From 3e8f3bf8ede4d29eb902d5db8af6299a095d0423 Mon Sep 17 00:00:00 2001
From: grumbach <anselmega@gmail.com>
Date: Tue, 13 Jun 2023 22:15:57 +0900
Subject: [PATCH] feat: include parent tx in spend

---
 src/builder.rs      | 2 +-
 src/signed_spend.rs | 9 +++++----
 src/spentbook.rs    | 2 +-
 src/verification.rs | 6 +++---
 4 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/src/builder.rs b/src/builder.rs
index dd92ad1..41b4211 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -138,7 +138,7 @@ impl TransactionBuilder {
                             spent_tx: spent_tx.clone(),
                             reason,
                             blinded_amount: input.blinded_amount,
-                            dbc_creation_tx_hash: i.input_src_tx.hash(),
+                            dbc_creation_tx: i.input_src_tx.clone(),
                         };
                         let derived_key_sig = i.input.derived_key.sign(&spend.to_bytes());
                         SignedSpend {
diff --git a/src/signed_spend.rs b/src/signed_spend.rs
index c489d21..5427c92 100644
--- a/src/signed_spend.rs
+++ b/src/signed_spend.rs
@@ -42,7 +42,7 @@ impl SignedSpend {
 
     /// Get the hash of the transaction this DBC was created in
     pub fn dbc_creation_tx_hash(&self) -> Hash {
-        self.spend.dbc_creation_tx_hash
+        self.spend.dbc_creation_tx.hash()
     }
 
     /// Get blinded amount.
@@ -119,20 +119,21 @@ pub struct Spend {
     /// The amount of the input Dbc.
     #[debug(skip)]
     pub blinded_amount: BlindedAmount,
-    /// The hash of the transaction that the input Dbc was created in.
+    /// The transaction that the input Dbc was created in.
     #[debug(skip)]
-    pub dbc_creation_tx_hash: Hash,
+    pub dbc_creation_tx: DbcTransaction,
 }
 
 impl Spend {
     /// Represent this Spend as bytes.
+    /// There is no from_bytes, because this function is not symetric as it uses hashes
     pub fn to_bytes(&self) -> Vec<u8> {
         let mut bytes: Vec<u8> = Default::default();
         bytes.extend(self.dbc_id.to_bytes());
         bytes.extend(self.spent_tx.hash().as_ref());
         bytes.extend(self.reason.as_ref());
         bytes.extend(self.blinded_amount.compress().to_bytes());
-        bytes.extend(self.dbc_creation_tx_hash.as_ref());
+        bytes.extend(self.dbc_creation_tx.hash().as_ref());
         bytes
     }
 
diff --git a/src/spentbook.rs b/src/spentbook.rs
index 155ce47..46e4225 100644
--- a/src/spentbook.rs
+++ b/src/spentbook.rs
@@ -295,7 +295,7 @@ mod tests {
                             spent_tx: signed_spend.spend.spent_tx.clone(),
                             reason: Hash::default(),
                             blinded_amount: *signed_spend.blinded_amount(),
-                            dbc_creation_tx_hash: tx1.hash(),
+                            dbc_creation_tx: tx1.clone(),
                         },
                         derived_key_sig: SecretKey::random().sign([0u8; 32]),
                     }
diff --git a/src/verification.rs b/src/verification.rs
index 9de9b8c..5e9440f 100644
--- a/src/verification.rs
+++ b/src/verification.rs
@@ -109,15 +109,15 @@ pub fn get_blinded_amounts_from_transaction(
     // Get txs that are referenced by the signed spends.
     let mut referenced_spent_txs: Vec<_> = vec![];
     for input in input_signed_spends {
-        if let Some(src_tx) = spent_src_transactions.get(&input.spend.dbc_creation_tx_hash) {
-            if src_tx.hash() == input.spend.dbc_creation_tx_hash {
+        if let Some(src_tx) = spent_src_transactions.get(&input.spend.dbc_creation_tx.hash()) {
+            if src_tx.hash() == input.spend.dbc_creation_tx.hash() {
                 referenced_spent_txs.push(src_tx);
                 continue;
             }
         }
         return Err(Error::MissingSpentSrcTransaction {
             dbc_id: *input.dbc_id(),
-            dbc_creation_tx_hash: input.spend.dbc_creation_tx_hash,
+            dbc_creation_tx_hash: input.spend.dbc_creation_tx.hash(),
         });
     }