diff --git a/server/web3bcspider/services/blockchain.js b/server/web3bcspider/services/blockchain.js
index f6e84a0..ae8cd0d 100644
--- a/server/web3bcspider/services/blockchain.js
+++ b/server/web3bcspider/services/blockchain.js
@@ -6,9 +6,8 @@ const event = require('j7/event');
 const sync = require("j7/sync");
 const log = require("j7/log");
 const metaFactory = require('./metadata/factory');
-const C = require("./C");
 
-class BlockChain {
+class BlockChain extends BaseService {
 
   constructor() {
     this.actived = false;