Evidence row 574554

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Check that the Agent Evidence API MCP server is reachable and report which service version is running. Free to call, takes no arguments or payment. Returns only {status, service, version} and exposes no secrets or infrastructure detail.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "health"
    },
    {
      "description": "Free preview of the paid tool: give one question and one public URL and get back up to three cited excerpts with the source URL, retrieval time and content hash. No assessment and no verdict - that is what research_evidence adds, over up to five sources. Capped per day. Use this to judge whether the paid call is worth 0.01 USDC.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "additionalProperties": false,
        "properties": {
          "question": {
            "description": "The question or claim to gather web evidence for.",
            "maxLength": 2000,
            "minLength": 8,
            "type": "string"
          },
          "url": {
            "description": "One public source URL to retrieve and cite. The paid tool accepts up to five.",
            "format": "uri",
            "type": "string"
          }
        },
        "required": [
          "question",
          "url"
        ],
        "type": "object"
      },
      "name": "preview_evidence"
    },
    {
      "description": "Fetch public web sources and return structured, cited web evidence for a question or claim. Use this for source verification, claim verification, evidence extraction, and source-grounded research, or to compare sources. Returns source URLs, retrieval timestamps, short evidence excerpts, publisher and document metadata, and an explicit supported/contradicted/mixed/inconclusive assessment. Fresh web evidence is retrieved per request unless served from a bounded cache, and each source reports its actual retrieval time. Every excerpt returned is cited evidence tied to its source URL. No API key and no account: discovery is free, a call costs $0.01 in USDC on Base via x402, and nothing is charged when no source is retrieved.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "additionalProperties": false,
        "properties": {
          "language": {
            "description": "Preferred evidence language: \"auto\" or a BCP-47 tag such as \"en\".",
            "maxLength": 35,
            "minLength": 1,
            "type": "string"
          },
          "max_sources": {
            "description": "Cap on the number of sources processed.",
            "exclusiveMinimum": 0,
            "maximum": 25,
            "type": "integer"
          },
          "mode": {
            "description": "Reserved input. Only \"evidence\" is supported in version 0.1.0.",
            "enum": [
              "evidence"
            ],
            "type": "string"
          },
          "question": {
            "description": "The question or claim to gather web evidence for.",
            "maxLength": 2000,
            "minLength": 1,
            "type": "string"
          },
          "urls": {
            "description": "Candidate public source URLs to retrieve and cite. Version 0.1.0 requires at least one such URL.",
            "items": {
              "type": "string"
            },
            "maxItems": 25,
            "type": "array"
          }
        },
        "required": [
          "question"
        ],
        "type": "object"
      },
      "name": "research_evidence"
    },
    {
      "description": "Return one real, previously produced evidence package, free, so you can see exactly what a paid call returns before spending anything: a verdict, and for every source the URL, retrieval time, content hash and the cited excerpts. Takes no arguments and always returns the same package. The paid tool is research_evidence, which answers your own question.",
      "inputSchema": {
        "$schema": "https://json-schema.org/draft/2020-12/schema",
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "sample"
    }
  ]
}

What the leaf hashes

{"body":"d6b9be4ac86e409cee30c00433f1f861c82d7c2a6fafc54fff371a19e4c4be74","id":574554,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793141578531292,"prev":null,"subject":"49313312-d301-4e74-a1f8-cd2dbdbb3be0","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. 0x45e16aece373629e75e8ad509c8f8b4100561d44af597a6926709cc464d32731
2. 0xcd2fc05f781414afbbec10e6a452a98b2377b6618fa153369ecabbe521888491
3. 0x7b6ecf3ca5d18f3a02be394ae640985251f2ac597247e5c774a42ab44560e373
4. 0xfe93d3d7976af98ec0f0bcc112f87c1443cbc64918adde3a4eb0f248ee849325
5. 0x2223401adf621d53586dd70f0e289b048e5c642bf4526dad8c5a712c2735368a
6. 0x90113db0daff5c0daa847f53aa7b6777f3ee09aa9170b8820bb8b9dfbd287c90
7. 0xc6e3411225fb7b1814e40320b7f04d562e8021e5994d16aa1de9e8a5345dc3e8
8. 0x488d07863af22095f5babf26691622ad40c985ed6bdfbc06328e7c38d7fb096f
9. 0x5532a6615f86e719b3179a60b31f64f1a572faa59bbb96b8162c98a5de3cbbcc
10. 0x5bfbe7ccdb4fc096a0e333ae82fe6e5aeba69315084d2a7593944eedb3a5b127
11. 0xb0aa948b8f1ffa99da7b7b4fecd9b7d539930ac590588a6deea36813f55a0423
12. 0x92473b1fa79263164c4ce7d79f93b1dc8a85f63587b51a81433d1ad19b285a90
13. 0x836e1796750a28d286ffaa8d273d250fe348c563336bf2d30cfaf1001d95f677
14. 0x80ede9e5d428e39db26928b1d08254ff1241f1d7e091fd2e57130fbb4423162b
15. 0x2c117b27721eea45f6590fbccb471d21a7b0b079a53f089ecb300c63bdb3aebf
16. 0x3ed50f053eca72dfd3a9d45a11935240bfe691e57835c367ddebe2cbc49efe9d
17. 0x0e01aa9525097570a6edaf32bfc959de57bf5c24317cf10c0716affea85ca60d
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4