diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index 073e7e35..40d5da52 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -781,7 +781,7 @@ Chain.prototype._findDuplicates = function _findDuplicates(block, prev, callback
     var hash = tx.hash('hex');
 
     // BIP30 - Ensure there are no duplicate txids
-    self.db.isUnspentTX(hash, function(err, result) {
+    self.db.hasCoins(hash, function(err, result) {
       if (err)
         return next(err);
 
diff --git a/lib/bcoin/chaindb.js b/lib/bcoin/chaindb.js
index 4eab67fe..98eaf221 100644
--- a/lib/bcoin/chaindb.js
+++ b/lib/bcoin/chaindb.js
@@ -1479,40 +1479,14 @@ ChainDB.prototype.getBlock = function getBlock(hash, callback) {
 };
 
 /**
- * Check whether a transaction is unspent (i.e. not yet _fully_ spent).
+ * Check whether coins are still unspent. Necessary for bip30.
  * @see https://bitcointalk.org/index.php?topic=67738.0
  * @param {Hash} hash
  * @param {Function} callback - Returns [Error, Boolean].
  */
 
-ChainDB.prototype.isUnspentTX = function isUnspentTX(hash, callback) {
-  if (this.options.spv)
-    return callback(null, false);
-
-  return this.isSpentTX(hash, function(err, spent) {
-    if (err)
-      return callback(err);
-
-    return callback(null, !spent);
-  });
-};
-
-/**
- * Check whether a transaction is _fully_ spent.
- * @see https://bitcointalk.org/index.php?topic=67738.0
- * @param {Hash} hash
- * @param {Function} callback - Returns [Error, Boolean].
- */
-
-ChainDB.prototype.isSpentTX = function isSpentTX(hash, callback) {
-  if (hash.hash)
-    hash = hash.hash('hex');
-
-  this.getCoins(hash, function(err, coins) {
-    if (err)
-      return callback(err);
-    return callback(null, !coins);
-  });
+ChainDB.prototype.hasCoins = function hasCoins(hash, callback) {
+  this.db.has(layout.c(hash), callback);
 };
 
 ChainDB.prototype._pruneBlock = function _pruneBlock(block, batch, callback) {