{
  "spec": "gaip-receipt-v1",
  "note": "Test-only keys; they sign nothing real.",
  "keys_document": {
    "schema_version": "gaip.receipt-keys.v1",
    "algorithm": "Ed25519",
    "keys": [
      {
        "kid": "14c97c7cbe3a668c",
        "kty": "OKP",
        "crv": "Ed25519",
        "x": "3yu0EqiHgSgQ_jNwJwHixkFpk_9kxg6H_tmy06TsN08",
        "alg": "EdDSA",
        "use": "sig",
        "status": "ACTIVE",
        "created_at": "2026-10-01T00:00:00Z"
      },
      {
        "kid": "45ae2e5fddfdf28a",
        "kty": "OKP",
        "crv": "Ed25519",
        "x": "6wftPF_B3qSJHNNZ9_WKl7xIVXCku4bGYTqJ57lJeqU",
        "alg": "EdDSA",
        "use": "sig",
        "status": "RETIRED",
        "created_at": "2026-10-01T00:00:00Z",
        "retired_at": "2026-10-05T00:00:00Z",
        "retired_reason": "ROTATED"
      },
      {
        "kid": "6adbb40cbbc422b1",
        "kty": "OKP",
        "crv": "Ed25519",
        "x": "OK-uS9gqnpC57HK3CaFn2P4aEPr_3MNPiLeZPwhXgFw",
        "alg": "EdDSA",
        "use": "sig",
        "status": "RETIRED",
        "created_at": "2026-10-01T00:00:00Z",
        "retired_at": "2026-10-05T00:00:00Z",
        "retired_reason": "COMPROMISED"
      }
    ]
  },
  "cases": [
    {
      "name": "good OFFER_SEEN receipt",
      "receipt": {
        "schema_version": "gaip.second_look.receipt.v1",
        "service": "SECOND_LOOK",
        "evidence_class": "OFFER_SEEN",
        "brand": "Second Look by GAIP",
        "observed_at_utc": "2026-10-08T12:00:00Z",
        "product": {
          "url": "https://shop.example/products/coat",
          "seller_domain": "shop.example",
          "name": "Wool coat – navy",
          "variant": [
            "M"
          ]
        },
        "shop_showed": {
          "price": "79.00",
          "currency": "GBP",
          "in_stock": true
        },
        "you_were_told": {
          "price": "79.00",
          "currency": "GBP",
          "claim_text": "£79, size M"
        },
        "verdict": "MATCHES",
        "price_gbp": 0,
        "external_effect": false,
        "receipt_id": "sl-testvector0001",
        "observation_id": "second-look:sl-testvector0001",
        "offer_sha256": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
        "signature": {
          "alg": "Ed25519",
          "kid": "14c97c7cbe3a668c",
          "sig": "8rvfQSR1N0IesUF05nACOeXmx9PI6OM9ggGAl-ABewYOo5xtZJPEB3WQu_G5etNCcztY-dOE1yBE5_s8DMG1Dg",
          "purpose": "gaip.second_look.offer_sha256.v1",
          "signed_digest": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "signed_message": "gaip.second_look.offer_sha256.v1:7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
        },
        "signature_status": "SIGNED"
      },
      "valid": true,
      "reason": "SIGNATURE_VALID"
    },
    {
      "name": "tampered OFFER_SEEN receipt (price changed after signing)",
      "receipt": {
        "schema_version": "gaip.second_look.receipt.v1",
        "service": "SECOND_LOOK",
        "evidence_class": "OFFER_SEEN",
        "brand": "Second Look by GAIP",
        "observed_at_utc": "2026-10-08T12:00:00Z",
        "product": {
          "url": "https://shop.example/products/coat",
          "seller_domain": "shop.example",
          "name": "Wool coat – navy",
          "variant": [
            "M"
          ]
        },
        "shop_showed": {
          "price": "59.00",
          "currency": "GBP",
          "in_stock": true
        },
        "you_were_told": {
          "price": "79.00",
          "currency": "GBP",
          "claim_text": "£79, size M"
        },
        "verdict": "MATCHES",
        "price_gbp": 0,
        "external_effect": false,
        "receipt_id": "sl-testvector0001",
        "observation_id": "second-look:sl-testvector0001",
        "offer_sha256": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
        "signature": {
          "alg": "Ed25519",
          "kid": "14c97c7cbe3a668c",
          "sig": "8rvfQSR1N0IesUF05nACOeXmx9PI6OM9ggGAl-ABewYOo5xtZJPEB3WQu_G5etNCcztY-dOE1yBE5_s8DMG1Dg",
          "purpose": "gaip.second_look.offer_sha256.v1",
          "signed_digest": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "signed_message": "gaip.second_look.offer_sha256.v1:7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
        },
        "signature_status": "SIGNED"
      },
      "valid": false,
      "reason": "RECEIPT_CHANGED_SINCE_SIGNING"
    },
    {
      "name": "OFFER_SEEN receipt bound to a continuity handle (handle_hash beside the signed body)",
      "receipt": {
        "schema_version": "gaip.second_look.receipt.v1",
        "service": "SECOND_LOOK",
        "evidence_class": "OFFER_SEEN",
        "brand": "Second Look by GAIP",
        "observed_at_utc": "2026-10-08T12:00:00Z",
