Migrate to @signinwithethereum/siwe (#1074)

* chore: migrate @magic-ext/siwe to @signinwithethereum/siwe

Replace the legacy "siwe" dependency with "@signinwithethereum/siwe"@^4.1.0 for the @magic-ext/siwe package and update source imports accordingly. Updated packages/@magic-ext/siwe/package.json to use the new package and changed the SiweMessage import in src/index.ts. yarn.lock was regenerated to capture the new dependency resolution.

* Include issuedAt timestamp in SIWE message

Add an issuedAt field to the SIWE message payload set to the current time (new Date().toISOString()). This ensures generated SIWE messages include the issuance timestamp (per EIP-4361 expectations), aiding verification and time-based checks.

Author: caveman-eth

packages/@magic-ext/siwe/package.json

@@ -28,7 +28,7 @@
     ]
   },
   "dependencies": {
-    "siwe": "^3.0.0"
+    "@signinwithethereum/siwe": "^4.1.0"
   },
   "peerDependencies": {
     "ethers": "^6.0.0"

packages/@magic-ext/siwe/src/index.ts

@@ -1,5 +1,5 @@
 import { Extension } from '@magic-sdk/provider';
-import { SiweMessage } from 'siwe';
+import { SiweMessage } from '@signinwithethereum/siwe';
 import { SiwePayloadMethod, SiweGenerateNonceParams, SiweGenerateMessageParams, SiweLoginParams } from './types';
 
 export class SiweExtension extends Extension.Internal<'siwe'> {
@@ -27,6 +27,7 @@ export class SiweExtension extends Extension.Internal<'siwe'> {
       version: '1',
       chainId: params.chainId || 1,
       nonce,
+      issuedAt: new Date().toISOString(),
     });
 
     return siweMessage.prepareMessage();