Evidence row 1259550

What was observed

{
  "count": 5,
  "tools": [
    {
      "description": "Roles added or changed since an ISO timestamp — poll this on a schedule (heartbeat) instead of re-fetching the whole feed.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "since": {
            "description": "ISO 8601 timestamp, e.g. 2026-10-29T00:00:00Z",
            "type": "string"
          }
        },
        "required": [
          "since"
        ],
        "type": "object"
      },
      "name": "diff_since"
    },
    {
      "description": "Full detail for one role by id (from search_jobs), including applyUrl, compensation, skills, geography and freshness timestamps.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "id": {
            "description": "Role id, e.g. \"anthropic-abc123\"",
            "type": "string"
          }
        },
        "required": [
          "id"
        ],
        "type": "object"
      },
      "name": "get_job"
    },
    {
      "description": "All tracked organizations with type, mission and current open-role counts.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "list_orgs"
    },
    {
      "description": "Dated aggregate numbers: open roles, organizations, distribution by category/mode/level. Stable facts for citation.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "market_stats"
    },
    {
      "description": "Search open frontier-AI roles. Filters combine (AND). Returns compact records; use get_job for full detail.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "category": {
            "description": "e.g. Engineering, Research, Policy",
            "type": "string"
          },
          "company": {
            "description": "Organization name or id, e.g. \"Anthropic\"",
            "type": "string"
          },
          "country": {
            "description": "Country name, e.g. \"United States\"",
            "type": "string"
          },
          "level": {
            "description": "e.g. Senior, Staff, Entry",
            "type": "string"
          },
          "limit": {
            "description": "Results per page (default 25)",
            "maximum": 100,
            "minimum": 1,
            "type": "integer"
          },
          "mode": {
            "description": "Remote, Hybrid or On-site",
            "type": "string"
          },
          "offset": {
            "description": "Pagination offset",
            "maximum": 9007199254740991,
            "minimum": 0,
            "type": "integer"
          },
          "query": {
            "description": "Keyword across title, summary, category, skills",
            "type": "string"
          },
          "remoteOnly": {
            "description": "Remote roles only",
            "type": "boolean"
          }
        },
        "type": "object"
      },
      "name": "search_jobs"
    }
  ]
}

What the leaf hashes

{"body":"6352de2ae5a5cbe41ecfd0926fc6e2fc33a69d7d3ab5d60520cef693273ca027","id":1259550,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793385377944803,"prev":null,"subject":"5effcfea-1a70-4bb6-b03c-6d7e24301357","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-30 (243099 rows).

1. 0xe4203d4cfb4e771c8747ae7845cb8c661459fe176ee8c2aaa473a3e8f3baad7a
2. 0xdf2ab504a3a9ea5f2aa136f908b7b0c78741165b593b142c631f28e22c4e05b7
3. 0x59cd5d34262ee0067f1b09e3400dd2d563c5a17231a5ea321b78da4d1eeaed72
4. 0x487f3f142defaa46f9dbb4c0eb6bf07459668f087d4b352e82c5b1e50378a397
5. 0xa930e428c8a0d3146c62d6085025103195dbdb57002b86bd4e26978279a28be3
6. 0x412bdfa8da085b3621330adfd2c0da4f60801b77ed90ae61efad17cfa46426ef
7. 0x0c6a6362e19787c38b77d0a26cef67e1a1de85b1bdd1ae4b564f90a8503c02ca
8. 0x81c402367a4afaad8194f0feb56d8db8457bf8fb76dc5a93d53ae82a32f74b09
9. 0x3699c3312eff3b90c039b9436c3bd5853596e2c62a0f444f6c59ebf5cabbc423
10. 0xb4e81975c4d811ec06004d50db03443db8742078ee52f31b509c07a120c568bf
11. 0x78350f81e25168b675146fea0ea7dd034f4994e12d8e196862e7092f13ec0a93
12. 0x29d78c08f0f7705f8a1cebe8b65a9bc2be71cf8d471fab735b33a8720bcdf0cb
13. 0xc1648b63331523f1ffba0502dc2754123aa7191c2d0b487849b227a545fbee34
14. 0x3a7a0fa82cbf8d3f1546fc6f89c9a5f35e025db7170b70e3f2dcd72b4ebb0f8e
15. 0xea7df1002501052c124b5aed2b1a5df3d59be54394c6a8539c86fad1df339a9e
16. 0xfbe61dc2d59668ac573e5eab865747e21d38bf2fe4c64762beef01f1018a4dea
17. 0x71e74c274b23c9047354edb6dcd2c654415e3986b8bd875dae992996ea12e22b
18. 0x0c43c73b62a5d49ee1444b5dc4195fc5b16b141d3f4458e2e9fbd5fd6ecb367d

Day root

0x0826c7ad6039e06a2360ca0a4a3a4fe7f2626c6dc19f71a37599386f78b39875

Chained

0x36b4c8a1063758f0b8765fa1bdf75fa92fb543cc183add3e261880ee2bd1f822

Published

On Arc Testnet, block 69923247: 0x8704744146c6967c8abc9e9a99de4db7283b29e840922ea83a69b6fe776e6861