Code For Auth ECDSA

ecdsa.js

// Try API v2 Signature
  if (version === 2) {
  var hexkey = new Buffer(key, 'base64').toString('hex');
  var hexsig = new Buffer(signature, 'base64').toString('hex');
  var checkSign = new jscrypto.Signature({
  'alg': 'SHA256withECDSA',
  'prov': 'cryptojs/jsrsa'
  });
  checkSign.initVerifyByPublicKey({
  'ecpubhex': hexkey,
  'eccurvename': 'secp256k1'
  });
  checkSign.updateString(message);
  return checkSign.verify(hexsig);
  }