From 4b4b04a52cf3431a20227c5cb6368bf01eaa46bd Mon Sep 17 00:00:00 2001
From: Ben <wilsob12@gmail.com>
Date: Sun, 9 Jul 2023 11:47:07 -0400
Subject: [PATCH] update witness commit

---
 src/models/MiningJob.ts | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/models/MiningJob.ts b/src/models/MiningJob.ts
index 23e415c..4bff540 100644
--- a/src/models/MiningJob.ts
+++ b/src/models/MiningJob.ts
@@ -105,6 +105,11 @@ export class MiningJob {
         testBlock.merkleRoot = this.calculateMerkleRootHash(testBlock.transactions[0].getHash(false), this.merkle_branch);
         testBlock.witnessCommit = bitcoinjs.Block.calculateMerkleRoot(this.block.transactions, true);
 
+        const segwitMagicBits = Buffer.from('aa21a9ed', 'hex');
+        //    32-byte - Commitment hash: Double-SHA256(witness root hash|witness reserved value)
+        const commitmentHash = this.sha256(this.sha256(Buffer.concat([testBlock.witnessCommit, testBlock.transactions[0].ins[0].witness[0]])));
+        testBlock.transactions[0].outs[testBlock.transactions[0].outs.length - 1].script = bitcoinjs.script.compile([bitcoinjs.opcodes.OP_RETURN, Buffer.concat([segwitMagicBits, commitmentHash])])
+
         testBlock.timestamp = timestamp;
 
         return testBlock;