Evidence row 306956

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Upload a file (≤ 5 MB; png, jpeg, webp, gif, pdf, json, txt, md or csv) and get a stable public URL https://qrcode.pub/f/<id> that any agent, tool or browser can fetch for 30 days. Nothing executable is accepted. The answer includes a delete token. Price: $0.01 USDC per call via x402 (USDC on Base or Solana, no account; nothing is charged for a bad input).",
      "inputSchema": {
        "properties": {
          "content": {
            "description": "The file: plain text, or base64 when encoding is \"base64\" (binary types must be base64)",
            "type": "string"
          },
          "content_type": {
            "description": "MIME type of the file",
            "enum": [
              "image/png",
              "image/jpeg",
              "image/webp",
              "image/gif",
              "application/pdf",
              "application/json",
              "text/plain",
              "text/markdown",
              "text/csv"
            ],
            "type": "string"
          },
          "encoding": {
            "description": "How `content` is encoded (default text)",
            "enum": [
              "text",
              "base64"
            ],
            "type": "string"
          },
          "name": {
            "description": "Optional file name (letters, digits, . - _; max 80 chars)",
            "type": "string"
          },
          "payment": {
            "description": "x402 payment: the base64 PAYMENT-SIGNATURE value (x402 v2 payment payload signed for one entry of the `accepts` list returned when this tool is called without it). Omit to get the price and payment requirements.",
            "type": "string"
          }
        },
        "required": [
          "content",
          "content_type"
        ],
        "type": "object"
      },
      "name": "host_file"
    },
    {
      "description": "Fetch a public web page and return its metadata: title, description, canonical URL, language, OpenGraph and Twitter card tags, icons and parsed JSON-LD blocks. Price: $0.005 USDC per call via x402 (USDC on Base or Solana, no account; nothing is charged for a bad input).",
      "inputSchema": {
        "properties": {
          "payment": {
            "description": "x402 payment: the base64 PAYMENT-SIGNATURE value (x402 v2 payment payload signed for one entry of the `accepts` list returned when this tool is called without it). Omit to get the price and payment requirements.",
            "type": "string"
          },
          "url": {
            "description": "Public http(s) page to fetch",
            "format": "uri",
            "type": "string"
          }
        },
        "required": [
          "url"
        ],
        "type": "object"
      },
      "name": "page_metadata"
    },
    {
      "description": "Fetch a public web page and return its title, description, clean Markdown (scripts, styles, nav chrome removed) and the list of links. No model call, deterministic. Price: $0.01 USDC per call via x402 (USDC on Base or Solana, no account; nothing is charged for a bad input).",
      "inputSchema": {
        "properties": {
          "payment": {
            "description": "x402 payment: the base64 PAYMENT-SIGNATURE value (x402 v2 payment payload signed for one entry of the `accepts` list returned when this tool is called without it). Omit to get the price and payment requirements.",
            "type": "string"
          },
          "url": {
            "description": "Public http(s) page to fetch",
            "format": "uri",
            "type": "string"
          }
        },
        "required": [
          "url"
        ],
        "type": "object"
      },
      "name": "page_to_markdown"
    },
    {
      "description": "Generate a QR code image (PNG or SVG) for any text or link. Free, no account. The answer carries the image and a permanent image URL you can embed or print.",
      "inputSchema": {
        "properties": {
          "bgcolor": {
            "description": "Background hex, e.g. ffffff",
            "type": "string"
          },
          "color": {
            "description": "Foreground hex, e.g. 1a237e (default 000000)",
            "type": "string"
          },
          "data": {
            "description": "Text or URL to encode (max 2000 chars)",
            "type": "string"
          },
          "ecc": {
            "description": "Error correction (default M)",
            "enum": [
              "L",
              "M",
              "Q",
              "H"
            ],
            "type": "string"
          },
          "format": {
            "description": "Image format (default png)",
            "enum": [
              "png",
              "svg"
            ],
            "type": "string"
          },
          "margin": {
            "description": "Quiet zone in modules (default 4)",
            "maximum": 20,
            "minimum": 0,
            "type": "integer"
          },
          "size": {
            "description": "Pixels (default 300)",
            "maximum": 2000,
            "minimum": 32,
            "type": "integer"
          }
        },
        "required": [
          "data"
        ],
        "type": "object"
      },
      "name": "qr_code"
    }
  ]
}

What the leaf hashes

{"body":"19406a145a69dfbf51b9391beb89939ebdba196dbfdbe234489baff9595e9a45","id":306956,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793057373790080,"prev":null,"subject":"9a556d4e-4d1a-404a-b841-6ad9a8d40560","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. 0x906e8e7eb1d80d9bf2c500090469bbf206b6423875c95dd3f01d6efa209f0778
2. 0xa30fb627108f1f9d286edf87277857baf615140430807a78645e43699c3e4ec1
3. 0x793fdb549c0ec000cd2dc54599e4ab478844f1122c36c2939e750d9ade3a13ba
4. 0x5df84b4d85b427a6db3b10741606289c8e78e427d055bb7459bbd026f259fa13
5. 0xbd488fb000226cbbe8112c7f033343219d7c4dcb4ad0b246d35ea45d305fc419
6. 0x141055f102574f4e8d05b9b15e5567162207c7cea877c7b317d99154edfeccaf
7. 0xd8c0423062cc2da8fe9332e13ad9a8d88b21bca793ce107f1d39551c889db298
8. 0x41ce94c4a549a2d7da77f3f5d89096b2d8c5617ffd48f52ce35cca832f022f2e
9. 0x957ebc7023975d8dcec4401284c254f8b3fe230b729fef0aaf533a85e7cfd531
10. 0xaceb83c372739bd98e77173713a458afd2092803e86ac0b8b2afe3eb94ca90c0
11. 0xc41c5ee73cf254bf3fe8e9a8475b0931c3223f7331f30010bc3a5e2a753329d6
12. 0x4634efb8094d1dd2874013b832ad8653e49400f57bf98efdcc5f925ed08d0f5b
13. 0xc0cb184c9bdf71abcf18fda97bd59289153d120dbf8fee9f517b63bf303deb95
14. 0xf0edabbb9ba0d643e5505d19d07637eb6f6aed0a1c7356af43ae7d84ae9ef0c5
15. 0xf0bd63870f0bb378fa300bd33563050dcb7b3e02b44eb3ee550c1c534ec4b246
16. 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae