From b91fac6e9e32444dd6d1d86b5d5b7547567f565a Mon Sep 17 00:00:00 2001
From: Michael de Hoog <michael.dehoog@coinbase.com>
Date: Thu, 14 Nov 2024 09:47:58 -1000
Subject: [PATCH] Check blockhash is non-zero (#20)

---
 src/DeployChain.sol | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/DeployChain.sol b/src/DeployChain.sol
index 1c78d12..16fd7bd 100644
--- a/src/DeployChain.sol
+++ b/src/DeployChain.sol
@@ -167,6 +167,8 @@ contract DeployChain {
         DeployAddresses memory addresses
     ) internal view returns (Hashes memory) {
         bytes32 genesisL1Hash = blockhash(uint256(genesisConfig.l1Number));
+        require(genesisL1Hash != bytes32(0), "DeployChain: genesis blockhash not available");
+
         bytes32 scalar =
             bytes32((uint256(0x01) << 248) | (uint256(gasConfig.blobbasefeeScalar) << 32) | gasConfig.basefeeScalar);