Evidence row 784765

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://canary.countersignpay.com/v1/base/head"
    ]
  ],
  "name": "canary.countersignpay.com/v1/base/head",
  "owner_address": "0xa0f3c29f25778ddf46fce2cab5f7e7c25e6a1451",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xa0f3c29f25778dDf46fce2cAB5f7e7C25E6a1451",
        "scheme": "exact"
      }
    ],
    "description": "Current Base mainnet block height and base fee per gas in wei, read from the chain at request time",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {},
            "type": "http"
          },
          "output": {
            "example": {
              "baseFeePerGas": "1043211",
              "blockHeight": "35812044",
              "network": "eip155:8453",
              "observedAt": "2026-09-15T14:00:00.000Z"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {},
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "baseFeePerGas": {
                      "description": "Base fee per gas of that block, in wei, decimal string",
                      "type": "string"
                    },
                    "blockHeight": {
                      "description": "Latest block number on Base mainnet, decimal string",
                      "type": "string"
                    },
                    "network": {
                      "description": "CAIP-2 chain id, always eip155:8453",
                      "type": "string"
                    },
                    "observedAt": {
                      "description": "ISO 8601 time the chain was read",
                      "type": "string"
                    }
                  },
                  "required": [
                    "blockHeight",
                    "baseFeePerGas",
                    "network",
                    "observedAt"
                  ],
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-28T03:51:10.426Z",
    "quality": {
      "l30DaysTotalCalls": 13,
      "l30DaysUniquePayers": 8,
      "lastCalledAt": "2026-10-28T03:51:10.14Z"
    },
    "resource": "https://canary.countersignpay.com/v1/base/head",
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Current Base mainnet block height and base fee per gas in wei, read from the chain at request time"
}

What the leaf hashes

{"body":"e8a17bc8dda08fa48866f615005768719a7462ebe5b13d82f108ff79cd068754","id":784765,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793211177676991,"prev":750216,"subject":"x402_bazaar:https://canary.countersignpay.com/v1/base/head","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-28 (231336 rows).

1. 0x7b9767de625b6ea991fe66e3fb4b7c2c3573891010aaae8f186b715c8bb57eff
2. 0x6629269e6e195d0f261bc4928c9eac6fa3e32d8401ca3113662926ebb7067356
3. 0xaecaf862b229c9f0f934a10c59e3cdaf44f71300e71401e369ec4091bda79496
4. 0xdb8c1c46b95e008f4a8664f06c53b49e636169f79a9d7767f092688af94a1ede
5. 0x85d05621845129a5223def81d8833f75a1040d057e594aa50827c0cf5522aa91
6. 0x272040f22af641056dc15e71618dcaaa0f89937c7b6b12d8d6f9e98d3d583e8c
7. 0xdbc1db6c9fe1f29aff25c67021ea6862d6f9e181a05567e36a191c74042b686f
8. 0xdc9003a11dfe3f6561bdaf7432f8159fb41f55874a49a6d3433ebfcec1cb3204
9. 0xa99f2886b2f6590a2008fd0be3497cf44c91239aa9e1bcbc793f15bd58febc90
10. 0x774de4b1a2bbe1aba105d82dd0d0ccf5decda0cf32ada8728361e10dc3c1c492
11. 0xe82f96d033d00bfaf46487d36fdeb534f04428ccd81243d82c67fc031c415cbd
12. 0xbe3c902baf7f3f5315c137ef4046adecc62fc5f9e5449c84bbe7d9fd7b3db570
13. 0xf042be8757f2f3ef070e717e38a7b0ad951d74298e721ac0b2e7855db790e392
14. 0x40581185279a8bf075dca3a4c3a5648ec6f62098ba7402cbc097d5cc707e0840
15. 0xab4e84d781dccd579dcf5c47a356a4a2e6cac58a2aefdf3543a3fa15238fa4db
16. 0x74cf00e07b52415c2184cf20be69d195ed2725497a6892c2f3e449497c17d0ec
17. 0x7a743a0a09057bae687051274e1d45bf973bd36a1a4ba16a191b5d29e3bdfa2a
18. 0xe027395fafb7fc41921c42ca0542524ea22204cbd5908b70b27f3d5fb26f5d0f

Day root

0x2c19037464cc4c493624565f01775d6446fc78eaa118fc6865bfe2bfca9ff78e

Chained

0xd1d7dee8322ceff8f4c8d83aa1fe4a4466825c2af1c97dbde3d35db61234f7be

Published

On Arc Testnet, block 69584042: 0x8bae2b1d097834c8b458513862d70d29ee807e98dc2e863b27250131c15b35ae