feat: added special address with block number and block hash

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Next release
 
+- fix(snos): added special address while closing block for SNOS
 - fix(devnet): devnet predeployed contracts stable address across systems (re)
 - chore: Fixed README table format
 - fix(cli): fixed devnet cli arguments

crates/client/mempool/src/block_production.rs

@@ -405,9 +405,32 @@ impl<Mempool: MempoolProvider> BlockProductionTask<Mempool> {
 
         // Complete the block with full bouncer capacity.
         let start_time = Instant::now();
-        let (new_state_diff, _n_executed) =
+        let (mut new_state_diff, _n_executed) =
             self.continue_block(self.backend.chain_config().bouncer_config.block_max_capacity)?;
 
+        if block_n >= 10 {
+            let prev_block_number = block_n - 10;
+            match self.backend.get_block_hash(&BlockId::Number(prev_block_number)) {
+                Ok(Some(prev_block_hash)) => {
+                    let address = Felt::ONE;
+                    new_state_diff.storage_diffs.push(ContractStorageDiffItem {
+                        address,
+                        storage_entries: vec![StorageEntry {
+                            key: Felt::from(prev_block_number),
+                            value: prev_block_hash,
+                        }],
+                    });
+                }
+                Ok(None) => {
+                    // this shouldn't happen, ideally should panic
+                    log::error!("No block hash found for block number {}", prev_block_number);
+                }
+                Err(e) => {
+                    log::error!("Error fetching block hash for block {}: {:?}", prev_block_number, e);
+                }
+            }
+        }
+
         // Convert the pending block to a closed block and save to db.
 
         let parent_block_hash = Felt::ZERO; // temp parent block hash

crates/primitives/chain_config/src/chain_config.rs

@@ -263,6 +263,8 @@ impl ChainConfig {
             chain_name: "Madara".into(),
             chain_id: ChainId::Other("MADARA_DEVNET".into()),
             sequencer_address: Felt::from_hex_unchecked("0x123").try_into().unwrap(),
+            block_time: Duration::from_secs(4),
+            pending_block_update_time: Duration::from_secs(1),
             ..ChainConfig::starknet_sepolia()
         }
     }