Evidence row 63631

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://agents.factstamp.dev/watch"
    ]
  ],
  "name": "agents.factstamp.dev/watch",
  "owner_address": "0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32",
  "raw": {
    "accepts": [
      {
        "amount": "500000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "description": "A standing re-check of ONE citation or package version, for an answer that must stay true for a month rather than once: daily re-checks 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. One subject only: for a list use /watch/portfolio. Pay per call here, or redeem a pack code (10 credits).",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxAmountRequired": "500000",
        "maxTimeoutSeconds": 300,
        "mimeType": "application/json",
        "network": "eip155:8453",
        "payTo": "0xc3bcd24a2b350cc73b8516b2a0539a323b42cc32",
        "resource": "https://agents.factstamp.dev/watch",
        "scheme": "exact"
      }
    ],
    "description": "A standing re-check of ONE citation or package version, for an answer that must stay true for a month rather than once: daily re-checks for 30 days. US$0.50 the month — 1.7 cents a check, under a 2-cent lookup. The first check is answered and signed on purchase, and each real change (a retraction, a new advisory, a yanked version) gets its own signed receipt. One subject only: for a list use /watch/portfolio. Pay per call here, or redeem a pack code (10 credits).",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "body": {
              "kind": "citation",
              "subject": "10.1038/nature12373",
              "webhook": "https://example.com/factstamp/hook"
            },
            "bodyType": "application/json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "expires_at": "2026-11-05T06:30:00.000Z",
              "kind": "citation",
              "next_check_at": "2026-10-07T06:30:00.000Z",
              "paid_with": {
                "list_price_usd": 0.5,
                "rail": "x402_pay_per_call",
                "settlement": {
                  "success": true
                }
              },
              "read_url": "https://factstamp.agentrails.workers.dev/watch/9f2c1ab4d0e57718",
              "receipt_url": "https://factstamp.agentrails.workers.dev/r/8bd1f0a4c9e27715",
              "seeded_verdict": "verified",
              "subject": "10.1038/nature12373",
              "token": "fw_9d1c… (shown once)",
              "watch_id": "9f2c1ab4d0e57718"
            },
            "type": "json"
          }
        },
        "schema": {
          "$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": "2026-10-20T03:36:43.766Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-20T03:36:43.398Z"
    },
    "resource": "https://agents.factstamp.dev/watch",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "A standing re-check of ONE citation or package version, for an answer that must stay true for a month rather than once: daily re-checks 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. One subject only: for a list use /watch/portfolio. Pay per call here, or redeem a pack code (10 credits)."
}

What the leaf hashes

{"body":"e0c009dd6c5e3e60147c32b96eedcb0703e9ae46d9d6bb2d3b47936d42b598ee","id":63631,"kind":"listing","method":"baseline/1","observed_us":1793025455227709,"prev":null,"subject":"x402_bazaar:https://agents.factstamp.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. 0x0e8e59e560b3a0903089ac3c22135c805068a85098bb7d51289e84f534249448
2. 0x8efb2bba8d031674f6a7fa71a893f197ad21f0f4174c7c314f128ac286138255
3. 0xdaba60dca5fa90bf7b4980321f4653c9407602d04d2f2035fb25e9d7f4c17b44
4. 0x6d401d23132260565196c30e525c34f0b5e55bffa1e4353faac0c898a9fcd715
5. 0x4c2ecd866be900b19294a73e49eb40c50cb1ae808ba15f949c90fc6fad362a13
6. 0x3a6e40ee445e9ad8c4a98faa7c0114e588eb3ea9e57df5ad3ad45a568f0b6a50
7. 0x6c6b2386265951ab39cc3df3b18836207f8963a6eee7955789439d066da111f1
8. 0xd0d64129cd3991df3ff242a9cf1c7cf3397d0dc486857c965b0f78ea40553d66
9. 0x237ff8ead2e807c8c8253ebc3fbd3c0d1d8bc94d78c3e36dfc13945e41878a0f
10. 0x36de94df31980769366d6459ea42b641bdc51120bfd8317d0101e69404feba8e
11. 0x1e6a5f0042a4b7776e54cf79ce729b60eac17c4eb209cc9613fcd31c9fa0d26c
12. 0x129649b2ec48fbc611fb055c3f5627bda42692beb65d09e853d75bcda4e06239
13. 0x294f7935f78a896b5f246a7c9a7ee1b023720acdb03fff3cd549c63479848ec9
14. 0xb49e8c2564256e5322e375cb619d9ac70fd17c1d1eba9c991bba4cb6428f45cc
15. 0x60582ab4b41e72eb70eb0bce07fbf0fb4d2b62a8bad5be50f5d16d511adc746c
16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae