fix(rpc): emit canonical block hash in newHeads subscription

Signed-off-by: puneetmahajan <59960662+puneet2019@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: puneet2019

CHANGELOG.md

@@ -34,6 +34,7 @@
 
 ### BUG FIXES
 
+- [\#PENDING_PR](https://github.com/cosmos/evm/pull/PENDING_PR) Emit the canonical CometBFT block hash in the `newHeads` subscription so it matches `eth_getBlockByNumber` (completes [\#725](https://github.com/cosmos/evm/pull/725)).
 - [\#1047](https://github.com/cosmos/evm/pull/1047) Resolve EthTxIndex -1 sentinel before uint cast in ReceiptsFromCometBlock, preventing transactionIndex overflow to MaxUint64.
 - [\#965](https://github.com/cosmos/evm/pull/965) Fix gas double charging on EVM calls in IBCOnTimeoutPacketCallback.
 - [\#869](https://github.com/cosmos/evm/pull/869) Fix erc20 IBC callbacks to check for native token transfer before parsing recipient.

rpc/websockets.go

@@ -25,6 +25,7 @@ import (
 
 	rpcfilters "github.com/cosmos/evm/rpc/namespaces/ethereum/eth/filters"
 	"github.com/cosmos/evm/rpc/stream"
+	rpctypes "github.com/cosmos/evm/rpc/types"
 	"github.com/cosmos/evm/server/config"
 
 	"cosmossdk.io/log/v2"
@@ -463,7 +464,7 @@ func (api *pubSubAPI) subscribeNewHeads(wsConn *wsConn, subID rpc.ID) (context.C
 				Method:  "eth_subscription",
 				Params: &SubscriptionResult{
 					Subscription: subID,
-					Result:       header.EthHeader,
+					Result:       rpctypes.RPCMarshalHeader(header.EthHeader, header.Hash.Bytes()),
 				},
 			}