From 469f0cad9e751a5018c19842ca211f6702feb1c4 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Thu, 13 Mar 2025 09:37:57 +0100
Subject: [PATCH] eth: support earliest block in HeaderByNumber

---
 eth/api_backend.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/eth/api_backend.go b/eth/api_backend.go
index bf18c303c6..bce72aa806 100644
--- a/eth/api_backend.go
+++ b/eth/api_backend.go
@@ -91,7 +91,13 @@ func (b *EthAPIBackend) HeaderByNumber(ctx context.Context, number rpc.BlockNumb
 		}
 		return block, nil
 	}
-	return b.eth.blockchain.GetHeaderByNumber(uint64(number)), nil
+	var bn uint64
+	if number == rpc.EarliestBlockNumber {
+		bn = b.eth.blockchain.HistoryCutoff()
+	} else {
+		bn = uint64(number)
+	}
+	return b.eth.blockchain.GetHeaderByNumber(bn), nil
 }
 
 func (b *EthAPIBackend) HeaderByNumberOrHash(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (*types.Header, error) {