diff --git a/lib/bcoin/protocol/constants.js b/lib/bcoin/protocol/constants.js
index f4b7e031..825cec0e 100644
--- a/lib/bcoin/protocol/constants.js
+++ b/lib/bcoin/protocol/constants.js
@@ -150,3 +150,8 @@ exports.block = {
 };
 
 exports.locktimeThreshold = 500000000; // Tue Nov  5 00:53:20 1985 UTC
+
+exports.oneHash = utils.toArray(
+  '0000000000000000000000000000000000000000000000000000000000000001',
+  'hex'
+);
diff --git a/lib/bcoin/tx.js b/lib/bcoin/tx.js
index ef40b2fa..bfae68a7 100644
--- a/lib/bcoin/tx.js
+++ b/lib/bcoin/tx.js
@@ -414,6 +414,11 @@ TX.prototype.subscriptHash = function subscriptHash(index, s, type) {
   if (typeof type === 'string')
     type = constants.hashType[type];
 
+  // bitcoind used to return 1 as an error code:
+  // it ended up being treated like a hash.
+  if (index >= copy.inputs.length)
+    return constants.oneHash;
+
   copy.inputs.forEach(function(input, i) {
     input.script = index === i ? s : [];
   });
@@ -427,6 +432,9 @@ TX.prototype.subscriptHash = function subscriptHash(index, s, type) {
         input.seq = 0;
     });
   } else if ((type & 0x1f) === constants.hashType.single) {
+    // bitcoind sighash_single bug:
+    if (index >= copy.outputs.length)
+      return constants.oneHash;
     while (copy.outputs.length < index + 1)
       copy.outputs.push({});
     while (copy.outputs.length > index + 1)
@@ -434,8 +442,7 @@ TX.prototype.subscriptHash = function subscriptHash(index, s, type) {
     copy.outputs.forEach(function(output, i) {
       if (i !== index) {
         output.script = [];
-        // output.value = new bn('ffffffffffffffff', 'hex');
-        output.value = [0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff];
+        output.value = utils.toArray('ffffffffffffffff', 'hex');
         output.value.toArray = function() { return this; };
       }
     });