diff --git a/ccapi/handlers/qscc.go b/ccapi/handlers/qscc.go
index 22a486d..d999d39 100644
--- a/ccapi/handlers/qscc.go
+++ b/ccapi/handlers/qscc.go
@@ -4,7 +4,7 @@ import (
 	"encoding/hex"
 	"fmt"
 	"net/http"
-
+	
 	"github.com/gin-gonic/gin"
 	"github.com/hyperledger-labs/ccapi/chaincode"
 	"github.com/hyperledger-labs/ccapi/common"
@@ -24,8 +24,8 @@ func QueryQSCC(c *gin.Context) {
 	switch txname {
 	case "getBlockByNumber":
 		getBlockByNumber(c, channelName)
-	// case "getBlockByHash":
-	// 	getBlockByHash(c, channelName)
+	case "getBlockByHash":
+	getBlockByHash(c, channelName)
 	case "getTransactionByID":
 		getTransactionByID(c, channelName)
 	case "getChainInfo":
@@ -139,7 +139,15 @@ func getBlockByHash(c *gin.Context, channelName string) {
 		return
 	}
 
-	result, err := chaincode.QueryGateway(channelName, "qscc", "GetBlockByHash", user, []string{channelName, hash})
+	hashBytes, err := hex.DecodeString(hash)
+
+	if err != nil {
+		common.Abort(c, http.StatusBadRequest, fmt.Errorf("invalid hash format: %s", hash))
+		return
+	}
+
+	result, err := chaincode.QueryGateway(channelName, "qscc", "GetBlockByHash", user, []string{channelName, string(hashBytes)})
+	
 	if err != nil {
 		err, status := common.ParseError(err)
 		common.Abort(c, status, err)
@@ -440,4 +448,4 @@ func decodeProcessedTransaction(t []byte) (map[string]interface{}, error) {
 	}
 
 	return processedTransactionMap, nil
-}
+}
\ No newline at end of file