{
  "harness_run": "harness-2026-05-04-A",
  "step": 6,
  "rail": "SpectralZK",
  "label": "SIGNED SAMPLE ARTIFACT",
  "timestamp": "2026-05-04T19:00:00-07:00",
  "body": {
    "proof_kind": "hktn_well_formed_v1",
    "proof_reference": "spzk_wf_demo_a_8a7c2f9d3b1e2a4c5e6f7d8c9b0a1f2e3d4c5b6a7f8e9d0c1b2a3f4e5d6c7b8a",
    "public_inputs_hash_hex": "6863d25479cf1c79025755cdcc6433caf0210c39227d1f0be19868a2e42d1e52",
    "statement_hash_hex": "b1aca1d94ecd82b858e9ee9bb367a33f3d3cf9c1569b839a5ea4a88552726fec",
    "verifier_metadata": {
      "verifier_url": "https://hive-passport.onrender.com/v1/hktn/HKTN-7Q9RX2NF8K-DEMO-A/prove/well-formed",
      "scheme": "spectralzk.profile.v1",
      "groth16_compat": true
    },
    "binding_to_receipt": "step_09_receipt.json",
    "_real_endpoint": "GET https://hive-passport.onrender.com/v1/hktn/<hktn>/prove/well-formed (LIVE for well-formedness; arbitrary-statement proofs are PILOT)",
    "_sample_reason": "Well-formedness proof is live for any minted HKTN. Sample uses demo HKTN. Arbitrary-statement Spectral-ZK is PILOT."
  },
  "signature": {
    "ed25519_sig_b64u_sample": "HUgE6vtq3z68qOFvzfLfDeqlAeFGS5I7NW1qzAKCTDQdSATq-2rfPryo4W_N8t8N6qUB4UZLkjs1bWrMAoJMNA",
    "issuer": "did:hive:hive-passport",
    "issuer_pubkey_b64u": "nxCpCWMw0EIYl5I37xFoSnaYNApu9nEZMNr370wfZgw",
    "alg": "Ed25519",
    "payload_canonical_sha256_hex": "1d4804eafb6adf3ebca8e16fcdf2df0deaa501e1464b923b356d6acc02824c34",
    "_label": "SIGNED SAMPLE \u2014 deterministic placeholder. Replace with real signature from POST https://hive-passport.onrender.com/v1/sign in production. Verify the canonical-hash + payload chain offline at /verify."
  },
  "self_sha256_hex": "3353ffbf6527b45014daa86c50c850307b03824fdc7f6f08f7aad3f1a7f32d6e"
}