        "product": {
          "url": "https://shop.example/products/coat",
          "seller_domain": "shop.example",
          "name": "Wool coat – navy",
          "variant": [
            "M"
          ]
        },
        "shop_showed": {
          "price": "79.00",
          "currency": "GBP",
          "in_stock": true
        },
        "you_were_told": {
          "price": "79.00",
          "currency": "GBP",
          "claim_text": "£79, size M"
        },
        "verdict": "MATCHES",
        "price_gbp": 0,
        "external_effect": false,
        "receipt_id": "sl-testvector0001",
        "observation_id": "second-look:sl-testvector0001",
        "offer_sha256": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
        "signature": {
          "alg": "Ed25519",
          "kid": "14c97c7cbe3a668c",
          "sig": "8rvfQSR1N0IesUF05nACOeXmx9PI6OM9ggGAl-ABewYOo5xtZJPEB3WQu_G5etNCcztY-dOE1yBE5_s8DMG1Dg",
          "purpose": "gaip.second_look.offer_sha256.v1",
          "signed_digest": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "signed_message": "gaip.second_look.offer_sha256.v1:7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
        },
        "signature_status": "SIGNED",
        "handle_hash": "745b6a3e256b74ac4c17a6417315f1ee63d03cb01f97701585510b26fa75cd50"
      },
      "valid": true,
      "reason": "SIGNATURE_VALID"
    },
    {
      "name": "OFFER_SEEN receipt whose handle binding was dropped after 90 days",
      "receipt": {
        "schema_version": "gaip.second_look.receipt.v1",
        "service": "SECOND_LOOK",
        "evidence_class": "OFFER_SEEN",
        "brand": "Second Look by GAIP",
        "observed_at_utc": "2026-10-08T12:00:00Z",
        "product": {
          "url": "https://shop.example/products/coat",
          "seller_domain": "shop.example",
          "name": "Wool coat – navy",
          "variant": [
            "M"
          ]
        },
        "shop_showed": {
          "price": "79.00",
          "currency": "GBP",
          "in_stock": true
        },
        "you_were_told": {
          "price": "79.00",
          "currency": "GBP",
          "claim_text": "£79, size M"
        },
        "verdict": "MATCHES",
        "price_gbp": 0,
        "external_effect": false,
        "receipt_id": "sl-testvector0001",
        "observation_id": "second-look:sl-testvector0001",
        "offer_sha256": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
        "signature": {
          "alg": "Ed25519",
          "kid": "14c97c7cbe3a668c",
          "sig": "8rvfQSR1N0IesUF05nACOeXmx9PI6OM9ggGAl-ABewYOo5xtZJPEB3WQu_G5etNCcztY-dOE1yBE5_s8DMG1Dg",
          "purpose": "gaip.second_look.offer_sha256.v1",
          "signed_digest": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "signed_message": "gaip.second_look.offer_sha256.v1:7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
        },
        "signature_status": "SIGNED",
        "handle_hash": null,
        "handle_hash_retention": {
          "state": "HANDLE_HASH_DROPPED_AFTER_RETENTION",
          "rule": "gaip.handle-hash-retention.v1",
          "days": 90,
          "receipt_date": "2026-10-08",
          "dropped_on": "2027-01-06"
        }
      },
      "valid": true,
      "reason": "SIGNATURE_VALID"
    },
    {
      "name": "signed by a key that is not published",
      "receipt": {
        "schema_version": "gaip.second_look.receipt.v1",
        "service": "SECOND_LOOK",
        "evidence_class": "OFFER_SEEN",
        "brand": "Second Look by GAIP",
        "observed_at_utc": "2026-10-08T12:00:00Z",
        "product": {
          "url": "https://shop.example/products/coat",
          "seller_domain": "shop.example",
          "name": "Wool coat – navy",
          "variant": [
            "M"
          ]
        },
        "shop_showed": {
          "price": "79.00",
          "currency": "GBP",
          "in_stock": true
        },
        "you_were_told": {
          "price": "79.00",
          "currency": "GBP",
          "claim_text": "£79, size M"
        },
        "verdict": "MATCHES",
        "price_gbp": 0,
        "external_effect": false,
        "receipt_id": "sl-testvector0001",
        "observation_id": "second-look:sl-testvector0001",
        "offer_sha256": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
        "signature": {
          "alg": "Ed25519",
          "kid": "d61b3d052f7cf061",
          "sig": "KRgToCXiB2-1Ni0eLF2AlCzhdc8Vtvgaz_IQFlZPuTM8gdJZeoQLg6KkPsDJS4gG4MMTHEutBmGryPh-c3rxDA",
          "purpose": "gaip.second_look.offer_sha256.v1",
          "signed_digest": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "signed_message": "gaip.second_look.offer_sha256.v1:7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
