Evidence row 306420

What was observed

{
  "count": 6,
  "tools": [
    {
      "description": "Describe the Video History Project collection, searchable text, filters, citation practices and response limits. Useful when beginning research.",
      "inputSchema": {
        "properties": {},
        "type": "object"
      },
      "name": "describe_collection"
    },
    {
      "description": "Export citations for 1–25 VHP IDs or URLs. format is text or ris; target is publication (the cataloged work) or page (the VHP web page). Missing publication metadata returns a per-item error; choose page to cite a biography or history page.",
      "inputSchema": {
        "properties": {
          "format": {
            "default": "text",
            "type": "string"
          },
          "ids": {
            "items": {
              "type": "string"
            },
            "type": "array"
          },
          "target": {
            "default": "publication",
            "type": "string"
          }
        },
        "required": [
          "ids"
        ],
        "type": "object"
      },
      "name": "export_citations"
    },
    {
      "description": "Read a public VHP record by ID or VHP URL, resolving old addresses locally. Returns metadata, source links, citations and a section of existing text. Default section is body; choose other section names from sections. Follow content.nextOffset with the same section and version for complete text. Linked scans are not read.",
      "inputSchema": {
        "properties": {
          "id": {
            "type": "string"
          },
          "limit": {
            "default": 12000,
            "type": "integer"
          },
          "offset": {
            "default": 0,
            "type": "integer"
          },
          "section": {
            "default": "body",
            "type": "string"
          },
          "version": {
            "default": null,
            "type": [
              "string",
              "null"
            ]
          }
        },
        "required": [
          "id"
        ],
        "type": "object"
      },
      "name": "get_record"
    },
    {
      "description": "Get the site's existing similarity suggestions for a public record. These are research leads, not evidence of a historical relationship. May return no suggestions when the index has none or the editor has disabled them.",
      "inputSchema": {
        "properties": {
          "id": {
            "type": "string"
          },
          "limit": {
            "default": 6,
            "type": "integer"
          }
        },
        "required": [
          "id"
        ],
        "type": "object"
      },
      "name": "get_related_records"
    },
    {
      "description": "Find catalog author or subject filter keys by part of a name. Returns exact keys, display labels and counts of discoverable records. field is author or subject. Follow nextPage; use a returned key in search_records.",
      "inputSchema": {
        "properties": {
          "field": {
            "type": "string"
          },
          "limit": {
            "default": 25,
            "type": "integer"
          },
          "page": {
            "default": 1,
            "type": "integer"
          },
          "query": {
            "default": "",
            "type": "string"
          }
        },
        "required": [
          "field"
        ],
        "type": "object"
      },
      "name": "list_terms"
    },
    {
      "description": "Search public VHP records by words or quoted phrases. Empty query browses. Combine exact author/subject keys from list_terms, recorded years and a type from describe_collection. Follow nextPage. Excerpts label their source; read get_record before quoting.",
      "inputSchema": {
        "properties": {
          "author": {
            "default": null,
            "type": [
              "string",
              "null"
            ]
          },
          "from": {
            "default": null,
            "type": [
              "integer",
              "null"
            ]
          },
          "limit": {
            "default": 10,
            "type": "integer"
          },
          "page": {
            "default": 1,
            "type": "integer"
          },
          "query": {
            "default": "",
            "type": "string"
          },
          "subject": {
            "default": null,
            "type": [
              "string",
              "null"
            ]
          },
          "to": {
            "default": null,
            "type": [
              "integer",
              "null"
            ]
          },
          "type": {
            "default": null,
            "type": [
              "string",
              "null"
            ]
          }
        },
        "type": "object"
      },
      "name": "search_records"
    }
  ]
}

What the leaf hashes

{"body":"b562fa6b336ca7977525ab7157ff12aa0cec637b9d73b00407ceba0852764e3f","id":306420,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793056977314906,"prev":null,"subject":"bcc904ea-839d-492c-9911-c9dc0ee17752","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0xf484ad97aefc8e0d912d5418a867025b0baf61ac2b6b492aeadcfbac313e2e76
2. 0xe6936d285e4ce5589436f9360cdb0239dfc3bcad3977fb9e07ba9b0e284efbaf
3. 0x151bb784eb10e817bc30925147754f5b198401feb733d8858f691d43498dc353
4. 0x132130fad191fceaa61169771efa4ef3395fa374d5a5c8408f84f350707edcb3
5. 0x4c3a1b930e6e2dcd69f48d0b3c260080503ad71757638987559e63b98a8996a5
6. 0x8b2b11c3ad2bb546af52efdb1d69afcbf4c1ee32fd33097da5bb9a11b0296283
7. 0xfbc9d8737b31add8e47b7d816f6fa5dfb61d9d859f07a957bc402571afea4a6b
8. 0xe8b6a9444dac6af3cec2a46ae693342bb5202258059826eb31f2915f74b8c97c
9. 0xa7b6ff8d81f5ca203875b404feff22c444e9d0e4c09e8d3ae9d234fa3c209aa6
10. 0x83d1e4b5cfd85331032f7b8c5254bddcd842c27f55e4d3baadad57af6db6c793
11. 0x07709318feb0c1102a4f704a544c82a5c58ec388fbdac0965060c1f5091cc976
12. 0x86ae35463d854f3938d986999aa8497e14f0ba2aa6f39a269e1e6d1134f9b847
13. 0x79695e4356ea25a2b58265a824698704cd2c743099ce2dca9e41384ce8f1a8c5
14. 0xd769d41500075835c3b2f9184d223699fb983fd05c29fbcb44d964abc7ee380d
15. 0x68d296b1e00b4899fb83c3fba36fffaefa311eac2903067dbebfe776a12b4a9a
16. 0x5fb5dda563336cd1bc1b9f44c52b76237ae72ed2145cb9290f39f304ca7dd678
17. 0x74a0a08e4e7ab9aa5bfbead33dec7e1c7e8e364cff69a63720d764bbe987aadc

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae