@ -0,0 +1,33 @@
+use actix_session::Session;
+use actix_web::{get, web, HttpResponse};
+use serde::Deserialize;
+
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::mastodon_api::accounts::types::Account;
+use crate::mastodon_api::users::auth::get_current_user;
+use super::queries;
+use super::types::SearchResults;
+
+#[derive(Deserialize)]
+struct SearchQueryParams {
+    q: String,
+}
+
+#[get("/api/v2/search")]
+async fn search(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    query_params: web::Query<SearchQueryParams>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = get_database_client(&db_pool).await?;
+    get_current_user(&**db_client, session).await?;
+    let profiles = queries::search(&config, &**db_client, &query_params.q).await?;
+    let accounts: Vec<Account> = profiles.into_iter()
+        .map(|profile| Account::from_profile(profile, &config.instance_url()))
+        .collect();
+    let results = SearchResults { accounts };
+    Ok(HttpResponse::Ok().json(results))
+}
diff --git a/src/mastodon_api/statuses/mod.rs b/src/mastodon_api/statuses/mod.rs
new file mode 100644
index 0000000..a964b01
--- /dev/null
+++ b/src/mastodon_api/statuses/mod.rs
@@ -0,0 +1,2 @@
+pub mod types;
+pub mod views;
diff --git a/src/mastodon_api/statuses/types.rs b/src/mastodon_api/statuses/types.rs
new file mode 100644
index 0000000..5665593
--- /dev/null
+++ b/src/mastodon_api/statuses/types.rs
@@ -0,0 +1,61 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+use crate::mastodon_api::accounts::types::Account;
+use crate::mastodon_api::media::types::Attachment;
+use crate::models::posts::types::{Post, PostCreateData};
+
+/// https://docs.joinmastodon.org/entities/status/
+#[derive(Serialize)]
+pub struct Status {
+    pub id: Uuid,
+    pub created_at: DateTime<Utc>,
+    pub account: Account,
+    pub content: String,
+    pub media_attachments: Vec<Attachment>,
+
+    // Extra fields
+    pub ipfs_cid: Option<String>,
+    pub token_id: Option<i32>,
+    pub token_tx_id: Option<String>,
+}
+
+impl Status {
+    pub fn from_post(post: Post, instance_url: &str) -> Self {
+        let attachments: Vec<Attachment> = post.attachments.into_iter()
+            .map(|item| Attachment::from_db(item, instance_url))
+            .collect();
+        let account = Account::from_profile(post.author, instance_url);
+        Self {
+            id: post.id,
+            created_at: post.created_at,
+            account: account,
+            content: post.content,
+            media_attachments: attachments,
+            ipfs_cid: post.ipfs_cid,
+            token_id: post.token_id,
+            token_tx_id: post.token_tx_id,
+        }
+    }
+}
+
+/// https://docs.joinmastodon.org/methods/statuses/
+#[derive(Deserialize)]
+pub struct StatusData {
+    pub status: String,
+
+    #[serde(rename = "media_ids[]")]
+    pub media_ids: Option<Vec<Uuid>>,
+}
+
+impl From<StatusData> for PostCreateData {
+
+    fn from(value: StatusData) -> Self {
+        Self {
+            content: value.status,
+            attachments: value.media_ids.unwrap_or(vec![]),
+            created_at: None,
+        }
+    }
+}
diff --git a/src/mastodon_api/statuses/views.rs b/src/mastodon_api/statuses/views.rs
new file mode 100644
index 0000000..16ce9f4
--- /dev/null
+++ b/src/mastodon_api/statuses/views.rs
@@ -0,0 +1,159 @@
+use actix_session::Session;
+use actix_web::{get, post, web, HttpResponse, Scope};
+use serde::Serialize;
+use uuid::Uuid;
+
+use crate::activitypub::activity::create_activity_note;
+use crate::activitypub::actor::Actor;
+use crate::activitypub::deliverer::deliver_activity;
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::ethereum::nft::create_mint_signature;
+use crate::ipfs::store as ipfs_store;
+use crate::ipfs::utils::{IPFS_LOGO, get_ipfs_url};
+use crate::mastodon_api::users::auth::get_current_user;
+use crate::models::profiles::queries::get_followers;
+use crate::models::posts::queries::{create_post, get_post_by_id, update_post};
+use crate::models::posts::types::PostCreateData;
+use super::types::{Status, StatusData};
+
+#[post("")]
+async fn create_status(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    data: web::Json<StatusData>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &mut **get_database_client(&db_pool).await?;
+    let current_user = get_current_user(db_client, session).await?;
+    let mut post_data = PostCreateData::from(data.into_inner());
+    post_data.validate()?;
+    let post = create_post(db_client, &current_user.id, post_data).await?;
+    let status = Status::from_post(post.clone(), &config.instance_url());
+    // Federate
+    let activity = create_activity_note(&config, &post);
+    let followers = get_followers(db_client, &current_user.id).await?;
+    let mut recipients: Vec<Actor> = Vec::new();
+    for follower in followers {
+        if let Some(actor_value) = follower.actor_json {
+            // Remote
+            let actor: Actor = serde_json::from_value(actor_value)
+                .map_err(|_| HttpError::InternalError)?;
+            recipients.push(actor);
+        };
+    };
+    actix_rt::spawn(async move {
+        deliver_activity(
+            &config,
+            &current_user,
+            activity,
+            recipients,
+        ).await;
+    });
+    Ok(HttpResponse::Created().json(status))
+}
+
+#[get("/{status_id}")]
+async fn get_status(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    web::Path(status_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let post = get_post_by_id(db_client, &status_id).await?;
+    let status = Status::from_post(post, &config.instance_url());
+    Ok(HttpResponse::Ok().json(status))
+}
+
+// https://docs.opensea.io/docs/metadata-standards
+#[derive(Serialize)]
+struct PostMetadata {
+    name: String,
+    description: String,
+    image: String,
+    external_url: String,
+}
+
+#[post("/{status_id}/make_permanent")]
+async fn make_permanent(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    web::Path(status_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    get_current_user(db_client, session).await?;
+    let mut post = get_post_by_id(db_client, &status_id).await?;
+    let ipfs_api_url = config.ipfs_api_url.as_ref()
+        .ok_or(HttpError::NotSupported)?;
+
+    let post_image_cid = if let Some(attachment) = post.attachments.first() {
+        // Add attachment to IPFS
+        let image_path = config.media_dir().join(&attachment.file_name);
+        let image_data = std::fs::read(image_path)
+            .map_err(|_| HttpError::InternalError)?;
+        let image_cid = ipfs_store::add(&ipfs_api_url, image_data).await
+            .map_err(|_| HttpError::InternalError)?;
+        image_cid
+    } else {
+        // Use IPFS logo if there's no image
+        IPFS_LOGO.to_string()
+    };
+    let post_metadata = PostMetadata {
+        name: format!("Post {}", post.id),
+        description: post.content.clone(),
+        image: get_ipfs_url(&post_image_cid),
+        // TODO: use absolute URL
+        external_url: format!("/post/{}", post.id),
+    };
+    let post_metadata_json = serde_json::to_string(&post_metadata)
+        .map_err(|_| HttpError::InternalError)?
+        .as_bytes().to_vec();
+    let post_metadata_cid = ipfs_store::add(&ipfs_api_url, post_metadata_json).await
+        .map_err(|_| HttpError::InternalError)?;
+
+    // Update post
+    post.ipfs_cid = Some(post_metadata_cid);
+    update_post(db_client, &post).await?;
+    let status = Status::from_post(post, &config.instance_url());
+    Ok(HttpResponse::Ok().json(status))
+}
+
+#[get("/{status_id}/signature")]
+async fn get_signature(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+    web::Path(status_id): web::Path<Uuid>,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let current_user = get_current_user(db_client, session).await?;
+    let contract_config = config.ethereum_contract.as_ref()
+        .ok_or(HttpError::NotSupported)?;
+    let post = get_post_by_id(db_client, &status_id).await?;
+    if post.author.id != current_user.id {
+        // Users can only tokenize their own posts
+        Err(HttpError::NotFoundError("post"))?;
+    }
+    let ipfs_cid = post.ipfs_cid
+        // Post metadata is not immutable
+        .ok_or(HttpError::ValidationError("post is not immutable".into()))?;
+    let token_uri = get_ipfs_url(&ipfs_cid);
+    let signature = create_mint_signature(
+        &contract_config,
+        &current_user.wallet_address,
+        &token_uri,
+    ).map_err(|_| HttpError::InternalError)?;
+    Ok(HttpResponse::Ok().json(signature))
+}
+
+pub fn status_api_scope() -> Scope {
+    web::scope("/api/v1/statuses")
+        // Routes without status ID
+        .service(create_status)
+        // Routes with status ID
+        .service(get_status)
+        .service(make_permanent)
+        .service(get_signature)
+}
diff --git a/src/mastodon_api/timelines/mod.rs b/src/mastodon_api/timelines/mod.rs
new file mode 100644
index 0000000..38b4403
--- /dev/null
+++ b/src/mastodon_api/timelines/mod.rs
@@ -0,0 +1 @@
+pub mod views;
diff --git a/src/mastodon_api/timelines/views.rs b/src/mastodon_api/timelines/views.rs
new file mode 100644
index 0000000..a71baa6
--- /dev/null
+++ b/src/mastodon_api/timelines/views.rs
@@ -0,0 +1,24 @@
+use actix_session::Session;
+use actix_web::{get, web, HttpResponse};
+
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::mastodon_api::statuses::types::Status;
+use crate::mastodon_api::users::auth::get_current_user;
+use crate::models::posts::queries::get_posts;
+
+#[get("/api/v1/timelines/home")]
+pub async fn home_timeline(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let current_user = get_current_user(db_client, session).await?;
+    let statuses: Vec<Status> = get_posts(db_client, &current_user.id).await?
+        .into_iter()
+        .map(|post| Status::from_post(post, &config.instance_url()))
+        .collect();
+    Ok(HttpResponse::Ok().json(statuses))
+}
diff --git a/src/mastodon_api/users/auth.rs b/src/mastodon_api/users/auth.rs
new file mode 100644
index 0000000..d8e2f04
--- /dev/null
+++ b/src/mastodon_api/users/auth.rs
@@ -0,0 +1,25 @@
+use actix_session::Session;
+use tokio_postgres::GenericClient;
+use uuid::Uuid;
+
+use crate::errors::HttpError;
+use crate::models::users::queries::get_user_by_id;
+use crate::models::users::types::User;
+
+pub async fn get_current_user(
+    db_client: &impl GenericClient,
+    session: Session,
+) -> Result<User, HttpError> {
+    let maybe_user_id = session.get::<String>("id")
+        .map_err(|_| HttpError::SessionError("failed to read cookie"))?;
+    if let Some(user_id) = maybe_user_id {
+        let user_uuid = Uuid::parse_str(&user_id)
+            .map_err(|_| HttpError::SessionError("invalid uuid"))?;
+        let user = get_user_by_id(db_client, &user_uuid)
+            .await
+            .map_err(|_| HttpError::SessionError("user not found"))?;
+        Ok(user)
+    } else {
+        return Err(HttpError::SessionError("session not found"));
+    }
+}
diff --git a/src/mastodon_api/users/mod.rs b/src/mastodon_api/users/mod.rs
new file mode 100644
index 0000000..70b7922
--- /dev/null
+++ b/src/mastodon_api/users/mod.rs
@@ -0,0 +1,3 @@
+pub mod auth;
+mod types;
+pub mod views;
diff --git a/src/mastodon_api/users/types.rs b/src/mastodon_api/users/types.rs
new file mode 100644
index 0000000..df5732d
--- /dev/null
+++ b/src/mastodon_api/users/types.rs
@@ -0,0 +1,24 @@
+use serde::Serialize;
+use uuid::Uuid;
+
+use crate::mastodon_api::accounts::types::Account;
+use crate::models::users::types::User;
+
+// TODO: use Account instead
+#[derive(Serialize)]
+pub struct ApiUser {
+    pub id: Uuid,
+    pub profile: Account,
+    pub wallet_address: String,
+}
+
+impl ApiUser {
+    pub fn from_user(user: User, instance_url: &str) -> Self {
+        let account = Account::from_profile(user.profile, instance_url);
+        Self {
+            id: user.id,
+            profile: account,
+            wallet_address: user.wallet_address,
+        }
+    }
+}
diff --git a/src/mastodon_api/users/views.rs b/src/mastodon_api/users/views.rs
new file mode 100644
index 0000000..abba684
--- /dev/null
+++ b/src/mastodon_api/users/views.rs
@@ -0,0 +1,105 @@
+use actix_session::Session;
+use actix_web::{
+    get, post, web,
+    HttpResponse,
+};
+
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::{HttpError, ValidationError};
+use crate::models::users::queries::{
+    is_valid_invite_code,
+    create_user,
+    get_user_by_wallet_address,
+};
+use crate::models::users::types::{
+    UserRegistrationData,
+    UserLoginData,
+};
+use crate::utils::crypto::{
+    hash_password,
+    verify_password,
+    generate_private_key,
+    serialize_private_key,
+};
+use super::auth::get_current_user;
+use super::types::ApiUser;
+
+// /api/v1/accounts
+#[post("/api/v0/create")]
+async fn create_user_view(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    form: web::Json<UserRegistrationData>,
+    session: Session,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &mut **get_database_client(&db_pool).await?;
+    // Validate
+    form.clean()?;
+    if !config.registrations_open {
+        let invite_code = form.invite_code.as_ref()
+            .ok_or(ValidationError("invite code is required"))?;
+        if !is_valid_invite_code(db_client, &invite_code).await? {
+            Err(ValidationError("invalid invite code"))?;
+        }
+    }
+    // Hash password and generate private key
+    let password_hash = hash_password(&form.signature)
+        .map_err(|_| HttpError::InternalError)?;
+    let private_key = match web::block(move || generate_private_key()).await {
+        Ok(private_key) => private_key,
+        Err(_) => return Err(HttpError::InternalError),
+    };
+    let private_key_pem = serialize_private_key(private_key)
+        .map_err(|_| HttpError::InternalError)?;
+
+    let user = create_user(
+        db_client,
+        form.into_inner(),
+        password_hash,
+        private_key_pem,
+    ).await?;
+    session.set("id", user.id)?;
+    let api_user = ApiUser::from_user(user, &config.instance_url());
+    Ok(HttpResponse::Created().json(api_user))
+}
+
+#[post("/api/v0/login")]
+async fn login_view(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    form: web::Json<UserLoginData>,
+    session: Session,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let user = get_user_by_wallet_address(db_client, &form.wallet_address).await?;
+    let result = verify_password(&user.password_hash, &form.signature)
+        .map_err(|_| ValidationError("incorrect password"))?;
+    if !result {
+        // Invalid signature/password
+        Err(ValidationError("incorrect password"))?;
+    }
+    session.set("id", &user.id)?;
+    let api_user = ApiUser::from_user(user, &config.instance_url());
+    Ok(HttpResponse::Ok().json(api_user))
+}
+
+#[get("/api/v0/current-user")]
+async fn current_user_view(
+    config: web::Data<Config>,
+    db_pool: web::Data<Pool>,
+    session: Session,
+) -> Result<HttpResponse, HttpError> {
+    let db_client = &**get_database_client(&db_pool).await?;
+    let user = get_current_user(db_client, session).await?;
+    let api_user = ApiUser::from_user(user, &config.instance_url());
+    Ok(HttpResponse::Ok().json(api_user))
+}
+
+#[post("/api/v0/logout")]
+async fn logout_view(
+    session: Session,
+) -> Result<HttpResponse, HttpError> {
+    session.clear();
+    Ok(HttpResponse::Ok().body("logged out"))
+}
diff --git a/src/models/attachments/mod.rs b/src/models/attachments/mod.rs
new file mode 100644
index 0000000..0333ab5
--- /dev/null
+++ b/src/models/attachments/mod.rs
@@ -0,0 +1,2 @@
+pub mod queries;
+pub mod types;
diff --git a/src/models/attachments/queries.rs b/src/models/attachments/queries.rs
new file mode 100644
index 0000000..dc57659
--- /dev/null
+++ b/src/models/attachments/queries.rs
@@ -0,0 +1,24 @@
+use tokio_postgres::GenericClient;
+use uuid::Uuid;
+
+use crate::errors::DatabaseError;
+use super::types::DbMediaAttachment;
+
+pub async fn create_attachment(
+    db_client: &impl GenericClient,
+    owner_id: &Uuid,
+    media_type: Option<String>,
+    file_name: String,
+) -> Result<DbMediaAttachment, DatabaseError> {
+    let attachment_id = Uuid::new_v4();
+    let inserted_row = db_client.query_one(
+        "
+        INSERT INTO media_attachment (id, owner_id, media_type, file_name)
+        VALUES ($1, $2, $3, $4)
+        RETURNING media_attachment
+        ",
+        &[&attachment_id, &owner_id, &media_type, &file_name],
+    ).await?;
+    let db_attachment: DbMediaAttachment = inserted_row.try_get("media_attachment")?;
+    Ok(db_attachment)
+}
diff --git a/src/models/attachments/types.rs b/src/models/attachments/types.rs
new file mode 100644
index 0000000..89aa871
--- /dev/null
+++ b/src/models/attachments/types.rs
@@ -0,0 +1,34 @@
+use chrono::{DateTime, Utc};
+use postgres_types::FromSql;
+use uuid::Uuid;
+
+#[derive(Clone, FromSql)]
+#[postgres(name = "media_attachment")]
+pub struct DbMediaAttachment {
+    pub id: Uuid,
+    pub owner_id: Uuid,
+    pub media_type: Option<String>,
+    pub file_name: String,
+    pub post_id: Option<Uuid>,
+    pub created_at: DateTime<Utc>,
+}
+
+pub enum AttachmentType {
+    Unknown,
+    Image,
+}
+
+impl AttachmentType {
+    pub fn from_media_type(value: Option<String>) -> Self {
+        match value {
+            Some(media_type) => {
+                if media_type.starts_with("image/") {
+                    Self::Image
+                } else {
+                    Self::Unknown
+                }
+            },
+            None => Self::Unknown,
+        }
+    }
+}
diff --git a/src/models/mod.rs b/src/models/mod.rs
new file mode 100644
index 0000000..72f013f
--- /dev/null
+++ b/src/models/mod.rs
@@ -0,0 +1,5 @@
+pub mod attachments;
+pub mod posts;
+pub mod profiles;
+pub mod relationships;
+pub mod users;
diff --git a/src/models/posts/mod.rs b/src/models/posts/mod.rs
new file mode 100644
index 0000000..0333ab5
--- /dev/null
+++ b/src/models/posts/mod.rs