        },
        "signature_status": "SIGNED"
      },
      "valid": false,
      "reason": "UNKNOWN_KEY"
    },
    {
      "name": "signed by a retired key (still valid)",
      "receipt": {
        "schema_version": "gaip.second_look.receipt.v1",
        "service": "SECOND_LOOK",
        "evidence_class": "OFFER_SEEN",
        "brand": "Second Look by GAIP",
        "observed_at_utc": "2026-10-08T12:00:00Z",
        "product": {
          "url": "https://shop.example/products/coat",
          "seller_domain": "shop.example",
          "name": "Wool coat – navy",
          "variant": [
            "M"
          ]
        },
        "shop_showed": {
          "price": "79.00",
          "currency": "GBP",
          "in_stock": true
        },
        "you_were_told": {
          "price": "79.00",
          "currency": "GBP",
          "claim_text": "£79, size M"
        },
        "verdict": "MATCHES",
        "price_gbp": 0,
        "external_effect": false,
        "receipt_id": "sl-testvector0001",
        "observation_id": "second-look:sl-testvector0001",
        "offer_sha256": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
        "signature": {
          "alg": "Ed25519",
          "kid": "45ae2e5fddfdf28a",
          "sig": "wgTAoG37SCKFaI6VL8a-OBmnRNYG9Jfjx1ps-8IZ-JTuHYCzCiDyCsvmzOmy5vvX4Nk6lic6cmSikGKVDlP6AA",
          "purpose": "gaip.second_look.offer_sha256.v1",
          "signed_digest": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "signed_message": "gaip.second_look.offer_sha256.v1:7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
        },
        "signature_status": "SIGNED"
      },
      "valid": true,
      "reason": "SIGNATURE_VALID",
      "key_status": "RETIRED"
    },
    {
      "name": "signed by a key retired as COMPROMISED",
      "receipt": {
        "schema_version": "gaip.second_look.receipt.v1",
        "service": "SECOND_LOOK",
        "evidence_class": "OFFER_SEEN",
        "brand": "Second Look by GAIP",
        "observed_at_utc": "2026-10-08T12:00:00Z",
        "product": {
          "url": "https://shop.example/products/coat",
          "seller_domain": "shop.example",
          "name": "Wool coat – navy",
          "variant": [
            "M"
          ]
        },
        "shop_showed": {
          "price": "79.00",
          "currency": "GBP",
          "in_stock": true
        },
        "you_were_told": {
          "price": "79.00",
          "currency": "GBP",
          "claim_text": "£79, size M"
        },
        "verdict": "MATCHES",
        "price_gbp": 0,
        "external_effect": false,
        "receipt_id": "sl-testvector0001",
        "observation_id": "second-look:sl-testvector0001",
        "offer_sha256": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
        "signature": {
          "alg": "Ed25519",
          "kid": "6adbb40cbbc422b1",
          "sig": "r4928BPQXhppdxz6ews8aerpu0PvllG7YZ79BBi2woaGsO2bYEUXjJ_QzGTa66JxjAMRj4jovgn5Uzo7swheDw",
          "purpose": "gaip.second_look.offer_sha256.v1",
          "signed_digest": "7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "signed_message": "gaip.second_look.offer_sha256.v1:7628fd8ad290813eb7fea56eb63503a09a30c8ad200b6d202aa0d89e43adbe21",
          "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
        },
        "signature_status": "SIGNED"
      },
      "valid": false,
      "reason": "KEY_COMPROMISED"
    },
    {
      "name": "signature object alone (History Spine record digest)",
      "receipt": {
        "alg": "Ed25519",
        "kid": "14c97c7cbe3a668c",
        "sig": "E5mUkRbPvjGwf57Ukk2wsqTVRNHGRtfcimpkNcJQFyhdazaOSzOiomSpAbwA9AWfBRlYndVPkT2Ob7NAtKmRAA",
        "purpose": "gaip.record_sha256.v1",
        "signed_digest": "20558f8a3c46f09a43eacd3108b2c6c6b6db15d18381bf121a70909e03ac7cec",
        "signed_message": "gaip.record_sha256.v1:20558f8a3c46f09a43eacd3108b2c6c6b6db15d18381bf121a70909e03ac7cec",
        "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
      },
      "valid": true,
      "reason": "SIGNATURE_VALID"
    },
    {
      "name": "signature object with a different digest",
      "receipt": {
        "alg": "Ed25519",
        "kid": "14c97c7cbe3a668c",
        "sig": "E5mUkRbPvjGwf57Ukk2wsqTVRNHGRtfcimpkNcJQFyhdazaOSzOiomSpAbwA9AWfBRlYndVPkT2Ob7NAtKmRAA",
        "purpose": "gaip.record_sha256.v1",
        "signed_digest": "0000000000000000000000000000000000000000000000000000000000000000",
        "signed_message": "gaip.record_sha256.v1:20558f8a3c46f09a43eacd3108b2c6c6b6db15d18381bf121a70909e03ac7cec",
        "keys_url": "https://www.gaipagents.com/.well-known/gaip-receipt-keys.json"
      },
      "valid": false,
      "reason": "SIGNATURE_DOES_NOT_MATCH"
    }
  ]
}