Evidence row 303280

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Create a Stripe Checkout payment link for a fax. Returns payment_url — give this link to the human so they can pay in their browser (agents never handle card details) — and payment_id, which you pass to send_fax after the human has paid. The price is computed server-side from the document or text. The Checkout link expires (see expires_at, ~24h); create a fresh one if the human delays.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "cover_text": {
            "description": "Plain text to fax instead of a document.",
            "maxLength": 50000,
            "type": "string"
          },
          "document_url": {
            "description": "Public http(s) URL of the PDF to fax (same one you will pass to send_fax).",
            "format": "uri",
            "type": "string"
          },
          "pages": {
            "description": "Page count, if pricing without the document. send_fax re-verifies against the real content.",
            "maximum": 500,
            "minimum": 1,
            "type": "integer"
          },
          "to": {
            "description": "Recipient fax number in international format, e.g. +15551234567.",
            "type": "string"
          }
        },
        "required": [
          "to"
        ],
        "type": "object"
      },
      "name": "create_fax_payment"
    },
    {
      "description": "Get the exact price to send a real fax to any US, Canadian, or international fax number via faxer.me. Call this first whenever a user wants to send, transmit, or fax a document or message. Provide document_url (a publicly downloadable PDF), cover_text (plain text that will be rendered onto fax pages), or pages (an estimated page count). Pricing is pay-per-fax ($1.00 first page + $0.25/page, returned in USD cents); no account or API key needed.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "cover_text": {
            "description": "Plain text to fax instead of a document (rendered as PDF pages, ~3000 chars/page).",
            "maxLength": 50000,
            "type": "string"
          },
          "document_url": {
            "description": "Public http(s) URL of the PDF to fax. The server downloads it and counts real pages.",
            "format": "uri",
            "type": "string"
          },
          "pages": {
            "description": "Estimated page count, if you only need a rough quote.",
            "maximum": 500,
            "minimum": 1,
            "type": "integer"
          }
        },
        "type": "object"
      },
      "name": "get_fax_quote"
    },
    {
      "description": "Check the delivery status of a fax sent with send_fax. Status 'success' means the receiving fax machine confirmed the transmission; 'inprogress'/'queued' mean it is still sending; 'failure' means it could not be delivered. Delivery typically takes 1-5 minutes; poll roughly every 30 seconds.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "fax_id": {
            "description": "The fax_id returned by send_fax.",
            "type": "string"
          }
        },
        "required": [
          "fax_id"
        ],
        "type": "object"
      },
      "name": "get_fax_status"
    },
    {
      "description": "Transmit a fax. Two ways to pay: (1) human-in-the-loop — pass the payment_id from create_fax_payment after the human has paid the Stripe Checkout link; (2) autonomous machine payment (x402/MPP) — call WITHOUT payment_id and the server replies with a payment challenge (JSON-RPC error -32042) for USDC-on-Tempo or a Stripe Shared Payment Token; pay it and retry with the credential in _meta['org.paymentauth/credential']. Either way the server verifies the payment covers the server-computed price of the actual content before sending via a real fax carrier. One fax per payment; card/Checkout and Stripe machine payments are refunded automatically if the fax fails to send or deliver (on-chain payments are refunded manually).",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "cover_subject": {
            "description": "Optional heading for a cover_text fax.",
            "maxLength": 200,
            "type": "string"
          },
          "cover_text": {
            "description": "Plain text to fax instead of a document.",
            "maxLength": 50000,
            "type": "string"
          },
          "document_url": {
            "description": "Public http(s) URL of the PDF to fax.",
            "format": "uri",
            "type": "string"
          },
          "payment_id": {
            "description": "The payment_id from create_fax_payment (Stripe Checkout Session id). Omit to pay autonomously via an x402/MPP machine-payment challenge instead.",
            "type": "string"
          },
          "to": {
            "description": "Recipient fax number in international format, e.g. +15551234567.",
            "type": "string"
          }
        },
        "required": [
          "to"
        ],
        "type": "object"
      },
      "name": "send_fax"
    }
  ]
}

What the leaf hashes

{"body":"9991cbe440bcf26903e59f2300a1344b75f8b97d97b3fbe6b6c2df37bdcfe6be","id":303280,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793055258703697,"prev":null,"subject":"c9b77240-033b-4c3e-b97d-3d607301290a","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. 0x353583f779cda0eb6ee684c9894189d1f96e35e68758d341774278b60fbb2278
2. 0xcb83177abc46c8c6115689598cab3ae18c875053029c63aba2e5a1cef1656b08
3. 0x3627505ad2937fda9dc4574d17afc42c3e9d056620cc4f2197cf95ad33a289f0
4. 0x013d199c8d3dc6ac87148e21db98e604c49bd1900c5551ab6ab3efa2e4ddc2b6
5. 0x1574e3cd2012730d0d5946f80a7b79f923c8d9ef1caaf3b7d4c02004b3113707
6. 0x0619b395701a369a0e7917105ad458ae50a803048601e11131aed9cab75f87be
7. 0xfe7ea92421c683e42226293cb8cc2110e4de0b30a915924c5f94e6e01ddb2e22
8. 0xdb66782fd9b82cc1b6c1376cb594d3bef3851270bd6daba4f7d18f21e1dfc5ed
9. 0xfb1089ccd2c2414c0ea65d29400fbe3cb672be3d5cf77c4be9b86547eb864c9f
10. 0x36bec804120016062991795b06589946d6f9108ba9f84ace37bda5ef8cca7e6d
11. 0x30ae64b0356d2a2933965306373f46f4bf64268b5a265594ef3370f079c19d92
12. 0x992ab7416b80cd368936c788f743fd3ea4576a49e22c75ab0262abf692f8ed6c
13. 0xdfc7a920beab71e6882e75c57bf136a5354c4ea989a35108a69046bc62059090
14. 0x4338355a835617a26aa0bfcc971e84eb030d84e2aa840e3c8af958921dd080c7
15. 0x610738e0c43687aded83c613c73de8b5226c73c375858a167436461c522ea213
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae