Evidence row 75050

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://factstamp.agentrails.workers.dev/watch"
    ]
  ],
  "name": "factstamp.agentrails.workers.dev/watch",
  "owner_address": "0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32",
  "raw": {
    "accepts": [
      {
        "amount": "500000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "description": "Buy a standing re-check of one citation or one package version, when an answer has to stay true rather than be true once: re-checked every day for 30 days. US$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. Pay per call here, or redeem a prepaid pack code (10 credits). Returns a read URL and a token shown once.",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxAmountRequired": "500000",
        "maxTimeoutSeconds": 300,
        "mimeType": "application/json",
        "network": "eip155:8453",
        "payTo": "0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32",
        "resource": "https://factstamp.agentrails.workers.dev/watch",
        "scheme": "exact"
      }
    ],
    "description": "Buy a standing re-check of one citation or one package version, when an answer has to stay true rather than be true once: re-checked every day for 30 days. US$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. Pay per call here, or redeem a prepaid pack code (10 credits). Returns a read URL and a token shown once.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "kind": "citation",
              "subject": "10.1038/nature12373",
              "webhook": "https://example.com/factstamp/hook"
            },
            "bodyType": "application/json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "expires_at": "2026-11-05T06:30:00.000Z",
              "kind": "citation",
              "next_check_at": "2026-10-07T06:30:00.000Z",
              "paid_with": {
                "list_price_usd": 0.5,
                "rail": "x402_pay_per_call",
                "settlement": {
                  "success": true
                }
              },
              "read_url": "https://factstamp.agentrails.workers.dev/watch/9f2c1ab4d0e57718",
              "receipt_url": "https://factstamp.agentrails.workers.dev/r/8bd1f0a4c9e27715",
              "seeded_verdict": "verified",
              "subject": "10.1038/nature12373",
              "token": "fw_9d1c… (shown once)",
              "watch_id": "9f2c1ab4d0e57718"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "additionalProperties": false,
          "properties": {
            "input": {
              "additionalProperties": true,
              "properties": {
                "body": {
                  "type": "object"
                },
                "bodyType": {
                  "const": "application/json"
                },
                "method": {
                  "const": "POST"
                },
                "type": {
                  "const": "http"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "additionalProperties": true,
              "properties": {
                "example": {
                  "type": "object"
                },
                "type": {
                  "const": "json"
                }
              },
              "required": [
                "type",
                "example"
              ],
              "type": "object"
            }
          },
          "required": [
            "input",
            "output"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-05T21:24:35.386Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-05T21:24:35.231Z"
    },
    "resource": "https://factstamp.agentrails.workers.dev/watch",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Buy a standing re-check of one citation or one package version, when an answer has to stay true rather than be true once: re-checked every day for 30 days. US$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. Pay per call here, or redeem a prepaid pack code (10 credits). Returns a read URL and a token shown once."
}

What the leaf hashes

{"body":"354bcd45d331deb6bae668820cff32d1a810c54e0944444c4358501a58175367","id":75050,"kind":"listing","method":"baseline/1","observed_us":1793025489990698,"prev":null,"subject":"x402_bazaar:https://factstamp.agentrails.workers.dev/watch","subject_kind":"source_record"}

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. 0x24b504dab14862bf4a04d09219816c71ce1466de4060a4a93b999cf8d1e13de3
2. 0x9afec77ec9dc249aea05351a8a7d49dfa98683d82f64651a432cc20779931728
3. 0xf2ac06515d4be8e4ba00ba9a88a467cf7d299a8def6518296ebda510cf41bd4e
4. 0xb3be0adb461594f1e5a591dea3023eb3a0a4f6a333086f847c01c542cdc98a25
5. 0xbab42f4f5e0d19e88efa53fbd8d0eaab2e8a09effe691336bd33ad01b3a3ba23
6. 0x1761a5e19e8f03181927897f3588504bb0be45fdb991a4c93ab37e910423ce2c
7. 0x4a77b5f3c2c2b7bc940d4a136e1e7e5e0314917b83038fcacfdb8d6a64f29a11
8. 0x54d651d7e645c7e112b7f41c268916c9bfb9bce735f7b499cfde0a8afdf20378
9. 0xc2c0139377d9d280ab951f4619a24fe372b3e8bea00b0461289356e47d5e6c25
10. 0xfe4ee9a25c2f5ad925133380f1786d74cb1b3864d5014888d5e20a14c89ec5b0
11. 0xcd59d6e87f33016070792bd627b1f58155e890e1fdf84deab560cdcb1c986874
12. 0x2ceb9cc3a43f479e6ab73db5d3d474a93995fb4188ee45f71846b4cf537a0016
13. 0x830b2c874449c7499489eba2baa67d49f991298225763c0161b471621038d0fb
14. 0xd843afcced75dedd39194ff9bd12326b88099e6112686db2299392d022dc3146
15. 0xc3a6a3ae44ec0da1848b16d40c45d7aac97a67352eea8df18e0f26edabea8a2f
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae