diff --git a/src/libs/crypto/vc/passkeyDidPeer.ts b/src/libs/crypto/vc/passkeyDidPeer.ts
index 37476f51..5f64f490 100644
--- a/src/libs/crypto/vc/passkeyDidPeer.ts
+++ b/src/libs/crypto/vc/passkeyDidPeer.ts
@@ -398,11 +398,12 @@ export async function verifyJwtWebCrypto(
   const sigBuffer = Buffer.from(signature, "base64");
   const finalSigBuffer = unwrapEC2Signature(sigBuffer);
 
-  // Hash the client data
-  const hash = sha256(clientDataFromBase);
+  // Use challenge in preimage construction
+  const preimage = Buffer.concat([
+    authDataFromBase,
+    Buffer.from(challenge),
+  ]);
 
-  // Construct the preimage
-  const preimage = Buffer.concat([authDataFromBase, hash]);
   return verifyPeerSignature(preimage, issuerDid, finalSigBuffer);
 }