Evidence row 568583

What was observed

{
  "count": 3,
  "tools": [
    {
      "description": "Lists all bank (public) holidays for a region in a calendar year (default: the current year). Dates are ISO 8601 (YYYY-MM-DD) and local to the region. England, Scotland, Wales and Northern Ireland have different bank holidays, so choose the right region. Call list_regions for the valid country and region keys. Free for 100 calls per client per UTC day, then $0.001 USDC per call via x402.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "country": {
            "description": "Country key from list_regions, e.g. gb.",
            "type": "string"
          },
          "lang": {
            "description": "Language for holiday and region names. Default en.",
            "enum": [
              "en",
              "fr",
              "de",
              "es"
            ],
            "type": "string"
          },
          "region": {
            "description": "Region key from list_regions, e.g. scotland.",
            "type": "string"
          },
          "year": {
            "description": "Four-digit year. Default: current year.",
            "maximum": 9999,
            "minimum": 1000,
            "type": "integer"
          }
        },
        "required": [
          "country",
          "region"
        ],
        "type": "object"
      },
      "name": "list_bank_holidays"
    },
    {
      "description": "Lists the supported countries and regions (UK nations, Ireland, France, Germany and Spain regions) with their keys, ISO codes and timezones. Use these keys as the country and region inputs of the other tools. Always free and never counted against the allowance.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "lang": {
            "description": "Language for holiday and region names. Default en.",
            "enum": [
              "en",
              "fr",
              "de",
              "es"
            ],
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "list_regions"
    },
    {
      "description": "Returns the next bank (public) holiday for a region, and today's holiday if today is one (today_holiday), with the number of days until the next one. Dates are ISO 8601 (YYYY-MM-DD) and local to the region. England, Scotland, Wales and Northern Ireland have different bank holidays, so choose the right region. Call list_regions for the valid country and region keys. Free for 100 calls per client per UTC day, then $0.001 USDC per call via x402.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "country": {
            "description": "Country key from list_regions, e.g. gb, ie, fr, de, es.",
            "type": "string"
          },
          "lang": {
            "description": "Language for holiday and region names. Default en.",
            "enum": [
              "en",
              "fr",
              "de",
              "es"
            ],
            "type": "string"
          },
          "region": {
            "description": "Region key from list_regions, e.g. scotland, england.",
            "type": "string"
          }
        },
        "required": [
          "country",
          "region"
        ],
        "type": "object"
      },
      "name": "next_bank_holiday"
    }
  ]
}

What the leaf hashes

{"body":"f73490abf958733d9579fb95dbe68907f55bdb74c5999e6144d5a0c8a5145876","id":568583,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793139055322039,"prev":null,"subject":"a0d3e198-332f-453e-b6ff-fbd18ba8a281","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. 0xcb78698dab8f8107f62d43d06d5d1155969db8bbb4132d79d3c0f593dbab776e
2. 0x11ef3ff5098bf1bde78e02d538965c320c9ea612b7f4dcb7d7f2431d5ead4bd2
3. 0xa544fcb1ff95a06b454a2ac761d548981c5ac3b041c4fbbd8e95353690eba141
4. 0x970cf292274d08a74738b6292bdd240d5255a74929d92800be1fbd58f2952d0a
5. 0x2cab712c3ac3f55e824d197853b90bc45cff50783855bcaba2de059d26e79b17
6. 0xa4cbb8fef81757b712d61328fa1c1a31f198b2379ca3a045b0cbf206d11392c8
7. 0xe05d94d56a9aa973290546c53705bf456485d21246b4ff83c38930f5954dd41b
8. 0xd3ebd1d8b815373878a1b5c6b5cbfb1c3174c0e40760067d952a58c895895dd0
9. 0x0d4278a1980e5aee9c2de67b0188027de8dafbb766e82274ebc29cd5e43b57f0
10. 0x01329e374a465f6254ae074b3ab3a888ae0012f8c291524f049222391a97344e
11. 0x95fd8dbb624ecc6822c359ba43d046675a49c3d9c33da7908f9d847fea4eb0f8
12. 0x7142f07ffeddbd14ceabecb9ab27a468e9ab58a2fca5472c5c6a93f3e98f173e
13. 0x938752e9acd199cd15f468392bc2dd8eefc52293e7144e30b87b241ca6b2513b
14. 0xcc49fd573532e5a29f5be4033f62a2eff71456c020bd2258312b98e95cfe301e
15. 0x969cd44e5a4e8dc3110540398fbf689659eb51df735c1cda5d8f021ef9ff5683
16. 0xa94627de1af0e823832e05a9069b304ecccb8c0cdb8f9cfc4f2039bfb9799dc5
17. 0xdf1105afdc109de3c09a98fc8a3864159ad964e6f49b635c105a27a1e1f14310
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4