Drop support for "blockchain" setting

CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+### Removed
+
+- Dropped support for `blockchain` configuration parameter.
+
 ## [1.11.0] - 2023-01-23
 
 ### Added

src/config/main.rs

@@ -106,7 +106,7 @@ pub struct Config {
 
     // Blockchain integrations
     #[serde(rename = "blockchain")]
-    pub _blockchain: Option<BlockchainConfig>, // deprecated
+    _blockchain: Option<BlockchainConfig>, // deprecated
     #[serde(default)]
     blockchains: Vec<BlockchainConfig>,
 
@@ -146,8 +146,8 @@ impl Config {
     }
 
     pub fn blockchain(&self) -> Option<&BlockchainConfig> {
-        if let Some(ref blockchain_config) = self._blockchain {
+        if let Some(ref _blockchain_config) = self._blockchain {
-            Some(blockchain_config)
+            panic!("'blockchain' setting is not supported anymore, use 'blockchains' instead");
         } else {
             match &self.blockchains[..] {
                 [blockchain_config] => Some(blockchain_config),

src/main.rs

@@ -57,9 +57,6 @@ async fn main() -> std::io::Result<()> {
         config.environment,
     );
 
-    if config._blockchain.is_some() {
-        log::warn!("'blockchain' property is deprecated, use 'blockchains' instead");
-    };
     let maybe_blockchain = if let Some(blockchain_config) = config.blockchain() {
         if let Some(ethereum_config) = blockchain_config.ethereum_config() {
             // Create blockchain interface