From 5bcbc743b841023a325334c5aaf121d68cb3bf64 Mon Sep 17 00:00:00 2001
From: harkamal <gajinder@g11.in>
Date: Sat, 22 Jan 2022 15:01:54 +0530
Subject: [PATCH] Allow genesis PoW block to reach TTD

---
 packages/lodestar/src/eth1/eth1MergeBlockTracker.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/lodestar/src/eth1/eth1MergeBlockTracker.ts b/packages/lodestar/src/eth1/eth1MergeBlockTracker.ts
index 315575622b36..79ca8dcb9d70 100644
--- a/packages/lodestar/src/eth1/eth1MergeBlockTracker.ts
+++ b/packages/lodestar/src/eth1/eth1MergeBlockTracker.ts
@@ -289,6 +289,12 @@ export class Eth1MergeBlockTracker {
     // Check if this block is already visited
 
     while (block.totalDifficulty >= this.config.TERMINAL_TOTAL_DIFFICULTY) {
+      if (block.parentHash === ZERO_HASH_HEX) {
+        // Allow genesis block to reach TTD
+        // https://github.com/ethereum/consensus-specs/pull/2719
+        return this.setTerminalPowBlock(block);
+      }
+
       const parent = await this.getPowBlock(block.parentHash);
       // Unknown parent
       if (!parent) {