diff --git a/lib/crypto.js b/lib/crypto.js
index 08fa9ef..8e8c78e 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -27,7 +27,7 @@ var sha1 = exports.sha1 = platform.sha1;
  * @return {Buffer} Resulting hash.
  * @function
  */
-exports.sha256 = platform.sha256;
+var sha256 = exports.sha256 = platform.sha256;
 
 /**
  * Calculate SHA-512 hash.
@@ -91,7 +91,11 @@ exports.sign = function(privateKey, msg) {
  */
 exports.verify = function(publicKey, msg, sig) {
   var hash = sha1(msg);
-  return eccrypto.verify(publicKey, hash, sig);
+  var result = eccrypto.verify(publicKey, hash, sig).catch(function() {
+    hash = sha256(msg);
+    return eccrypto.verify(publicKey, hash, sig);
+  });
+  return result;
 };
 
 var SECP256K1_TYPE = 714;