From c37e6f4759604d662514772cf8a9ceb3c685a82a Mon Sep 17 00:00:00 2001
From: sergerad <serge.radinovich@immutable.com>
Date: Fri, 30 Aug 2024 15:45:29 +1200
Subject: [PATCH] B256 parent_digest

---
 rollup/src/block.rs     | 2 +-
 rollup/src/sequencer.rs | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/rollup/src/block.rs b/rollup/src/block.rs
index 452de7b..7057d22 100644
--- a/rollup/src/block.rs
+++ b/rollup/src/block.rs
@@ -14,7 +14,7 @@ pub struct BlockHeader {
     /// The timestamp at the time the block was sealed.
     pub timestamp: u64,
     /// The hash of the parent block. None if this is the genesis block.
-    pub parent_digest: Option<String>,
+    pub parent_digest: Option<B256>,
     /// The root digest of the withdrawals Merkle tree.
     pub withdrawals_root: String,
     /// The root digest of the transactions Merkle tree.
diff --git a/rollup/src/sequencer.rs b/rollup/src/sequencer.rs
index 9b1b736..f193bdc 100644
--- a/rollup/src/sequencer.rs
+++ b/rollup/src/sequencer.rs
@@ -66,7 +66,7 @@ impl Sequencer {
             sequencer: self.signer.address,
             number: self.blockchain.height(),
             timestamp: block_time,
-            parent_digest: self.blockchain.head().map(|b| b.hash().to_string()),
+            parent_digest: self.blockchain.head().map(|b| b.hash()),
             withdrawals_root: format!("{:x}", self.blockchain.withdrawals_tree.root()),
             transactions_root: format!("{:x}", self.blockchain.transactions_tree.root()),
         };