From 5e1d8c743c16d55e38e551a474a4dca9b8b56c2d Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Sat, 28 Jan 2017 19:29:16 -0800
Subject: [PATCH] chain: add genesis check.

---
 lib/blockchain/chain.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/blockchain/chain.js b/lib/blockchain/chain.js
index c78e6f22..91d4b3aa 100644
--- a/lib/blockchain/chain.js
+++ b/lib/blockchain/chain.js
@@ -1143,6 +1143,12 @@ Chain.prototype._add = co(function* add(block) {
     // Mark the start time.
     this.mark();
 
+    // Special case for genesis block.
+    if (hash === this.network.genesis.hash) {
+      this.emit('exists', block, block.getCoinbaseHeight());
+      throw new VerifyError(block, 'duplicate', 'duplicate', 0);
+    }
+
     // Do we already have this block in the queue?
     if (this.hasPending(hash)) {
       this.emit('exists', block, block.getCoinbaseHeight());