From f19e2dd6be957f3c5a11413af72be41b714f6bed Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 18 Jan 2026 23:44:29 +0000
Subject: [PATCH 1/2] Initial plan


From 5866693082234d110d66bedc4bc65090b1d66ce2 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sun, 18 Jan 2026 23:46:58 +0000
Subject: [PATCH 2/2] Replace hardcoded 'zQ3sh' with
 SECP256K1_PUBLIC_MULTIBASE_PREFIX constant

Co-authored-by: johnbillion <208434+johnbillion@users.noreply.github.com>
---
 src/keys.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/keys.ts b/src/keys.ts
index 9f70551..9579d6b 100644
--- a/src/keys.ts
+++ b/src/keys.ts
@@ -299,9 +299,9 @@ export async function getRotationPublicKeyMultibase(keyInput: string): Promise<s
 	// Handle did:key format
 	if (trimmed.startsWith(DID_KEY_PREFIX)) {
 		const multibase = trimmed.slice(DID_KEY_PREFIX.length);
-		if (!multibase.startsWith('zQ3sh')) {
+		if (!multibase.startsWith(SECP256K1_PUBLIC_MULTIBASE_PREFIX)) {
 			throw new RotationKeyInputError(
-				`Invalid rotation key format. Expected a Secp256k1 key starting with 'zQ3sh', got '${multibase.slice(0, 5)}...'`,
+				`Invalid rotation key format. Expected a Secp256k1 key starting with '${SECP256K1_PUBLIC_MULTIBASE_PREFIX}', got '${multibase.slice(0, 5)}...'`,
 			);
 		}
 		// Validate by decoding and checking structure