Evidence row 123854

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://verity.basechainlabs.com/api/verify"
    ]
  ],
  "name": "verity.basechainlabs.com/api/verify",
  "owner_address": "0x400d65bb174c546ed92f5d61ce21fbde96b8bacc",
  "raw": {
    "accepts": [
      {
        "amount": "100000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 600,
        "network": "eip155:8453",
        "payTo": "0x400d65bb174c546ed92f5d61ce21fbde96b8bacc",
        "scheme": "exact"
      }
    ],
    "description": "Fact-checking with persistent memory — VERITY remembers prior claims your agent has checked and skips repeat lookups, saving tokens across sessions. Returns CURRENT/OUTDATED/DISPUTED/UNVERIFIABLE verdicts with confidence score, sources, and what changed. 0.10 USDC.",
    "extensions": {
      "bazaar": {
        "iconUrl": "https://verity.basechainlabs.com/verity-logo.jpg",
        "info": {
          "input": {
            "body": {
              "caller_id": "my-agent-id",
              "query": "Verify: Is GPT-4 still the most capable OpenAI model?"
            },
            "bodyType": "json",
            "method": "POST",
            "type": "http"
          },
          "output": {
            "example": {
              "artifact": {
                "index": 0,
                "parts": [
                  {
                    "text": "{\"verdict\":\"OUTDATED\",\"confidence\":91,\"summary\":\"GPT-4 has been superseded by GPT-4o and o3 models as of 2025.\",\"what_changed\":\"OpenAI released GPT-4o in May 2024 and o3 in late 2024, both outperforming GPT-4.\",\"sources\":[{\"url\":\"https://openai.com/blog/...\",\"title\":\"...\",\"published_date\":\"2025-01\",\"supports\":\"CONTRADICTS\"}]}",
                    "type": "text"
                  }
                ]
              },
              "status": "completed"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "body": {
                  "properties": {
                    "caller_id": {
                      "description": "Optional agent or user ID for persistent memory.",
                      "type": "string"
                    },
                    "query": {
                      "description": "The claim, URL, or content to verify. E.g. 'Is OpenAI still valued at $157B?' or 'https://example.com/article'",
                      "type": "string"
                    }
                  },
                  "required": [
                    "query"
                  ]
                },
                "bodyType": {
                  "enum": [
                    "json",
                    "form-data",
                    "text"
                  ],
                  "type": "string"
                },
                "method": {
                  "enum": [
                    "POST",
                    "PUT",
                    "PATCH"
                  ],
                  "type": "string"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "bodyType",
                "body"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "artifact": {
                      "type": "object"
                    },
                    "status": {
                      "type": "string"
                    },
                    "tokens": {
                      "type": "number"
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        },
        "serviceName": "VERITY — Claim Verification",
        "tags": [
          "fact-check",
          "verification",
          "data-freshness",
          "hallucination",
          "ai-verification"
        ]
      }
    },
    "lastUpdated": "2026-10-22T18:52:14.844Z",
    "quality": {
      "l30DaysTotalCalls": 9,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-22T18:52:14.604Z"
    },
    "resource": "https://verity.basechainlabs.com/api/verify",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Fact-checking with persistent memory — VERITY remembers prior claims your agent has checked and skips repeat lookups, saving tokens across sessions. Returns CURRENT/OUTDATED/DISPUTED/UNVERIFIABLE verdicts with confidence score, sources, and what changed. 0.10 USDC."
}

What the leaf hashes

{"body":"03b3295feebe040db2ff96e815e14e7e4725d2b77be61d4ca9dc31f1a2b04c17","id":123854,"kind":"listing","method":"baseline/1","observed_us":1793025623789755,"prev":null,"subject":"x402_bazaar:https://verity.basechainlabs.com/api/verify","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. 0xa0d810537f837bf5a3fc2eb0520180d84924473fc629d8b50cad6e39a21d5ddf
2. 0x1c4d0b1becd816af4dd309630fb4c212c851b7024ca00639817de91c3fe758de
3. 0x9d899a1b8c7a326933db52bf8682a4d964e5a0d527cbb772cb14fda8f04cec8b
4. 0x62fa3890371756573b196038122967728569298d38794796290dd87f9ef7f4a5
5. 0xf5dad7d59dcc00d9c0cfb5985466bea3716836873e158bfe543c2e187a55a885
6. 0xfd72b85094f9d3f588db9383f67595b1c98674c2e40657c1bd7b4ecd6fe781a6
7. 0x78bb66f8a6df4d5cf64a515c7e107f8bfe8cd13dafb9c30ada28df3d9d31c409
8. 0x51df6236b7cdcdae2b83e1f403b6b31ad753cbf16b6b0f07df2d49788fe551d0
9. 0x656efeb7d96e50aeb0381af9e9cce10bc5892a86ec74eee8952a09201c5f9ffd
10. 0x848cf5e604d5f0c62cc02d3abe512164430820fceefd529d003cbca06e431809
11. 0x6e2c6fb1ec16c0d8a0fa917725bdfc512e7ed9f39e77d64f0a911d30e68a27de
12. 0x95576cc3dd18642c859f679cefa1cf80bfc6c690b065916c3585b14e8ef4b1b3
13. 0xf8d3e004d9a208d2c5e82ab676956d80f8a3c78387c61dad15a3a8269efee0d8
14. 0x6713795704ddd9c528d421fadd9cc96b0200a4ddbba84f88e718d4968dde888b
15. 0x62a900133713919f4eed33d8336876b7a6d538233b8a4f3ed03b29aa44f5bad0
16. 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae