hotfix: signature validotr dep (#613)

Author: coodos

infrastructure/signature-validator/src/index.ts

@@ -1,15 +1,6 @@
 import axios from "axios";
 import * as jose from "jose";
-
-// Lazy initialization for base58btc to handle ESM module resolution
-let base58btcModule: { base58btc: { decode: (input: string) => Uint8Array } } | null = null;
-
-async function getBase58btc() {
-  if (!base58btcModule) {
-    base58btcModule = await import("multiformats/bases/base58");
-  }
-  return base58btcModule.base58btc;
-}
+import { base58btc } from "multiformats/bases/base58";
 
 /**
  * Options for signature verification
@@ -68,7 +59,6 @@ async function decodeMultibasePublicKey(multibaseKey: string): Promise<Uint8Arra
 
   // Try base58btc (standard multibase 'z' prefix)
   try {
-    const base58btc = await getBase58btc();
     return base58btc.decode(encoded);
   } catch (error) {
     throw new Error(
@@ -87,7 +77,6 @@ async function decodeSignature(signature: string): Promise<Uint8Array> {
   // If it starts with 'z', it's multibase base58btc
   if (signature.startsWith("z")) {
     try {
-      const base58btc = await getBase58btc();
       return base58btc.decode(signature.slice(1));
     } catch (error) {
       throw new Error(`Failed to decode multibase signature: ${error instanceof Error ? error.message : String(error)}`);