diff --git a/server/web3service/services/blockchain.js b/server/web3service/services/blockchain.js
index 70f60ec..1efb715 100644
--- a/server/web3service/services/blockchain.js
+++ b/server/web3service/services/blockchain.js
@@ -29,8 +29,15 @@ class BlockChain extends BaseService {
     return this.#bc.getNftAddress(tokenType);
   }
 
-  async soliditySha3Sign() {
+  getUserAddress() {
+    return this.#bc.getUserAddress();
+  }
 
+  async soliditySha3Sign(...args) {
+    let signStr = await this.#bc.web3.utils.soliditySha3(...args);
+    let signature = await this.#bc.web3.eth.sign(signStr, this.getUserAddress());
+    signature = signature.replace(/00$/, "1b").replace(/01$/, "1c");
+    return signature;
   }
 
 }