From fbe047a5b3a5a563f60f5769525a9860cecd31b9 Mon Sep 17 00:00:00 2001
From: Pi Lanningham <pi.lanningham@gmail.com>
Date: Sat, 31 Aug 2024 08:24:40 -0400
Subject: [PATCH] chore: make script data hash only valid for chang (#130)

Credit to @cjkoepke
---
 .changeset/afraid-ads-happen.md | 5 +++++
 packages/blaze-tx/src/tx.ts     | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/afraid-ads-happen.md

diff --git a/.changeset/afraid-ads-happen.md b/.changeset/afraid-ads-happen.md
new file mode 100644
index 0000000..ba2e8ef
--- /dev/null
+++ b/.changeset/afraid-ads-happen.md
@@ -0,0 +1,5 @@
+---
+"@blaze-cardano/tx": minor
+---
+
+This checks the protocol version to determine if the new script data hash requirements are current yet or not.
diff --git a/packages/blaze-tx/src/tx.ts b/packages/blaze-tx/src/tx.ts
index 43192ae..ac59740 100644
--- a/packages/blaze-tx/src/tx.ts
+++ b/packages/blaze-tx/src/tx.ts
@@ -955,7 +955,9 @@ export class TxBuilder {
       // Initialize a CBOR writer to encode the script data.
       const writer = new CborWriter();
       // Encode redeemers and datums into CBOR format.
-      if (redeemers.length === 0) {
+      // In the conway era, the format changes
+      const conway = this.params.protocolVersion.major === 9;
+      if (conway && redeemers.length === 0) {
         // An empty redeemer set is always an empty map, as of conway
         writer.writeStartMap(0);
       } else {