Evidence row 72112

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": "2026-10-22T21:30:34.419Z",
    "quality": {
      "l30DaysTotalCalls": 13,
      "l30DaysUniquePayers": 7,
      "lastCalledAt": "2026-10-22T21:30:34.111Z"
    },
    "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":"2118d1711ce90e0b68c2346ae08324af3bb2b3ac13c0f443a5b5ec2ff8c84549","id":72112,"kind":"listing","method":"baseline/1","observed_us":1793025485384711,"prev":null,"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 2026-10-26 (296695 rows).

1. 0x99381ffcf46c4adfbebdbf243fa1ef523ea3ae39351c5b868255b87930bd80f0
2. 0xcddc7655ce05fb9a395b99d287085ff06687a2ccf27ba2a2d2e8f3b810855925
3. 0xf549b81d0b92694f45b7e35e22b2659042af272727c0359a16a76f39edad0fbf
4. 0x27ffc7429f7efebc7e737cdb64714391f7a7a32eb9b47ab1043ad98dae99b849
5. 0x99e1312c7a6d5aa9f033a5550a179b9f09c181b722675daa1e0b0453e99bc289
6. 0x47542b32804d285d18d382e76a57f7f789aec2441be7bfc0a13af9a3906b356f
7. 0x2e5aaa403226482b5b5a5feae0138df30d57626303921e73669e318321b79e87
8. 0xfc55b77c91d8f6d29f395d3a4ebcbae6e4c8c89c37f9687ab2386ef4b5e7531a
9. 0xe5fcc8212245fba4b7457731097c2b4ff118cfd01e0868e3af9c3e2fc6825499
10. 0x2b4f513a842f0518600372c41655e79b425e107967347efd041a1f46774282f2
11. 0xd3f19437d703373e99e0bf69c4ca06561426260f599f7d259e3257085a387573
12. 0x6ae9e6ee1b544d831982666bd3570457659e78fc0064894d7ec23f971a37ff2f
13. 0x239fd39716710e7412bd120c373072b4c0d8b11bb9ee431dad62a2ce57b3d6f4
14. 0x49062da782c4f73855ddd5fdd51840749f928b5f17d1ce75ac50f2d829104e72
15. 0xf0bd63870f0bb378fa300bd33563050dcb7b3e02b44eb3ee550c1c534ec4b246
16. 0x1ac20d30773e1f4f2f811540e9a99b5cca9177c9e2e029acc0d80cf3f1d11f0f
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae