=====================================================================
               PASSKEY AUTHENTICATION TRACE (SUCCESS)
=====================================================================
1. Server login challenge generated:
   Challenge (b64url): LAjE8sEVFmVCIrkwEvqv2iFFP1L37PnPl_uF8VICM1U

2. Browser constructs clientDataJSON:
   - canonical json: {"challenge":"LAjE8sEVFmVCIrkwEvqv2iFFP1L37PnPl_uF8VICM1U","origin":"https://rp.example.com","type":"webauthn.get"}

3. Authenticator builds authenticatorData (37 bytes):
   - RP ID Hash (32 bytes): fe828f3f47351b0833ab3076f76aa3f75e417db7ec028106bd325e80f025cad1
   - Flags (1 byte):        0x05 (User Present & Verified)
   - Sign Counter (4 bytes): 0x00000001 (Value: 1)
   - Raw authenticatorData (hex): fe828f3f47351b0833ab3076f76aa3f75e417db7ec028106bd325e80f025cad10500000001

4. Authenticator constructs signature payload:
   - clientDataHash (SHA-256): 643e0038fd473427f0eee3ac1ef8c295cbcd87c7e3388b3b7d74434ef057366e
   - signedPayload (authenticatorData + clientDataHash):
     fe828f3f47351b0833ab3076f76aa3f75e417db7ec028106bd325e80f025cad10500000001643e0038fd473427f0eee3ac1ef8c295cbcd87c7e3388b3b7d74434ef057366e

5. Authenticator signs payload with private key:
   - Computed Signature (hex): 3044022011fd9b06603a7673d5fb2af4a9b3a7edd4fc6be90c15e11773ac...[truncated]

6. Server performs verification checks:
   [CHECK 1] Credential ID exists? YES
   [CHECK 2] challenge matches server outstanding challenge? YES
   [CHECK 3] clientDataJSON origin matches expected origin 'https://rp.example.com'? YES
   [CHECK 4] SHA-256(rp_id) matches RP ID hash in authenticatorData? YES
   [CHECK 5] ECDSA signature verifies against stored public key? YES
   [CHECK 6] assertion sign counter (1) > previously stored counter (0)? YES

7. Verification Result:
   - Status: SUCCESS
   - Updated Stored Counter: 1
=====================================================================