diff --git a/src/transaction.js b/src/transaction.js
index 1d53c82..cd1fcf1 100644
--- a/src/transaction.js
+++ b/src/transaction.js
@@ -19,7 +19,7 @@ export default class Transaction {
         const tx = clone(transaction)
         // TODO: set fulfillments to null
         // Sort the keys
-        return stableStringify(tx, (a, b) => (a.key > b.key ? 1 : -1))
+        return stableStringify(this.tx, (a, b) => (a.key > b.key ? 1 : -1))
     }
 
     makeInputTemplate(publicKeys = [], fulfills = null, fulfillment = null) {
@@ -59,7 +59,7 @@ export default class Transaction {
         tx.outputs = outputs
 
         // Hashing must be done after, as the hash is of the Transaction (up to now)
-        tx.id = hashTransaction(tx)
+        tx.id = this.hashTransaction(tx)
         return tx
     }
 
@@ -93,7 +93,7 @@ export default class Transaction {
 
     /**
      * @public
-     * Create an Ed25519 Cryptocondition from an Ed25519 public key 
+     * Create an Ed25519 Cryptocondition from an Ed25519 public key
      * to put into an Output of a Transaction
      * @param {string} publicKey base58 encoded Ed25519 public key for the recipient of the Transaction
      * @param {boolean} [json=true] If true returns a json object otherwise a crypto-condition type