Evidence row 573148

What was observed

{
  "count": 2,
  "tools": [
    {
      "description": "List every supported country and territory with its ISO code, English name, whether it uses postal codes, a format example and the local name for the code (zip, eircode, PIN…). Read-only. Same data as GET /v1/countries.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "list_countries"
    },
    {
      "description": "Check whether a postal code has a valid format for a country and return its normalized form (uppercase, official space or hyphen), a format example and the country name. Example: country \"NL\", code \"1234ab\" → valid true, normalized \"1234 AB\". Format check only (Google libaddressinput patterns): it does not confirm the code exists or is deliverable. Countries without postal codes return valid false with reason \"no_postal_codes\". Read-only. Same engine as GET /v1/validate.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "code": {
            "description": "The postal code to check, e.g. \"SW1A 1AA\", \"94103\", \"10115\".",
            "maxLength": 32,
            "minLength": 1,
            "type": "string"
          },
          "country": {
            "description": "ISO 3166-1 alpha-2 country code, e.g. \"US\", \"GB\", \"DE\" (case-insensitive; \"UK\" accepted).",
            "maxLength": 2,
            "minLength": 2,
            "type": "string"
          }
        },
        "required": [
          "country",
          "code"
        ],
        "type": "object"
      },
      "name": "validate_postcode"
    }
  ]
}

What the leaf hashes

{"body":"06b7338954159384612cc128202c3ed45beee002059dc6f5254da47dbf4c2e02","id":573148,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793140957330238,"prev":null,"subject":"33926930-5ef3-41c9-937f-cf7826e8a1ff","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0xdca0992c0e437a4992d597ea463b945c9aaa80012a98884cec4f8b7e1499a714
2. 0x07cb736173ac5fbcb04bfb6d37cf71af94c56deebec5243d3bbcf39fded41511
3. 0x5f2c24d80e4cb51787f9209b52737f3df34c51a295d8cca16022552b6c07143d
4. 0x1931a9a50246cdec2b150d01058103735a066f088290a438310fe4e16e3a2a30
5. 0x61a2f1ecb7ace4075b49d4b7292b493a4aa9bdd0adc36505ade0806f43a0d517
6. 0x6a7f1fce523174aa7e9033a681306c69cfc061d22eb7b694e391d6196df2a0f0
7. 0xcae83626cb93a8cd6bd4d91f1041ac6d5cc192c08a6a884a5813c64197eb1043
8. 0xbcc193bfdb8137cdf3446503624fae7fc04152b0c00a9f1c9ffd026083478080
9. 0x1d89270c5dddd49fd9b6e6adf04b34d7ab41600cefec74f6c48306da6cf59331
10. 0xd041fc31177f879025c438c75a3956c116173e7c79932bb41a72b95c68aadcf5
11. 0xe7eebf475975d90d310c445a11de6a904d138911aeb29ce874f38db2815689d0
12. 0x1269bf9fca7c16778dd2b72e0163a91a5a288ca31d13ad19673e0d6ecf6de8d5
13. 0x9f8e192630bb5fc72241bfdb0460be2fccc141b3afd0197fe2e478dc28ce82a9
14. 0xd59f3e577867f5105dd7f75598f16da8286185e426dfcdafb84e733fde2b2492
15. 0x24e3e2bb8ee1e8d20756de35f0e0c4ec8eb1f193bd2cf3f077ee1f92f211c34d
16. 0x8745bd887f5ce9f7a49558fd2b04cdcd97a05ea9f8a23f62d0e80cb13d328b0f
17. 0xdf1105afdc109de3c09a98fc8a3864159ad964e6f49b635c105a27a1e1f14310
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4