From b02e8802fd395e6ca6423cac3c6fb18f380ace37 Mon Sep 17 00:00:00 2001
From: Chris Duncan <chris@codecow.com>
Date: Sat, 8 Aug 2026 14:49:18 -0700
Subject: [PATCH] Fix frontier regex and allow special '0' opening block value.

---
 src/lib/block/index.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/lib/block/index.ts b/src/lib/block/index.ts
index bb8a893..23fb95c 100644
--- a/src/lib/block/index.ts
+++ b/src/lib/block/index.ts
@@ -80,7 +80,7 @@ export class Block {
 			if (typeof previous !== 'string') {
 				throw new TypeError('Account frontier is unknown')
 			}
-			if (!(/^([0-9A-F]{2}){1,64}$/i.test(previous))) {
+			if (!hex.is(previous, 64) && previous !== '0') {
 				throw new RangeError('Invalid frontier hash')
 			}
 			this.account = account
-- 
2.52.0