diff --git a/config.yaml.example b/config.yaml.example
index 0c0a276..7a30818 100644
--- a/config.yaml.example
+++ b/config.yaml.example
@@ -11,12 +11,13 @@ instance_description: My instance
 registrations_open: true
 
 blockchain:
+  # Parameters for hardhat local node
   chain_id: eip155:31337
   contract_address: '0xDc64a140Aa3E981100a9becA4E685f962f0cF6C9'
   contract_dir: contracts
-  api_url: 'http://127.0.0.1:8545'
+  api_url: 'http://127.0.0.1:8546'
   explorer_url: null
-  signing_key: null
+  signing_key: 'ac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80'
 
 ipfs_api_url: 'http://127.0.0.1:5001'
 ipfs_gateway_url: 'http://127.0.0.1:8001'