updated _estimateSize for bare multisig input

lib/transaction/input/multisig.js

@@ -200,14 +200,12 @@ MultiSigInput.normalizeSignatures = function(transaction, input, inputIndex, sig
   });
 };
 
-MultiSigInput.OPCODES_SIZE = 7; // serialized size (<=3) + 0 .. N .. M OP_CHECKMULTISIG
-MultiSigInput.SIGNATURE_SIZE = 74; // size (1) + DER (<=72) + sighash (1)
-MultiSigInput.PUBKEY_SIZE = 34; // size (1) + DER (<=33)
+MultiSigInput.OPCODES_SIZE = 1; // 0
+MultiSigInput.SIGNATURE_SIZE = 73; // size (1) + DER (<=72)
 
 MultiSigInput.prototype._estimateSize = function() {
   return MultiSigInput.OPCODES_SIZE +
-    this.threshold * MultiSigInput.SIGNATURE_SIZE +
-    this.publicKeys.length * MultiSigInput.PUBKEY_SIZE;
+    this.threshold * MultiSigInput.SIGNATURE_SIZE;
 };
 
 module.exports = MultiSigInput;

test/transaction/input/multisig.js

@@ -101,7 +101,7 @@ describe('MultiSigInput', function() {
       .from(output, [public1, public2, public3], 2)
       .to(address, 1000000);
     var input = transaction.inputs[0];
-    input._estimateSize().should.equal(257);
+    input._estimateSize().should.equal(147);
   });
   it('uses SIGHASH_ALL by default', function() {
     var transaction = new Transaction()