diff --git a/signmsg.js b/signmsg.js
new file mode 100644
index 0000000..60672a8
--- /dev/null
+++ b/signmsg.js
@@ -0,0 +1,19 @@
+const fs = require("fs");
+const mnemonic = fs.readFileSync(".secret").toString().trim();
+
+// web3.eth.defaultAccount = '0x50A8e60041A206AcaA5F844a1104896224be6F39'
+const arbOneKey = fs.readFileSync(".key").toString().trim();
+const arbOneAddr = fs.readFileSync(".addr").toString().trim();
+
+const Web3 = require('web3');
+
+const w3 = new Web3('https://arbitrum-one.public.blastapi.io')
+
+const msg = 'some msg that need sign'
+let res = w3.eth.accounts.sign(msg, arbOneKey)
+
+console.log(res)
+
+let hash = w3.eth.accounts.hashMessage(res.signature)
+
+console.log(hash)