Evidence row 516187

What was observed

{
  "count": 10,
  "tools": [
    {
      "description": "One contract or award record from the register.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "id": {
            "description": "Record id as given by assay_search (the part after the country in the endpoint).",
            "type": "string"
          }
        },
        "required": [
          "country",
          "id"
        ],
        "type": "object"
      },
      "name": "assay_contract"
    },
    {
      "description": "Countries covered by the Assay Systems procurement register, with the number of suppliers indexed in each.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "required": [],
        "type": "object"
      },
      "name": "assay_countries"
    },
    {
      "description": "Contracts of one line that are still running, soonest end first: the next tenders to come. Needs an Enterprise Data key: X-API-Key header on the MCP request (https://assay-systems.com/api-key/#data).",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "before": {
            "description": "YYYY-MM-DD: only contracts ending before this day.",
            "type": "string"
          },
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "line": {
            "description": "Line id from assay_line or assay_search.",
            "type": "string"
          },
          "page": {
            "description": "Page of the result list (default 1).",
            "minimum": 1,
            "type": "integer"
          }
        },
        "required": [
          "country",
          "line"
        ],
        "type": "object"
      },
      "name": "assay_ending"
    },
    {
      "description": "A line of business (what is bought) in one country: buyers, suppliers and totals.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "id": {
            "description": "Record id as given by assay_search (the part after the country in the endpoint).",
            "type": "string"
          }
        },
        "required": [
          "country",
          "id"
        ],
        "type": "object"
      },
      "name": "assay_line"
    },
    {
      "description": "All contract rows of one line of business with the buying office's contact, end dates and amounts. Needs an Enterprise Data key: X-API-Key header on the MCP request (https://assay-systems.com/api-key/#data).",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "buyer": {
            "description": "Words of the buyer's name.",
            "type": "string"
          },
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "ends_before": {
            "description": "YYYY-MM-DD: only contracts ending before this day.",
            "type": "string"
          },
          "id": {
            "description": "Record id as given by assay_search (the part after the country in the endpoint).",
            "type": "string"
          },
          "page": {
            "description": "Page of the result list (default 1).",
            "minimum": 1,
            "type": "integer"
          }
        },
        "required": [
          "country",
          "id"
        ],
        "type": "object"
      },
      "name": "assay_line_contracts"
    },
    {
      "description": "Search the register for a supplier (firm) by name or line of business. Returns names, countries, ids and endpoints.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "limit": {
            "maximum": 200,
            "minimum": 1,
            "type": "integer"
          },
          "q": {
            "description": "Name or words, two letters or more.",
            "type": "string"
          }
        },
        "required": [
          "q"
        ],
        "type": "object"
      },
      "name": "assay_search"
    },
    {
      "description": "Buyer × supplier pairs where the supplier won without a rival, locks and buyer shares; without country — the list of countries. Needs an Enterprise Data key: X-API-Key header on the MCP request (https://assay-systems.com/api-key/#data).",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "buyer": {
            "description": "Words of the buyer's name.",
            "type": "string"
          },
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "kind": {
            "enum": [
              "pairs",
              "locks",
              "buyers"
            ],
            "type": "string"
          },
          "page": {
            "description": "Page of the result list (default 1).",
            "minimum": 1,
            "type": "integer"
          },
          "supplier": {
            "description": "Words of the supplier's name.",
            "type": "string"
          }
        },
        "required": [],
        "type": "object"
      },
      "name": "assay_solo"
    },
    {
      "description": "When each source of the register was last read and built.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "required": [],
        "type": "object"
      },
      "name": "assay_status"
    },
    {
      "description": "One supplier's record: contracts won, buyers, totals, exclusions and grants, with the source and licence.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "id": {
            "description": "Record id as given by assay_search (the part after the country in the endpoint).",
            "type": "string"
          }
        },
        "required": [
          "country",
          "id"
        ],
        "type": "object"
      },
      "name": "assay_supplier"
    },
    {
      "description": "All contract rows of one supplier with the buying office's contact, end dates and amounts. Needs an Enterprise Data key: X-API-Key header on the MCP request (https://assay-systems.com/api-key/#data).",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "buyer": {
            "description": "Words of the buyer's name.",
            "type": "string"
          },
          "country": {
            "description": "Two-letter country code in lower case, e.g. ca, us, gb, ua. assay_countries lists them.",
            "type": "string"
          },
          "ends_before": {
            "description": "YYYY-MM-DD: only contracts ending before this day.",
            "type": "string"
          },
          "id": {
            "description": "Record id as given by assay_search (the part after the country in the endpoint).",
            "type": "string"
          },
          "page": {
            "description": "Page of the result list (default 1).",
            "minimum": 1,
            "type": "integer"
          }
        },
        "required": [
          "country",
          "id"
        ],
        "type": "object"
      },
      "name": "assay_supplier_contracts"
    }
  ]
}

What the leaf hashes

{"body":"62412e07136324f0a01830ab17db95f1230d3e85577662367d46a539fc18aca8","id":516187,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793120484054467,"prev":null,"subject":"ba4142ec-3f84-4dae-b6bb-291e862e41f8","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. 0x9490d9eccb8653edfe944fbad69304a323d3fa8ebd57cabb3a47ee4bddc6e381
2. 0x1cd9bedcd6680367a6c50a2131f222fed83b7cd59bebaa4f09225c4625c65862
3. 0xb89daaccd52644b6281429b6d7403251d7cea55713ddfe1cdbe16a331c0014de
4. 0xf4ecb57a806e70c1ead2edad3baa3f766464f87bd1da487913555b4fc440877b
5. 0x631bb92a525d3bfd9a4895f77ca53047b0467c06c4fa834f92b4359b2b86d6f6
6. 0x05792b62a23ee04bc3a4e531ac728316b1655ce62a332b9f80b576930163d445
7. 0xf05011f9301807f11c7a1af1e4a2155ec4d3fd3e83626c4a43c3b46ed9f9c2ef
8. 0xd20babdc0a8a8d804c49ab50a464cbff7e639437f86688bd4a8d0834dbf7b15c
9. 0xceab05f2688710088425bdb6b6f47320907e7cd3aef2423d1c2b180e5fb0c805
10. 0x88feef9b2933522158e98d853eaf22bd6bb0c0e8aba56b399d7b5895627cadd2
11. 0x04a09d663456ff3951851256dd93fd8bffe97c065373b0fa7994aee5fd52c4a7
12. 0x747fb8d60cfe8dde3cb6d73475c58c3912bdf8d928b8f0480aa1c97a1b71d408
13. 0x59c5c792b40d9054ce2b84a60af97fa54f2e1a2a369a6a52dc3f45de41128e97
14. 0xa3c9c760ee424c178bab782711c2b9d3e15a80a6fde99165972cb75b306bb8b4
15. 0xb4f7223140c8a36cb87a63d77cf617086d9968dc4658f03e102571ebe06e9ed6
16. 0xfecf3d4646dd4984a13dd715499e842c3fde63692336d97394c2bfd8e877ca5d
17. 0xf30fddbf4811226c58e8f0daf36fddd79fc5f1356b592bb1d99a8061ddbabe66
18. 0x2bf8151e5f157dd183b9de6fa00469551932a7a6e3f33a694895000ac9061197
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4