@@ -0,0 +1,2 @@
+pub mod queries;
+pub mod types;
diff --git a/src/models/posts/queries.rs b/src/models/posts/queries.rs
new file mode 100644
index 0000000..4b86406
--- /dev/null
+++ b/src/models/posts/queries.rs
@@ -0,0 +1,207 @@
+use std::convert::TryFrom;
+
+use chrono::Utc;
+use tokio_postgres::GenericClient;
+use uuid::Uuid;
+
+use crate::errors::DatabaseError;
+use crate::models::attachments::types::DbMediaAttachment;
+use crate::models::profiles::queries::update_post_count;
+use super::types::{DbPost, Post, PostCreateData};
+
+pub async fn get_posts(
+    db_client: &impl GenericClient,
+    current_user_id: &Uuid,
+) -> Result<Vec<Post>, DatabaseError> {
+    // Select posts from follows + own posts
+    let rows = db_client.query(
+        "
+        SELECT
+            post, actor_profile,
+            ARRAY(
+                SELECT media_attachment
+                FROM media_attachment WHERE post_id = post.id
+            ) AS attachments
+        FROM post
+        JOIN actor_profile ON post.author_id = actor_profile.id
+        WHERE
+            post.author_id = $1
+            OR EXISTS (
+                SELECT 1 FROM relationship
+                WHERE source_id = $1 AND target_id = post.author_id
+            )
+        ORDER BY post.created_at DESC
+        ",
+        &[&current_user_id],
+    ).await?;
+    let posts: Vec<Post> = rows.iter()
+        .map(|row| Post::try_from(row))
+        .collect::<Result<_, _>>()?;
+    Ok(posts)
+}
+
+pub async fn get_posts_by_author(
+    db_client: &impl GenericClient,
+    account_id: &Uuid,
+) -> Result<Vec<Post>, DatabaseError> {
+    let rows = db_client.query(
+        "
+        SELECT
+            post, actor_profile,
+            ARRAY(
+                SELECT media_attachment
+                FROM media_attachment WHERE post_id = post.id
+            ) AS attachments
+        FROM post
+        JOIN actor_profile ON post.author_id = actor_profile.id
+        WHERE
+            post.author_id = $1
+        ORDER BY post.created_at DESC
+        ",
+        &[&account_id],
+    ).await?;
+    let posts: Vec<Post> = rows.iter()
+        .map(|row| Post::try_from(row))
+        .collect::<Result<_, _>>()?;
+    Ok(posts)
+}
+
+pub async fn create_post(
+    db_client: &mut impl GenericClient,
+    author_id: &Uuid,
+    data: PostCreateData,
+) -> Result<Post, DatabaseError> {
+    let transaction = db_client.transaction().await?;
+    let post_id = uuid::Uuid::new_v4();
+    let created_at = data.created_at.unwrap_or(Utc::now());
+    let post_row = transaction.query_one(
+        "
+        INSERT INTO post (id, author_id, content, created_at)
+        VALUES ($1, $2, $3, $4)
+        RETURNING post
+        ",
+        &[&post_id, &author_id, &data.content, &created_at],
+    ).await?;
+    let attachment_rows = transaction.query(
+        "
+        UPDATE media_attachment
+        SET post_id = $1
+        WHERE id = ANY($2)
+        RETURNING media_attachment
+        ",
+        &[&post_id, &data.attachments],
+    ).await?;
+    let db_attachments: Vec<DbMediaAttachment> = attachment_rows.iter()
+        .map(|row| -> Result<DbMediaAttachment, tokio_postgres::Error> {
+            row.try_get("media_attachment")
+        })
+        .collect::<Result<_, _>>()?;
+    let db_post: DbPost = post_row.try_get("post")?;
+    let author = update_post_count(&transaction, &db_post.author_id, 1).await?;
+    transaction.commit().await?;
+    let post = Post {
+        id: db_post.id,
+        author: author,
+        content: db_post.content,
+        attachments: db_attachments,
+        ipfs_cid: db_post.ipfs_cid,
+        token_id: db_post.token_id,
+        token_tx_id: db_post.token_tx_id,
+        created_at: db_post.created_at,
+    };
+    Ok(post)
+}
+
+pub async fn get_post_by_id(
+    db_client: &impl GenericClient,
+    post_id: &Uuid,
+) -> Result<Post, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT
+            post, actor_profile,
+            ARRAY(
+                SELECT media_attachment
+                FROM media_attachment WHERE post_id = post.id
+            ) AS attachments
+        FROM post
+        JOIN actor_profile ON post.author_id = actor_profile.id
+        WHERE post.id = $1
+        ",
+        &[&post_id],
+    ).await?;
+    let post = match maybe_row {
+        Some(row) => Post::try_from(&row)?,
+        None => return Err(DatabaseError::NotFound("post")),
+    };
+    Ok(post)
+}
+
+pub async fn get_post_by_ipfs_cid(
+    db_client: &impl GenericClient,
+    ipfs_cid: &str,
+) -> Result<Post, DatabaseError> {
+    let result = db_client.query_opt(
+        "
+        SELECT
+            post, actor_profile,
+            ARRAY(
+                SELECT media_attachment
+                FROM media_attachment WHERE post_id = post.id
+            ) AS attachments
+        FROM post
+        JOIN actor_profile ON post.author_id = actor_profile.id
+        WHERE post.ipfs_cid = $1
+        ",
+        &[&ipfs_cid],
+    ).await?;
+    let post = match result {
+        Some(row) => Post::try_from(&row)?,
+        None => return Err(DatabaseError::NotFound("post")),
+    };
+    Ok(post)
+}
+
+pub async fn update_post(
+    db_client: &impl GenericClient,
+    post: &Post,
+) -> Result<(), DatabaseError> {
+    // TODO: create PostUpdateData type
+    let updated_count = db_client.execute(
+        "
+        UPDATE post
+        SET
+            content = $1,
+            ipfs_cid = $2,
+            token_id = $3,
+            token_tx_id = $4
+        WHERE id = $5
+        ",
+        &[
+            &post.content,
+            &post.ipfs_cid,
+            &post.token_id,
+            &post.token_tx_id,
+            &post.id,
+        ],
+    ).await?;
+    if updated_count == 0 {
+        return Err(DatabaseError::NotFound("post"));
+    }
+    Ok(())
+}
+
+pub async fn is_waiting_for_token(
+    db_client: &impl GenericClient,
+) -> Result<bool, DatabaseError> {
+    let row = db_client.query_one(
+        "
+        SELECT count(post) > 0 AS is_waiting
+        FROM post
+        WHERE ipfs_cid IS NOT NULL AND token_id IS NULL
+        ",
+        &[],
+    ).await?;
+    let is_waiting: bool = row.try_get("is_waiting")?;
+    Ok(is_waiting)
+}
diff --git a/src/models/posts/types.rs b/src/models/posts/types.rs
new file mode 100644
index 0000000..8f0ba04
--- /dev/null
+++ b/src/models/posts/types.rs
@@ -0,0 +1,102 @@
+use std::convert::TryFrom;
+
+use chrono::{DateTime, Utc};
+use postgres_types::FromSql;
+use tokio_postgres::Row;
+use uuid::Uuid;
+
+use crate::errors::ValidationError;
+use crate::models::attachments::types::DbMediaAttachment;
+use crate::models::profiles::types::DbActorProfile;
+use crate::utils::html::clean_html;
+
+#[derive(FromSql)]
+#[postgres(name = "post")]
+pub struct DbPost {
+    pub id: Uuid,
+    pub author_id: Uuid,
+    pub content: String,
+    pub ipfs_cid: Option<String>,
+    pub token_id: Option<i32>,
+    pub token_tx_id: Option<String>,
+    pub created_at: DateTime<Utc>,
+}
+
+#[derive(Clone)]
+pub struct Post {
+    pub id: Uuid,
+    pub author: DbActorProfile,
+    pub content: String,
+    pub attachments: Vec<DbMediaAttachment>,
+    pub ipfs_cid: Option<String>,
+    pub token_id: Option<i32>,
+    pub token_tx_id: Option<String>,
+    pub created_at: DateTime<Utc>,
+}
+
+impl TryFrom<&Row> for Post {
+
+    type Error = tokio_postgres::Error;
+
+    fn try_from(row: &Row) -> Result<Self, Self::Error> {
+        let db_post: DbPost = row.try_get("post")?;
+        let db_profile: DbActorProfile = row.try_get("actor_profile")?;
+        let db_attachments: Vec<DbMediaAttachment> = row.try_get("attachments")?;
+        let post = Post {
+            id: db_post.id,
+            author: db_profile,
+            content: db_post.content,
+            attachments: db_attachments,
+            ipfs_cid: db_post.ipfs_cid,
+            token_id: db_post.token_id,
+            token_tx_id: db_post.token_tx_id,
+            created_at: db_post.created_at,
+        };
+        Ok(post)
+    }
+}
+
+pub struct PostCreateData {
+    pub content: String,
+    pub attachments: Vec<Uuid>,
+    pub created_at: Option<DateTime<Utc>>,
+}
+
+impl PostCreateData {
+    /// Validate and clean post data.
+    pub fn validate(&mut self) -> Result<(), ValidationError> {
+        let content_safe = clean_html(&self.content);
+        let content_trimmed = content_safe.trim();
+        if content_trimmed == "" {
+            return Err(ValidationError("post can not be empty"));
+        }
+        self.content = content_trimmed.to_string();
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_validate_post_data() {
+        let mut post_data_1 = PostCreateData {
+            content: "  ".to_string(),
+            attachments: vec![],
+            created_at: None,
+        };
+        assert_eq!(post_data_1.validate().is_ok(), false);
+    }
+
+    #[test]
+    fn test_trimming() {
+        let mut post_data_2 = PostCreateData {
+            content: "test ".to_string(),
+            attachments: vec![],
+            created_at: None,
+        };
+        assert_eq!(post_data_2.validate().is_ok(), true);
+        assert_eq!(post_data_2.content.as_str(), "test");
+    }
+}
diff --git a/src/models/profiles/mod.rs b/src/models/profiles/mod.rs
new file mode 100644
index 0000000..0333ab5
--- /dev/null
+++ b/src/models/profiles/mod.rs
@@ -0,0 +1,2 @@
+pub mod queries;
+pub mod types;
diff --git a/src/models/profiles/queries.rs b/src/models/profiles/queries.rs
new file mode 100644
index 0000000..459e9ff
--- /dev/null
+++ b/src/models/profiles/queries.rs
@@ -0,0 +1,272 @@
+use tokio_postgres::GenericClient;
+use uuid::Uuid;
+
+use crate::errors::DatabaseError;
+use super::types::{DbActorProfile, ProfileCreateData, ProfileUpdateData};
+
+/// Create new profile using given Client or Transaction.
+pub async fn create_profile(
+    db_client: &impl GenericClient,
+    profile_data: &ProfileCreateData,
+) -> Result<DbActorProfile, DatabaseError> {
+    let profile_id = Uuid::new_v4();
+    let result = db_client.query_one(
+        "
+        INSERT INTO actor_profile (
+            id, username, display_name, acct, bio, bio_source,
+            avatar_file_name, banner_file_name,
+            actor_json
+        )
+        VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
+        RETURNING actor_profile
+        ",
+        &[
+            &profile_id,
+            &profile_data.username,
+            &profile_data.display_name,
+            &profile_data.acct,
+            &profile_data.bio,
+            &profile_data.bio,
+            &profile_data.avatar,
+            &profile_data.banner,
+            &profile_data.actor,
+        ],
+    ).await;
+    let profile = match result {
+        Ok(row) => row.try_get("actor_profile")?,
+        Err(err) => {
+            // TODO: catch profile already exists error
+            log::warn!("{}", err);
+            return Err(DatabaseError::AlreadyExists("profile"));
+        },
+    };
+    Ok(profile)
+}
+
+pub async fn update_profile(
+    db_client: &impl GenericClient,
+    profile_id: &Uuid,
+    data: ProfileUpdateData,
+) -> Result<DbActorProfile, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        UPDATE actor_profile
+        SET
+            display_name = $1,
+            bio = $2,
+            bio_source = $3,
+            avatar_file_name = $4,
+            banner_file_name = $5
+        WHERE id = $6
+        RETURNING actor_profile
+        ",
+        &[
+            &data.display_name,
+            &data.bio,
+            &data.bio_source,
+            &data.avatar,
+            &data.banner,
+            &profile_id,
+        ],
+    ).await?;
+    let profile = match maybe_row {
+        Some(row) => row.try_get("actor_profile")?,
+        None => return Err(DatabaseError::NotFound("profile")),
+    };
+    Ok(profile)
+}
+
+pub async fn get_profile_by_id(
+    db_client: &impl GenericClient,
+    profile_id: &Uuid,
+) -> Result<DbActorProfile, DatabaseError> {
+    let result = db_client.query_opt(
+        "
+        SELECT actor_profile
+        FROM actor_profile
+        WHERE id = $1
+        ",
+        &[&profile_id],
+    ).await?;
+    let profile = match result {
+        Some(row) => row.try_get("actor_profile")?,
+        None => return Err(DatabaseError::NotFound("profile")),
+    };
+    Ok(profile)
+}
+
+pub async fn get_profile_by_actor_id(
+    db_client: &impl GenericClient,
+    actor_id: &str,
+) -> Result<DbActorProfile, DatabaseError> {
+    let result = db_client.query_opt(
+        "
+        SELECT actor_profile
+        FROM actor_profile
+        WHERE actor_profile.actor_json ->> 'id' = $1
+        ",
+        &[&actor_id],
+    ).await?;
+    let profile = match result {
+        Some(row) => row.try_get("actor_profile")?,
+        None => return Err(DatabaseError::NotFound("profile")),
+    };
+    Ok(profile)
+}
+
+pub async fn get_profile_by_acct(
+    db_client: &impl GenericClient,
+    account_uri: &str,
+) -> Result<DbActorProfile, DatabaseError> {
+    let result = db_client.query_opt(
+        "
+        SELECT actor_profile
+        FROM actor_profile
+        WHERE actor_profile.acct = $1
+        ",
+        &[&account_uri],
+    ).await?;
+    let profile = match result {
+        Some(row) => row.try_get("actor_profile")?,
+        None => return Err(DatabaseError::NotFound("profile")),
+    };
+    Ok(profile)
+}
+
+pub async fn get_profiles(
+    db_client: &impl GenericClient,
+) -> Result<Vec<DbActorProfile>, DatabaseError> {
+    let rows = db_client.query(
+        "
+        SELECT actor_profile
+        FROM actor_profile
+        ORDER BY username
+        ",
+        &[],
+    ).await?;
+    let profiles = rows.iter()
+        .map(|row| row.try_get("actor_profile"))
+        .collect::<Result<Vec<DbActorProfile>, _>>()?;
+    Ok(profiles)
+}
+
+pub async fn get_followers(
+    db_client: &impl GenericClient,
+    profile_id: &Uuid,
+) -> Result<Vec<DbActorProfile>, DatabaseError> {
+    let rows = db_client.query(
+        "
+        SELECT actor_profile
+        FROM actor_profile
+        JOIN relationship
+        ON (actor_profile.id = relationship.source_id)
+        WHERE relationship.target_id = $1
+        ",
+        &[&profile_id],
+    ).await?;
+    let profiles = rows.iter()
+        .map(|row| row.try_get("actor_profile"))
+        .collect::<Result<Vec<DbActorProfile>, _>>()?;
+    Ok(profiles)
+}
+
+pub async fn delete_profile(
+    db_client: &impl GenericClient,
+    profile_id: &Uuid,
+) -> Result<(), DatabaseError> {
+    let deleted_count = db_client.execute(
+        "DELETE FROM actor_profile WHERE id = $1",
+        &[&profile_id],
+    ).await?;
+    if deleted_count == 0 {
+        return Err(DatabaseError::NotFound("profile"));
+    }
+    Ok(())
+}
+
+pub async fn search_profile(
+    db_client: &impl GenericClient,
+    username: &String,
+    instance: &Option<String>,
+) -> Result<Vec<DbActorProfile>, DatabaseError> {
+    let db_search_query = match &instance {
+        Some(instance) => {
+            // Search for exact profile name.
+            // Fetch from remote server if not found
+            format!("{}@{}", username, instance)
+        },
+        None => {
+            // Search for username
+            format!("%{}%", username)
+        },
+    };
+    let rows = db_client.query(
+        "
+        SELECT actor_profile
+        FROM actor_profile
+        WHERE acct LIKE $1
+        ",
+        &[&db_search_query],
+    ).await?;
+    let profiles: Vec<DbActorProfile> = rows.iter()
+        .map(|row| row.try_get("actor_profile"))
+        .collect::<Result<_, _>>()?;
+    Ok(profiles)
+}
+
+pub async fn update_follower_count(
+    db_client: &impl GenericClient,
+    profile_id: &Uuid,
+    change: i32,
+) -> Result<DbActorProfile, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        UPDATE actor_profile
+        SET follower_count = follower_count + $1
+        WHERE id = $2
+        RETURNING actor_profile
+        ",
+        &[&change, &profile_id],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("profile"))?;
+    let profile = row.try_get("actor_profile")?;
+    Ok(profile)
+}
+
+pub async fn update_following_count(
+    db_client: &impl GenericClient,
+    profile_id: &Uuid,
+    change: i32,
+) -> Result<DbActorProfile, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        UPDATE actor_profile
+        SET following_count = following_count + $1
+        WHERE id = $2
+        RETURNING actor_profile
+        ",
+        &[&change, &profile_id],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("profile"))?;
+    let profile = row.try_get("actor_profile")?;
+    Ok(profile)
+}
+
+pub async fn update_post_count(
+    db_client: &impl GenericClient,
+    profile_id: &Uuid,
+    change: i32,
+) -> Result<DbActorProfile, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        UPDATE actor_profile
+        SET post_count = post_count + $1
+        WHERE id = $2
+        RETURNING actor_profile
+        ",
+        &[&change, &profile_id],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("profile"))?;
+    let profile = row.try_get("actor_profile")?;
+    Ok(profile)
+}
diff --git a/src/models/profiles/types.rs b/src/models/profiles/types.rs
new file mode 100644
index 0000000..c6565f7
--- /dev/null
+++ b/src/models/profiles/types.rs
@@ -0,0 +1,51 @@
+use chrono::{DateTime, Utc};
+use postgres_types::FromSql;
+use serde_json::Value;
+use uuid::Uuid;
+
+use crate::errors::ValidationError;
+use crate::utils::html::clean_html;
+
+#[derive(Clone, FromSql)]
+#[postgres(name = "actor_profile")]
+pub struct DbActorProfile {
+    pub id: Uuid,
+    pub username: String,
+    pub acct: String,
+    pub display_name: Option<String>,
+    pub bio: Option<String>, // html
+    pub bio_source: Option<String>, // plaintext or markdown
+    pub avatar_file_name: Option<String>,
+    pub banner_file_name: Option<String>,
+    pub follower_count: i32,
+    pub following_count: i32,
+    pub post_count: i32,
+    pub created_at: DateTime<Utc>,
+    pub actor_json: Option<Value>,
+}
+
+pub struct ProfileCreateData {
+    pub username: String,
+    pub display_name: Option<String>,
+    pub acct: String,
+    pub bio: Option<String>,
+    pub avatar: Option<String>,
+    pub banner: Option<String>,
+    pub actor: Option<Value>,
+}
+
+pub struct ProfileUpdateData {
+    pub display_name: Option<String>,
+    pub bio: Option<String>,
+    pub bio_source: Option<String>,
+    pub avatar: Option<String>,
+    pub banner: Option<String>,
+}
+
+impl ProfileUpdateData {
+    /// Validate and clean bio.
