From 5dc6db0b8e18c55b8d065dd22b704389e33bb79d Mon Sep 17 00:00:00 2001
From: garrettmills <shout@garrettmills.dev>
Date: Sat, 10 Apr 2021 03:51:21 -0500
Subject: [PATCH] Add support for checking for genesis block

---
 src/app/units/Blockchain.ts | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/app/units/Blockchain.ts b/src/app/units/Blockchain.ts
index 53412e1..42c6195 100644
--- a/src/app/units/Blockchain.ts
+++ b/src/app/units/Blockchain.ts
@@ -29,6 +29,12 @@ export class Block implements BlockResourceItem {
         this.proof = rec.proof;
     }
 
+    /** Returns true if this is the genesis block. */
+    isGenesis() {
+        // FIXME sign this with GPG to verify that it came from here
+        return this.uuid === '0000'
+    }
+
     /** Generate the hash for this block. */
     hash() {
         return crypto.createHash('sha256')
@@ -119,8 +125,7 @@ export class Blockchain extends Unit {
     public async validate(chain: Block[]) {
         const blocks = collect<Block>(chain)
         return blocks.every((block: Block, idx: number) => {
-            if ( idx === 0 ) return true;  // TODO handle genesis
-
+            if ( idx === 0 ) return block.isGenesis()
             return block.lastBlockHash === blocks.at(idx)!.hash()
         })
     }