Evidence row 120843

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://saylorinnovations.com/api/water/usgs/:site"
    ]
  ],
  "name": "Saylor Innovations Data Desk",
  "owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
  "raw": {
    "accepts": [
      {
        "amount": "10000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "assetTransferMethod": "eip3009",
          "facilitatorOnly": true,
          "memo": "saylor:datadesk:water-gauge",
          "name": "USD Coin",
          "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
          "version": "2"
        },
        "maxTimeoutSeconds": 120,
        "network": "eip155:8453",
        "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
        "scheme": "exact"
      },
      {
        "amount": "10000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "BFK9TLC3edb13K6v4YyH3DwPb5DSUpkWvb7XnqCL9b4F",
          "memo": "saylor:datadesk:water-gauge",
          "reference": "GhdkqBMMYrMAQQipBhnYwq1v8TiNpJa5cnRD1ALokneJ",
          "session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazp3YXRlci1nYXVnZSIsInJlZmVyZW5jZSI6IkdoZGtxQk1NWXJNQVFRaXBCaG5Zd3ExdjhUaU5wSmE1Y25SRDFBTG9rbmVKIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTIxMTM1NDEzNDZ9.Y45Y2AfdYtWMWj6AAde9E-_538z1cFpdCHONRwQSbSk"
        },
        "maxTimeoutSeconds": 120,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
        "scheme": "exact"
      }
    ],
    "description": "USGS river gauge reading - latest streamflow, gage height and water temperature for a USGS site number with 2-hour change",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "pathParams": {
              "site": "01646500"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "lat": 38.94977778,
              "lon": -77.12763889,
              "name": "POTOMAC RIVER NEAR WASH, DC LITTLE FALLS PUMP STA",
              "readings": {
                "discharge_cfs": {
                  "change_over_window": 0,
                  "observed_at": "2026-10-12T16:50:00.000-04:00",
                  "value": 11500
                },
                "gage_height_ft": {
                  "change_over_window": 0,
                  "observed_at": "2026-10-12T16:50:00.000-04:00",
                  "value": 4.13
                }
              },
              "site": "01646500",
              "source": "USGS National Water Information System",
              "window_note": "change_over_window compares the latest reading to the oldest in the last 2 hours"
            },
            "type": "json"
          }
        },
        "routeTemplate": "/api/water/usgs/:site",
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET",
                    "POST",
                    "PUT",
                    "PATCH",
                    "DELETE",
                    "HEAD"
                  ],
                  "type": "string"
                },
                "pathParams": {
                  "properties": {
                    "site": {
                      "description": "USGS site number in the path, 8-15 digits",
                      "type": "string"
                    }
                  },
                  "required": [
                    "site"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method",
                "pathParams"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "checked_at": {
                      "description": "Time the check was run (UTC)",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "lat": {
                      "description": "Latitude in decimal degrees",
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "lon": {
                      "description": "Longitude in decimal degrees",
                      "type": [
                        "number",
                        "null"
                      ]
                    },
                    "name": {
                      "description": "Name",
                      "type": "string"
                    },
                    "readings": {
                      "type": "object"
                    },
                    "site": {
                      "type": "string"
                    },
                    "source": {
                      "description": "Data source the values come from",
                      "type": [
                        "string",
                        "null"
                      ]
                    },
                    "window_note": {
                      "description": "Window note",
                      "type": [
                        "string",
                        "null"
                      ]
                    }
                  },
                  "required": [
                    "site",
                    "readings"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "json",
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791811517/bazaar-icons/bc5e2b3d111ebbef.jpg",
    "lastUpdated": "2026-10-16T01:17:01.38Z",
    "quality": {
      "l30DaysTotalCalls": 1,
      "l30DaysUniquePayers": 1,
      "lastCalledAt": "2026-10-16T01:17:01.015Z"
    },
    "resource": "https://saylorinnovations.com/api/water/usgs/:site",
    "serviceName": "Saylor Innovations Data Desk",
    "tags": [
      "usgs gauge",
      "streamflow",
      "gage height",
      "river level",
      "water data"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "USGS river gauge reading - latest streamflow, gage height and water temperature for a USGS site number with 2-hour change"
}

What the leaf hashes

{"body":"a2aa885a10a1dc35ad533b0e93d78382c69de42e88c672dcce8f28960de08058","id":120843,"kind":"listing","method":"baseline/1","observed_us":1793025618893098,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/water/usgs/:site","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. 0x08352ca4d164fa12fbfefa350ffffd27243b4756317cfb5f64fa8a9c51979fe5
2. 0x286f1fe1877c5ed8c484a72ec1c4bca7ffb82d6a9023f24b8ed78c40513f8abe
3. 0x6213eb653d00b4d862424fd1a4ac64be95233b703931382b6468e812ebac1ac4
4. 0x5ee333937de19399b569839516618e3d02709bd87fd0e199734223bbdb63db71
5. 0x11df9c80a43ab41009c497491d88fc4cc89d76af98ae9d08a8608625c47cd709
6. 0xbcfba0188dfe4d550225996aa1ba52dd3f0184db832bd262a4d72eb9f8d3c4ca
7. 0xd36fdf454717c0743478bdf980117945a51a363c103c3b89317d27fd52b1b77b
8. 0x960b6af45a51a246581332c253046d53f8e1cf7a3efc1e31d2609de8ac177c8d
9. 0x17487bdd8a24c59ee9743f1f5e4fe998668e6e05e30a4719999b9bec35cb8955
10. 0x8c7a98ae2cb4ce9806641729f82b9b19104c8b000de3727bbd7eb046927d1d21
11. 0x3585060104222ad1aae3396450719e555d4d013fa2b3a7b43777a1722ca9ce22
12. 0x6003e14d04cde1d24b195ac15b568dd483e04047e0f2ff64d9632a51a8f7123d
13. 0xe5a836cf25a8dfc72c9e3b6a69a7561a1f61f50f9cf36707d36f6e926aa15dec
14. 0xa96bb9408ce00a0d40ddaba8736257dfce76d5478b131d69db1afdf8a824312b
15. 0x7ddc2fead128357f881b63e6c7c26d7fbbb84fca6c7c8e0bbfe386de86ca8d39
16. 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae