Use pointer types for BlockHash/TransactionHash in ActionTrace to handle JSON null

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Cifer

rpc/namespaces/ethereum/pre/api.go

@@ -130,9 +130,10 @@ func (a *API) TraceMany(args []CallArgs) ([]evmtypes.PreResult, error) {
 		for j := range preResList[i].Logs {
 			preResList[i].Logs[j].BlockHash = blockHash
 		}
+		zeroHash := common.Hash{}
 		for j := range preResList[i].Trace {
-			preResList[i].Trace[j].BlockHash = blockHash
-			preResList[i].Trace[j].TransactionHash = common.Hash{}
+			preResList[i].Trace[j].BlockHash = &blockHash
+			preResList[i].Trace[j].TransactionHash = &zeroHash
 		}
 	}
 	return preResList, nil

x/vm/types/action_trace.go

@@ -25,9 +25,9 @@ type ActionTrace struct {
 	Action              TAction     `json:"action"`
 	Result              *TResult    `json:"result,omitempty"`
 	Error               string      `json:"error,omitempty"`
-	BlockHash           common.Hash `json:"blockHash,omitempty"`
-	BlockNumber         int64       `json:"blockNumber"`
-	TransactionHash     common.Hash `json:"transactionHash,omitempty"`
+	BlockHash           *common.Hash `json:"blockHash,omitempty"`
+	BlockNumber         int64        `json:"blockNumber"`
+	TransactionHash     *common.Hash `json:"transactionHash,omitempty"`
 	TransactionPosition uint64      `json:"transactionPosition"`
 }