diff --git a/grpc/pb/bdware/bdledger/api/common.proto b/grpc/pb/bdware/bdledger/api/common.proto
index 1b5e447..b533205 100644
--- a/grpc/pb/bdware/bdledger/api/common.proto
+++ b/grpc/pb/bdware/bdledger/api/common.proto
@@ -43,7 +43,7 @@ message Block {
   repeated Transaction transactions = 10; // 事务对象的数组，或为空
   repeated bytes transaction_hashes = 11; // 20字节的事务哈希的数组，或为空
   bytes creator_signature = 12;           // 产块者签名
-  bytes witness_signatures = 13;          // 见证者签名
+  repeated bytes witness_signatures = 13; // 见证者签名
 }
 
 message Contract {