Evidence row 547786

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://pennydatahq.com/api/fx/:currency"
    ]
  ],
  "name": "ECB Euro Reference Rate",
  "owner_address": "0xd0a3c0f5612ecd88e4b16ef1cd458e1a5e8ffd49",
  "raw": {
    "accepts": [
      {
        "amount": "1000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xd0A3c0f5612EcD88e4b16Ef1cD458e1a5E8FFD49",
        "scheme": "exact"
      }
    ],
    "description": "The latest ECB euro foreign exchange reference rate for a currency (units per 1 euro) and its date, unmodified, as JSON. The same data is available free of charge from the ECB website; reference rates are for information purposes only.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "pathParams": {
              "currency": ":currency"
            },
            "queryParams": {},
            "type": "http"
          },
          "output": {
            "example": {
              "base": "EUR",
              "currency": "USD",
              "currency_name": "US dollar",
              "date": "2026-10-26",
              "notice": "Source: ECB statistics (euro foreign exchange reference rates), unmodified. This data is available free of charge at https://www.ecb.europa.eu. Published by the ECB for information purposes only; not for transaction purposes.",
              "rate": 1.1188
            },
            "type": "json"
          }
        },
        "routeTemplate": "/api/fx/:currency",
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "pathParams": {
                  "properties": {
                    "currency": {
                      "description": "ISO 4217 currency code, any case, for a currency the ECB publishes a reference rate for (about 30, such as USD, GBP, JPY, CHF). Not EUR: every rate is against the euro.",
                      "type": "string"
                    }
                  },
                  "required": [
                    "currency"
                  ],
                  "type": "object"
                },
                "queryParams": {
                  "properties": {},
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "base": {
                      "const": "EUR",
                      "type": "string"
                    },
                    "currency": {
                      "type": "string"
                    },
                    "currency_name": {
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "date": {
                      "description": "YYYY-MM-DD, the reference date",
                      "type": "string"
                    },
                    "notice": {
                      "description": "ECB source and free-availability notice",
                      "type": "string"
                    },
                    "rate": {
                      "description": "Units of the currency per 1 euro, as published by the ECB",
                      "type": "number"
                    }
                  },
                  "required": [
                    "currency",
                    "base",
                    "rate",
                    "date",
                    "notice"
                  ],
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-10-27T14:41:10.357Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-27T14:41:10.085Z"
    },
    "resource": "https://pennydatahq.com/api/fx/:currency",
    "serviceName": "ECB Euro Reference Rate",
    "tags": [
      "fx",
      "exchange-rates",
      "ecb",
      "euro",
      "currency"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "The latest ECB euro foreign exchange reference rate for a currency (units per 1 euro) and its date, unmodified, as JSON. The same data is available free of charge from the ECB website; reference rates are for information purposes only."
}

What the leaf hashes

{"body":"1fae0b039ca4a3657da55e47692717d7d630822f9bcdbadeb00af5735a483844","id":547786,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793133215510205,"prev":null,"subject":"x402_bazaar:https://pennydatahq.com/api/fx/:currency","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0xf89327fd8aac7f8752ff9bd4d6bacaeec6ee7b22c3a1ac16a2713a15255bd38d
2. 0xe148a5be5088d8a8b54ced6a565a19760b9373d9c56f6d08c108929893423992
3. 0x615342d6b82498ea5c91e4cfcf8f476373054e2d371fa7df6c4415df34cef0ff
4. 0x3926a769a8e1888908c3f5f91a8fdfc1f4bfa276fdbaa393c89959fddb843f74
5. 0xb8e4e5bb5d0b476c7f5196120a138433f8a219d24a33d8d9837ed24f22e3e1ec
6. 0x0c147bf3ce638dafc9d86df955bf7d85c5fff6f6d115caf1636095fa528febb2
7. 0x1fcbd2ce0b6407971910c72dbf93ebe1c525b9dc08340845409043a29fcd5910
8. 0xa85908355c25f81b7db592833f59dabe249809dbab0ace1aa45806eb8df0cd27
9. 0x7bdc6728d03a32e736e557a5ee004cf5fb20c4956608d38ca438e03159995b33
10. 0x56dcd9d0921c2081b345026c0b20180a1e39cdbf19a2af10908dfa42d8de7784
11. 0x0910ffa4c5b68bfeab876c95d437a268cbe3ce3065ac289e0ccc44dd931c928a
12. 0x3d6ce9e9447d644baa93c05c5ec0a44778000bfa82e0208f4a0086c782198964
13. 0x2cba9be288dab78cb9c5f54fa13242712b2493da9f833a7c3cdd92cde60662b0
14. 0x94d3785ce9330e4580bccada5459380aa2aac76a0bf11354d1353b375afc17d2
15. 0xb5b652bba4a5afca56c21031d89b1c06361563aaf54ccc8541c296ceeb2b66fa

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4