+    pub fn clean(&mut self) -> Result<(), ValidationError> {
+        self.bio = self.bio.as_ref().map(|val| clean_html(val));
+        Ok(())
+    }
+}
diff --git a/src/models/relationships/mod.rs b/src/models/relationships/mod.rs
new file mode 100644
index 0000000..0333ab5
--- /dev/null
+++ b/src/models/relationships/mod.rs
@@ -0,0 +1,2 @@
+pub mod queries;
+pub mod types;
diff --git a/src/models/relationships/queries.rs b/src/models/relationships/queries.rs
new file mode 100644
index 0000000..4138839
--- /dev/null
+++ b/src/models/relationships/queries.rs
@@ -0,0 +1,230 @@
+use std::convert::TryFrom;
+
+use tokio_postgres::GenericClient;
+use uuid::Uuid;
+
+use crate::errors::DatabaseError;
+use crate::models::profiles::queries::{
+    update_follower_count,
+    update_following_count,
+};
+use super::types::{
+    DbFollowRequest,
+    FollowRequest,
+    FollowRequestStatus,
+    Relationship,
+};
+
+pub async fn get_relationships(
+    db_client: &impl GenericClient,
+    source_id: Uuid,
+    target_ids: Vec<Uuid>,
+) -> Result<Vec<Relationship>, DatabaseError> {
+    let rows = db_client.query(
+        "
+        SELECT
+            actor_profile.id,
+            EXISTS (
+                SELECT 1 FROM relationship
+                WHERE source_id = $1 AND target_id = actor_profile.id
+            ) AS following,
+            EXISTS (
+                SELECT 1 FROM relationship
+                WHERE source_id = actor_profile.id AND target_id = $1
+            ) AS followed_by,
+            EXISTS (
+                SELECT 1 FROM follow_request
+                WHERE source_id = $1 AND target_id = actor_profile.id
+                    AND request_status = 1
+            ) AS requested
+        FROM actor_profile
+        WHERE actor_profile.id = ANY($2)
+        ",
+        &[&source_id, &target_ids],
+    ).await?;
+    let relationships = rows.iter()
+        .map(|row| Relationship::try_from(row))
+        .collect::<Result<_, _>>()?;
+    Ok(relationships)
+}
+
+pub async fn get_relationship(
+    db_client: &impl GenericClient,
+    source_id: &Uuid,
+    target_id: &Uuid,
+) -> Result<Relationship, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT
+            actor_profile.id,
+            EXISTS (
+                SELECT 1 FROM relationship
+                WHERE source_id = $1 AND target_id = actor_profile.id
+            ) AS following,
+            EXISTS (
+                SELECT 1 FROM relationship
+                WHERE source_id = actor_profile.id AND target_id = $1
+            ) AS followed_by,
+            EXISTS (
+                SELECT 1 FROM follow_request
+                WHERE source_id = $1 AND target_id = actor_profile.id
+                    AND request_status = 1
+            ) AS requested
+        FROM actor_profile
+        WHERE actor_profile.id = $2
+        ",
+        &[&source_id, &target_id],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("profile"))?;
+    let relationship = Relationship::try_from(&row)?;
+    Ok(relationship)
+}
+
+pub async fn follow(
+    db_client: &mut impl GenericClient,
+    source_id: &Uuid,
+    target_id: &Uuid,
+) -> Result<Relationship, DatabaseError> {
+    let transaction = db_client.transaction().await?;
+    let result = transaction.execute(
+        "
+        INSERT INTO relationship (source_id, target_id)
+        VALUES ($1, $2)
+        ",
+        &[&source_id, &target_id],
+    ).await;
+    if let Err(err) = result {
+        log::info!("{}", err);
+        return Err(DatabaseError::AlreadyExists("relationship"));
+    };
+    update_follower_count(&transaction, target_id, 1).await?;
+    update_following_count(&transaction, source_id, 1).await?;
+    let relationship = get_relationship(&transaction, source_id, target_id).await?;
+    transaction.commit().await?;
+    Ok(relationship)
+}
+
+pub async fn unfollow(
+    db_client: &mut impl GenericClient,
+    source_id: &Uuid,
+    target_id: &Uuid,
+) -> Result<Relationship, DatabaseError> {
+    let transaction = db_client.transaction().await?;
+    let deleted_count = transaction.execute(
+        "
+        DELETE FROM relationship
+        WHERE source_id = $1 AND target_id = $2
+        ",
+        &[&source_id, &target_id],
+    ).await?;
+    if deleted_count == 0 {
+        // Relationship not found, try to delete follow request
+        let follow_request_deleted = delete_follow_request(
+            &transaction,
+            source_id,
+            target_id,
+        ).await?;
+        if !follow_request_deleted {
+            return Err(DatabaseError::NotFound("relationship"));
+        }
+    } else {
+        // Update counters only if relationship exists
+        update_follower_count(&transaction, target_id, -1).await?;
+        update_following_count(&transaction, source_id, -1).await?;
+    }
+    let relationship = get_relationship(&transaction, source_id, target_id).await?;
+    transaction.commit().await?;
+    Ok(relationship)
+}
+
+pub async fn create_follow_request(
+    db_client: &impl GenericClient,
+    source_id: &Uuid,
+    target_id: &Uuid,
+) -> Result<FollowRequest, DatabaseError> {
+    let request = FollowRequest {
+        id: Uuid::new_v4(),
+        source_id: source_id.to_owned(),
+        target_id: target_id.to_owned(),
+        status: FollowRequestStatus::Pending,
+    };
+    db_client.execute(
+        "
+        INSERT INTO follow_request (
+            id, source_id, target_id, request_status
+        )
+        VALUES ($1, $2, $3, $4)
+        ",
+        &[
+            &request.id,
+            &request.source_id,
+            &request.target_id,
+            &i16::from(request.status.clone()),
+        ],
+    ).await?;
+    Ok(request)
+}
+
+pub async fn accept_follow_request(
+    db_client: &mut impl GenericClient,
+    request_id: &Uuid,
+) -> Result<(), DatabaseError> {
+    let mut transaction = db_client.transaction().await?;
+    let status_sql = i16::from(FollowRequestStatus::Accepted);
+    let maybe_row = transaction.query_opt(
+        "
+        UPDATE follow_request
+        SET request_status = $1
+        WHERE id = $2
+        RETURNING source_id, target_id
+        ",
+        &[&status_sql, &request_id],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("follow request"))?;
+    let source_id: Uuid = row.try_get("source_id")?;
+    let target_id: Uuid = row.try_get("target_id")?;
+    follow(&mut transaction, &source_id, &target_id).await?;
+    transaction.commit().await?;
+    Ok(())
+}
+
+pub async fn delete_follow_request(
+    db_client: &impl GenericClient,
+    source_id: &Uuid,
+    target_id: &Uuid,
+) -> Result<bool, DatabaseError> {
+    let deleted_count = db_client.execute(
+        "
+        DELETE FROM follow_request
+        WHERE source_id = $1 AND target_id = $2
+        ",
+        &[&source_id, &target_id],
+    ).await?;
+    let is_success = deleted_count > 0;
+    Ok(is_success)
+}
+
+pub async fn get_follow_request_by_path(
+    db_client: &impl GenericClient,
+    source_id: &Uuid,
+    target_id: &Uuid,
+) -> Result<FollowRequest, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT follow_request
+        FROM follow_request
+        WHERE source_id = $1 AND target_id = $2
+        ",
+        &[&source_id, &target_id],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("follow request"))?;
+    let db_request: DbFollowRequest = row.try_get("follow_request")?;
+    let request_status = FollowRequestStatus::try_from(db_request.request_status)?;
+    let request = FollowRequest {
+        id: db_request.id,
+        source_id: db_request.source_id,
+        target_id: db_request.target_id,
+        status: request_status,
+    };
+    Ok(request)
+}
diff --git a/src/models/relationships/types.rs b/src/models/relationships/types.rs
new file mode 100644
index 0000000..65b7fd1
--- /dev/null
+++ b/src/models/relationships/types.rs
@@ -0,0 +1,78 @@
+use std::convert::TryFrom;
+
+use postgres_types::FromSql;
+use serde::Serialize;
+use tokio_postgres::Row;
+use uuid::Uuid;
+
+use crate::errors::ConversionError;
+
+#[derive(Serialize)]
+pub struct Relationship {
+    pub id: Uuid,
+    pub following: bool,
+    pub followed_by: bool,
+    pub requested: bool,
+}
+
+impl TryFrom<&Row> for Relationship {
+
+    type Error = tokio_postgres::Error;
+
+    fn try_from(row: &Row) -> Result<Self, Self::Error> {
+        let relationship = Relationship {
+            id: row.try_get("id")?,
+            following: row.try_get("following")?,
+            followed_by: row.try_get("followed_by")?,
+            requested: row.try_get("requested")?,
+        };
+        Ok(relationship)
+    }
+}
+
+#[derive(Clone, PartialEq)]
+pub enum FollowRequestStatus {
+    Pending,
+    Accepted,
+    Rejected,
+}
+
+impl From<FollowRequestStatus> for i16 {
+    fn from(value: FollowRequestStatus) -> i16 {
+        match value {
+            FollowRequestStatus::Pending  => 1,
+            FollowRequestStatus::Accepted => 2,
+            FollowRequestStatus::Rejected => 3,
+        }
+    }
+}
+
+impl TryFrom<i16> for FollowRequestStatus {
+    type Error = ConversionError;
+
+    fn try_from(value: i16) -> Result<Self, Self::Error> {
+        let status = match value {
+            1 => Self::Pending,
+            2 => Self::Accepted,
+            3 => Self::Rejected,
+            _ => return Err(ConversionError),
+        };
+        Ok(status)
+    }
+}
+
+#[derive(FromSql)]
+#[postgres(name = "follow_request")]
+pub struct DbFollowRequest {
+    pub id: Uuid,
+    pub source_id: Uuid,
+    pub target_id: Uuid,
+    pub request_status: i16,
+}
+
+pub struct FollowRequest {
+    pub id: Uuid,
+    pub source_id: Uuid,
+    pub target_id: Uuid,
+    pub status: FollowRequestStatus,
+}
diff --git a/src/models/users/mod.rs b/src/models/users/mod.rs
new file mode 100644
index 0000000..0333ab5
--- /dev/null
+++ b/src/models/users/mod.rs
@@ -0,0 +1,2 @@
+pub mod queries;
+pub mod types;
diff --git a/src/models/users/queries.rs b/src/models/users/queries.rs
new file mode 100644
index 0000000..2a20169
--- /dev/null
+++ b/src/models/users/queries.rs
@@ -0,0 +1,212 @@
+use tokio_postgres::GenericClient;
+use uuid::Uuid;
+
+use crate::errors::DatabaseError;
+use crate::models::profiles::queries::create_profile;
+use crate::models::profiles::types::{DbActorProfile, ProfileCreateData};
+use crate::utils::crypto::generate_random_string;
+use super::types::{DbUser, User, UserRegistrationData};
+
+pub async fn generate_invite_code(
+    db_client: &impl GenericClient,
+) -> Result<String, DatabaseError> {
+    let invite_code = generate_random_string();
+    db_client.execute(
+        "
+        INSERT INTO user_invite_code (code)
+        VALUES ($1)
+        ",
+        &[&invite_code],
+    ).await?;
+    Ok(invite_code)
+}
+
+pub async fn get_invite_codes(
+    db_client: &impl GenericClient,
+) -> Result<Vec<String>, DatabaseError> {
+    let rows = db_client.query(
+        "
+        SELECT code
+        FROM user_invite_code
+        WHERE used = FALSE
+        ",
+        &[],
+    ).await?;
+    let codes: Vec<String> = rows.iter()
+        .map(|row| row.try_get("code"))
+        .collect::<Result<_, _>>()?;
+    Ok(codes)
+}
+
+pub async fn is_valid_invite_code(
+    db_client: &impl GenericClient,
+    invite_code: &str,
+) -> Result<bool, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT 1 FROM user_invite_code
+        WHERE code = $1 AND used = FALSE
+        ",
+        &[&invite_code],
+    ).await?;
+    Ok(maybe_row.is_some())
+}
+
+pub async fn get_user_by_id(
+    db_client: &impl GenericClient,
+    user_id: &Uuid,
+) -> Result<User, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT user_account, actor_profile
+        FROM user_account JOIN actor_profile USING (id)
+        WHERE id = $1
+        ",
+        &[&user_id],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("user"))?;
+    let db_user: DbUser = row.try_get("user_account")?;
+    let db_profile: DbActorProfile = row.try_get("actor_profile")?;
+    let user = User {
+        id: db_user.id,
+        wallet_address: db_user.wallet_address,
+        password_hash: db_user.password_hash,
+        private_key: db_user.private_key,
+        profile: db_profile,
+    };
+    Ok(user)
+}
+
+pub async fn get_user_by_name(
+    db_client: &impl GenericClient,
+    username: &str,
+) -> Result<User, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT user_account, actor_profile
+        FROM user_account JOIN actor_profile USING (id)
+        WHERE actor_profile.username = $1
+        ",
+        &[&username],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("user"))?;
+    let db_user: DbUser = row.try_get("user_account")?;
+    let db_profile: DbActorProfile = row.try_get("actor_profile")?;
+    let user = User {
+        id: db_user.id,
+        wallet_address: db_user.wallet_address,
+        password_hash: db_user.password_hash,
+        private_key: db_user.private_key,
+        profile: db_profile,
+    };
+    Ok(user)
+}
+
+pub async fn is_registered_user(
+    db_client: &impl GenericClient,
+    username: &str,
+) -> Result<bool, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT 1 FROM user_account JOIN actor_profile USING (id)
+        WHERE actor_profile.username = $1
+        ",
+        &[&username],
+    ).await?;
+    Ok(maybe_row.is_some())
+}
+
+pub async fn create_user(
+    db_client: &mut impl GenericClient,
+    form: UserRegistrationData,
+    password_hash: String,
+    private_key_pem: String,
+) -> Result<User, DatabaseError> {
+    let transaction = db_client.transaction().await?;
+    // Use invite code
+    if let Some(ref invite_code) = form.invite_code {
+        let updated_count = transaction.execute(
+            "
+            UPDATE user_invite_code
+            SET used = TRUE
+            WHERE code = $1 AND used = FALSE
+            ",
+            &[&invite_code],
+        ).await?;
+        if updated_count == 0 {
+            Err(DatabaseError::NotFound("invite code"))?;
+        }
+    }
+    // Create profile
+    let profile_data = ProfileCreateData {
+        username: form.username.clone(),
+        display_name: None,
+        acct: form.username.clone(),
+        bio: None,
+        avatar: None,
+        banner: None,
+        actor: None,
+    };
+    let profile = create_profile(&transaction, &profile_data).await?;
+    // Create user
+    let result = transaction.query_one(
+        "
+        INSERT INTO user_account (
+            id, wallet_address, password_hash, private_key, invite_code
+        )
+        VALUES ($1, $2, $3, $4, $5)
+        RETURNING user_account
+        ",
+        &[
+            &profile.id,
+            &form.wallet_address,
+            &password_hash,
+            &private_key_pem,
+            &form.invite_code,
+        ],
+    ).await;
+    match result {
+        Ok(row) => {
+            transaction.commit().await?;
+            let db_user: DbUser = row.try_get("user_account")?;
+            let user = User {
+                id: db_user.id,
+                wallet_address: db_user.wallet_address,
+                password_hash: db_user.password_hash,
+                private_key: db_user.private_key,
+                profile,
+            };
+            Ok(user)
+        },
+        Err(err) => {
+            // TODO: catch user already exists error
+            log::info!("{}", err);
+            Err(DatabaseError::AlreadyExists("user"))?
+        },
+    }
+}
+
+pub async fn get_user_by_wallet_address(
+    db_client: &impl GenericClient,
+    wallet_address: &str,
+) -> Result<User, DatabaseError> {
+    let maybe_row = db_client.query_opt(
+        "
+        SELECT user_account, actor_profile
+        FROM user_account JOIN actor_profile USING (id)
+        WHERE wallet_address = $1
+        ",
+        &[&wallet_address],
+    ).await?;
+    let row = maybe_row.ok_or(DatabaseError::NotFound("user"))?;
+    let db_user: DbUser = row.try_get("user_account")?;
+    let db_profile: DbActorProfile = row.try_get("actor_profile")?;
+    let user = User {
+        id: db_user.id,
+        wallet_address: db_user.wallet_address,
+        password_hash: db_user.password_hash,
+        private_key: db_user.private_key,
+        profile: db_profile,
+    };
+    Ok(user)
+}
diff --git a/src/models/users/types.rs b/src/models/users/types.rs
new file mode 100644
index 0000000..ae65e24
--- /dev/null
+++ b/src/models/users/types.rs
@@ -0,0 +1,72 @@
+use chrono::{DateTime, Utc};
+use postgres_types::FromSql;
+use regex::Regex;
+use serde::Deserialize;
+use uuid::Uuid;
+
+use crate::errors::ValidationError;
+use crate::models::profiles::types::DbActorProfile;
+
+#[derive(FromSql)]
+#[postgres(name = "user_account")]
+pub struct DbUser {
+    pub id: Uuid,
+    pub wallet_address: String,
+    pub password_hash: String,
+    pub private_key: String,
+    pub invite_code: Option<String>,
+    pub created_at: DateTime<Utc>,
+}
+
+// Represents local user
+#[derive(Clone)]
+pub struct User {
+    pub id: Uuid,
+    pub wallet_address: String,
+    pub password_hash: String,
+    pub private_key: String,
+    pub profile: DbActorProfile,
+}
+
+#[derive(Deserialize)]
+pub struct UserRegistrationData {
+    pub username: String,
+    pub signature: String,
+    pub wallet_address: String,
+    pub invite_code: Option<String>,
+}
+
+fn validate_username(username: &str) -> Result<(), ValidationError> {
+    let username_regexp = Regex::new(r"^[a-z0-9_]+$").unwrap();
+    if !username_regexp.is_match(username) {
+        return Err(ValidationError("invalid username"));
+    }
+    Ok(())
+}
+
+impl UserRegistrationData {
+    /// Validate and clean.
+    pub fn clean(&self) -> Result<(), ValidationError> {
+        validate_username(&self.username)?;
+        Ok(())
+    }
+}
+
+#[derive(Deserialize)]
+pub struct UserLoginData {
+    pub signature: String,
+    pub wallet_address: String,
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_validate_username() {
+        let result_1 = validate_username("name_1");
+        assert_eq!(result_1.is_ok(), true);
+        let result_2 = validate_username("name&");
+        assert_eq!(result_2.is_ok(), false);
+    }
+}
diff --git a/src/nodeinfo/mod.rs b/src/nodeinfo/mod.rs
new file mode 100644
index 0000000..718ba5f
--- /dev/null
+++ b/src/nodeinfo/mod.rs
@@ -0,0 +1,2 @@
+mod types;
+pub mod views;
diff --git a/src/nodeinfo/types.rs b/src/nodeinfo/types.rs
new file mode 100644
index 0000000..a687908
--- /dev/null
+++ b/src/nodeinfo/types.rs
@@ -0,0 +1,68 @@
+/// http://nodeinfo.diaspora.software/schema.html
+
+use serde::Serialize;
+
+use crate::config::Config;
+
+#[derive(Serialize)]
+struct Software {
+    name: String,
+    version: String,
+}
+
+#[derive(Serialize)]
+struct Services {
+    inbound: Vec<String>,
+    outbound: Vec<String>,
+}
+
+#[derive(Serialize)]
+struct Users {
+}
+
+#[derive(Serialize)]
+struct Usage {
+    users: Users,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+struct Metadata {
+    node_name: String,
+    node_description: String,
+}
+
+#[derive(Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct NodeInfo20 {
+    version: String,
+    software: Software,
+    protocols: Vec<String>,
+    services: Services,
+    open_registrations: bool,
+    usage: Usage,
+    metadata: Metadata,
+}
+
+impl NodeInfo20 {
+    pub fn new(config: &Config) -> Self {
+        let software = Software {
+            name: "mitra".to_string(),
+            version: config.version.clone(),
+        };
+        let services = Services { inbound: vec![], outbound: vec![] };
+        let metadata = Metadata {
+            node_name: config.instance_title.clone(),
+            node_description: config.instance_short_description.clone(),
+        };
+        Self {
+            version: "2.0".to_string(),
+            software,
+            protocols: vec!["activitypub".to_string()],
+            services,
+            open_registrations: config.registrations_open,
+            usage: Usage { users: Users { } },
+            metadata,
+        }
+    }
+}
diff --git a/src/nodeinfo/views.rs b/src/nodeinfo/views.rs
new file mode 100644
index 0000000..82e795a
--- /dev/null
+++ b/src/nodeinfo/views.rs
@@ -0,0 +1,39 @@
+/// http://nodeinfo.diaspora.software/protocol.html
+
+use actix_web::{get, web, HttpResponse};
+
+use crate::config::Config;
+use crate::errors::HttpError;
+use crate::webfinger::types::{
+    Link,
+    JsonResourceDescriptor,
+};
+use super::types::NodeInfo20;
+
+#[get("/.well-known/nodeinfo")]
+pub async fn get_nodeinfo(
+    config: web::Data<Config>,
+) -> Result<HttpResponse, HttpError> {
+    let nodeinfo_2_0_url = format!("{}/nodeinfo/2.0", config.instance_url());
+    let link = Link {
+        rel: "http://nodeinfo.diaspora.software/ns/schema/2.0".to_string(),
+        link_type: None,
+        href: Some(nodeinfo_2_0_url),
+    };
+    let jrd = JsonResourceDescriptor {
+        subject: config.instance_url(),
+        links: vec![link],
+    };
+    let response = HttpResponse::Ok().json(jrd);
+    Ok(response)
+}
+
+#[get("/nodeinfo/2.0")]
+pub async fn get_nodeinfo_2_0(
+    config: web::Data<Config>,
+) -> Result<HttpResponse, HttpError> {
+    let nodeinfo = NodeInfo20::new(&config);
+    let response = HttpResponse::Ok().json(nodeinfo);
+    Ok(response)
+}
+
diff --git a/src/scheduler.rs b/src/scheduler.rs
new file mode 100644
index 0000000..f45b9dd
--- /dev/null
+++ b/src/scheduler.rs
@@ -0,0 +1,24 @@
+use std::time::Duration;
+
+use crate::config::Config;
+use crate::database::Pool;
+use crate::ethereum::nft::{get_nft_contract, process_events};
+
+pub fn run(config: Config, db_pool: Pool) -> () {
+    actix_rt::spawn(async move {
+        let mut interval = actix_rt::time::interval(Duration::from_secs(30));
+        // Verify config and create contract interface
+        let web3_contract = get_nft_contract(&config).await
+            .map_err(|err| log::error!("{}", err))
+            .ok();
+        loop {
+            interval.tick().await;
+            // Process events only if contract is properly configured
+            if let Some((web3, contract)) = web3_contract.as_ref() {
+                process_events(web3, contract, &db_pool).await.unwrap_or_else(|err| {
+                    log::error!("{}", err);
+                });
+            }
+        }
+    });
+}
diff --git a/src/utils/crypto.rs b/src/utils/crypto.rs
new file mode 100644
index 0000000..1c9c7ba
--- /dev/null
+++ b/src/utils/crypto.rs
@@ -0,0 +1,115 @@
+use rand;
+use rand::prelude::*;
+use rsa::{Hash, PaddingScheme, PublicKey, RsaPrivateKey, RsaPublicKey};
+use rsa::pkcs8::{FromPrivateKey, FromPublicKey, ToPrivateKey, ToPublicKey};
+use sha2::{Digest, Sha256};
+
+pub fn generate_random_string() -> String {
+    let mut rng = rand::thread_rng();
+    let value: [u8; 16] = rng.gen();
+    hex::encode(value)
+}
+
+pub fn hash_password(password: &str) -> Result<String, argon2::Error> {
+    let mut rng = rand::thread_rng();
+    let salt: [u8; 32] = rng.gen();
+    let config = argon2::Config::default();
+
+    argon2::hash_encoded(password.as_bytes(), &salt, &config)
+}
+
+pub fn verify_password(
+    password_hash: &str,
+    password: &str,
+) -> Result<bool, argon2::Error> {
+    argon2::verify_encoded(password_hash, password.as_bytes())
+}
+
+pub fn generate_private_key() -> Result<RsaPrivateKey, rsa::errors::Error> {
+    let mut rng = rand::rngs::OsRng;
+    let bits = 2048;
+    RsaPrivateKey::new(&mut rng, bits)
+}
+
+pub fn serialize_private_key(
+    private_key: RsaPrivateKey,
+) -> Result<String, rsa::pkcs8::Error> {
+    private_key.to_pkcs8_pem().map(|val| val.to_string())
+}
+
+pub fn deserialize_private_key(
+    private_key_pem: &str,
+) -> Result<RsaPrivateKey, rsa::pkcs8::Error> {
+    RsaPrivateKey::from_pkcs8_pem(&private_key_pem)
+}
+
+pub fn get_public_key_pem(
+    private_key: &RsaPrivateKey,
+) -> Result<String, rsa::pkcs8::Error> {
+    let public_key = RsaPublicKey::from(private_key);
+    public_key.to_public_key_pem()
+}
+
+pub fn deserialize_public_key(
+    public_key_pem: &str,
+) -> Result<RsaPublicKey, rsa::pkcs8::Error> {
+    RsaPublicKey::from_public_key_pem(&public_key_pem.trim())
+}
+
+pub fn sign_message(
+    private_key: &RsaPrivateKey,
+    message: &str,
+) -> Result<String, rsa::errors::Error> {
+    let digest = Sha256::digest(message.as_bytes());
+    let padding = PaddingScheme::new_pkcs1v15_sign(Some(Hash::SHA2_256));
+    let signature = private_key.sign(padding, &digest)?;
+    let signature_b64 = base64::encode(&signature);
+    Ok(signature_b64)
+}
+
+pub fn get_message_digest(message: &str) -> String {
+    let digest = Sha256::digest(message.as_bytes());
+    let digest_b64 = base64::encode(digest);
+    format!("SHA-256={}", digest_b64)
+}
+
+pub fn verify_signature(
+    public_key: &RsaPublicKey,
+    message: &str,
+    signature_b64: &str,
+) -> Result<bool, base64::DecodeError> {
+    let digest = Sha256::digest(message.as_bytes());
+    let padding = PaddingScheme::new_pkcs1v15_sign(Some(Hash::SHA2_256));
+    let signature = base64::decode(signature_b64)?;
+    let is_valid = public_key.verify(
+        padding,
+        &digest,
+        &signature,
+    ).is_ok();
+    Ok(is_valid)
+}
+
+#[cfg(test)]
+mod tests {
+    use rand::rngs::OsRng;
+    use super::*;
+
+    #[test]
+    fn test_public_key_serialization_deserialization() {
+        let private_key = RsaPrivateKey::new(&mut OsRng, 512).unwrap();
+        let public_key_pem = get_public_key_pem(&private_key).unwrap();
+        let public_key = deserialize_public_key(&public_key_pem).unwrap();
+        assert_eq!(public_key, RsaPublicKey::from(&private_key));
+    }
+
+    #[test]
+    fn test_verify_signature() {
+        let private_key = RsaPrivateKey::new(&mut OsRng, 512).unwrap();
+        let message = "test".to_string();
+        let signature = sign_message(&private_key, &message).unwrap();
+        let public_key = RsaPublicKey::from(&private_key);
+
+        let is_valid = verify_signature(&public_key, &message, &signature).unwrap();
+        assert_eq!(is_valid, true);
+    }
+}
diff --git a/src/utils/files.rs b/src/utils/files.rs
new file mode 100644
index 0000000..7701cac
--- /dev/null
+++ b/src/utils/files.rs
@@ -0,0 +1,68 @@
+use std::fs::File;
+use std::io::prelude::*;
+use std::path::PathBuf;
+
+use mime_guess::get_mime_extensions_str;
+use mime_sniffer::MimeTypeSniffer;
+use sha2::{Digest, Sha256};
+
+#[derive(thiserror::Error, Debug)]
+pub enum FileError {
+    #[error(transparent)]
+    WriteError(#[from] std::io::Error),
+
+    #[error("base64 decoding error")]
+    Base64DecodingError(#[from] base64::DecodeError),
+
+    #[error("invalid media type")]
+    InvalidMediaType,
+}
+
+pub fn save_file(data: Vec<u8>, output_dir: &PathBuf) -> Result<String, FileError> {
+    let digest = Sha256::digest(&data);
+    let mut file_name = hex::encode(digest);
+    let maybe_extension = data.sniff_mime_type()
+        .and_then(|media_type| get_mime_extensions_str(media_type))
+        .and_then(|extensions| extensions.first());
+    if let Some(extension) = maybe_extension {
+        // Append extension for known media types
+        file_name = format!("{}.{}", file_name, extension);
+    }
+    let file_path = output_dir.join(&file_name);
+    let mut file = File::create(&file_path)?;
+    file.write_all(&data)?;
+    Ok(file_name)
+}
+
+fn sniff_media_type(data: &Vec<u8>) -> Option<String> {
+    data.sniff_mime_type().map(|val| val.to_string())
+}
+
+pub fn save_b64_file(
+    b64data: &str,
+    output_dir: &PathBuf,
+) -> Result<(String, Option<String>), FileError> {
+    let data = base64::decode(b64data)?;
+    let media_type = sniff_media_type(&data);
+    let file_name = save_file(data, output_dir)?;
+    Ok((file_name, media_type))
+}
+
+pub fn save_validated_b64_file(
+    b64data: &str,
+    output_dir: &PathBuf,
+    media_type_prefix: &str,
+) -> Result<(String, String), FileError> {
+    let data = base64::decode(b64data)?;
+    let media_type = sniff_media_type(&data)
+        .ok_or(FileError::InvalidMediaType)?;
+    if !media_type.starts_with(media_type_prefix) {
+        return Err(FileError::InvalidMediaType);
+    }
+    let file_name = save_file(data, output_dir)?;
+    Ok((file_name, media_type))
+}
+
+pub fn get_file_url(instance_url: &str, file_name: &str) -> String {
+    format!("{}/media/{}", instance_url, file_name)
+}
diff --git a/src/utils/html.rs b/src/utils/html.rs
new file mode 100644
index 0000000..1652cc8
--- /dev/null
+++ b/src/utils/html.rs
@@ -0,0 +1,27 @@
+use std::collections::HashSet;
+
+use ammonia::Builder;
+
+pub fn clean_html(unsafe_html: &str) -> String {
+    let mut allowed_tags = HashSet::new();
+    allowed_tags.insert("a");
+    allowed_tags.insert("br");
+
+    let safe_html = Builder::default()
+        .tags(allowed_tags)
+        .clean(unsafe_html)
+        .to_string();
+    safe_html
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_clean_html() {
+        let unsafe_html = r#"<p>test <b>bold</b><script>dangerous</script> with <a href="https://example.com">link</a></p>"#;
+        let safe_html = clean_html(unsafe_html);
+        assert_eq!(safe_html, r#"test bold with <a href="https://example.com" rel="noopener noreferrer">link</a>"#);
+    }
+}
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
new file mode 100644
index 0000000..960d114
--- /dev/null
+++ b/src/utils/mod.rs
@@ -0,0 +1,3 @@
+pub mod crypto;
+pub mod files;
+pub mod html;
diff --git a/src/webfinger/mod.rs b/src/webfinger/mod.rs
new file mode 100644
index 0000000..a964b01
--- /dev/null
+++ b/src/webfinger/mod.rs
@@ -0,0 +1,2 @@
+pub mod types;
+pub mod views;
diff --git a/src/webfinger/types.rs b/src/webfinger/types.rs
new file mode 100644
index 0000000..af00a67
--- /dev/null
+++ b/src/webfinger/types.rs
@@ -0,0 +1,27 @@
+/// https://webfinger.net/
+
+use serde::{Serialize, Deserialize};
+
+pub const JRD_CONTENT_TYPE: &str = "application/jrd+json";
+
+#[derive(Deserialize)]
+pub struct WebfingerQueryParams {
+    pub resource: String,
+}
+
+#[derive(Serialize, Deserialize)]
+pub struct Link {
+    pub rel: String,
+
+    #[serde(rename = "type", skip_serializing_if = "Option::is_none")]
+    pub link_type: Option<String>,
+
+    pub href: Option<String>,
+}
+
+// https://datatracker.ietf.org/doc/html/rfc7033#section-4.4
+#[derive(Serialize, Deserialize)]
+pub struct JsonResourceDescriptor {
+    pub subject: String,
+    pub links: Vec<Link>,
+}
diff --git a/src/webfinger/views.rs b/src/webfinger/views.rs
new file mode 100644
index 0000000..af8e7e7
--- /dev/null
+++ b/src/webfinger/views.rs
@@ -0,0 +1,66 @@
+use actix_web::{get, web, HttpResponse};
+use regex::Regex;
+
+use crate::activitypub::views::get_actor_url;
+use crate::activitypub::constants::ACTIVITY_CONTENT_TYPE;
+use crate::config::Config;
+use crate::database::{Pool, get_database_client};
+use crate::errors::HttpError;
+use crate::models::users::queries::is_registered_user;
+use super::types::{
+    JRD_CONTENT_TYPE,
+    WebfingerQueryParams,
+    Link,
+    JsonResourceDescriptor,
+};
+
+pub async fn get_user_info(
+    db_pool: &Pool,
+    config: &Config,
+    query_params: WebfingerQueryParams,
+) -> Result<JsonResourceDescriptor, HttpError> {
+    // Parse 'acct' URI
+    // https://datatracker.ietf.org/doc/html/rfc7565#section-7
+    let uri_regexp = Regex::new(r"acct:(?P<user>\w+)@(?P<instance>.+)").unwrap();
+    let uri_caps = uri_regexp.captures(&query_params.resource)
+        .ok_or(HttpError::ValidationError("invalid query target".into()))?;
+    let username = uri_caps.name("user")
+        .ok_or(HttpError::ValidationError("invalid query target".into()))?
+        .as_str();
+    let instance_uri = uri_caps.name("instance")
+        .ok_or(HttpError::ValidationError("invalid query target".into()))?
+        .as_str();
+
+    if instance_uri != config.instance_uri {
+        // Wrong instance URI
+        return Err(HttpError::NotFoundError("user"));
+    }
+    let db_client = &**get_database_client(db_pool).await?;
+    if !is_registered_user(db_client, &username).await? {
+        return Err(HttpError::NotFoundError("user"));
+    }
+    let actor_url = get_actor_url(&config.instance_url(), &username);
+    let link = Link {
+        rel: "self".to_string(),
+        link_type: Some(ACTIVITY_CONTENT_TYPE.to_string()),
+        href: Some(actor_url),
+    };
+    let jrd = JsonResourceDescriptor {
+        subject: query_params.resource,
+        links: vec![link],
+    };
+    Ok(jrd)
+}
+
+#[get("/.well-known/webfinger")]
+async fn get_descriptor(
+    config: web::Data<Config>,
+    db_bool: web::Data<Pool>,
+    query_params: web::Query<WebfingerQueryParams>,
+) -> Result<HttpResponse, HttpError> {
+    let jrd = get_user_info(&db_bool, &config, query_params.into_inner()).await?;
+    let response = HttpResponse::Ok()
+        .content_type(JRD_CONTENT_TYPE)
+        .json(jrd);
+    Ok(response)
+}