diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index deac90ee..3e0a0146 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -2671,5 +2671,7 @@ utils.isAlpha = function isAlpha(key) {
   if (typeof key !== 'string')
     return false;
   // We allow /-~ (exclusive), 0-} (inclusive)
-  return key.length !== 0 && /^[\u0030-\u007d]+$/.test(key);
+  return key.length > 0
+    && key.length <= 64
+    && /^[\u0030-\u007d]+$/.test(key);
 };
diff --git a/lib/bcoin/walletdb.js b/lib/bcoin/walletdb.js
index 7ae35ff8..feb4bdbb 100644
--- a/lib/bcoin/walletdb.js
+++ b/lib/bcoin/walletdb.js
@@ -579,9 +579,6 @@ WalletDB.prototype.auth = function auth(id, token, callback) {
   var self = this;
   var wallet;
 
-  if (!id)
-    return callback(new Error('Wallet not found.'));
-
   this._get(id, function(err, wallet) {
     if (err)
       return callback(err);