Evidence row 2202262

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://audio-calc.x402tookit.com/db-sum"
    ]
  ],
  "name": "Audio Calc",
  "owner_address": "0xb531320805c5bed1d46aeadcf4f008fdf172dbda",
  "raw": {
    "accepts": [
      {
        "amount": "20000",
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:8453",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
        "extra": {
          "feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
          "transactionVersions": [
            0
          ]
        },
        "maxTimeoutSeconds": 300,
        "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
        "payTo": "DUPiupXtuox38dcGoXUKer5mAydCzmaHjrbQ66qeEm8s",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:137",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      },
      {
        "amount": "20000",
        "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "maxTimeoutSeconds": 300,
        "network": "eip155:42161",
        "payTo": "0xb531320805C5BED1D46AEaDcF4F008FDF172DBDa",
        "scheme": "exact"
      }
    ],
    "description": "Add, average or subtract sound levels in dB: total of several sources, N identical sources, or background-corrected level.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "levels": "60,60,70"
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-11T14:38:34.101Z",
              "averageDb": 66.0206,
              "count": 3,
              "degraded": false,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "increaseDb": 0.791812,
              "levelsDb": [
                60,
                60
              ],
              "loudestDb": 70,
              "mode": "add",
              "notChecked": [
                "coherent sources (identical signals in phase add 6 dB, not 3 dB, and can cancel)",
                "frequency weighting: A-weighted and unweighted levels must not be mixed",
                "…2 more"
              ],
              "reasons": [
                "Levels are converted to energy, summed, and converted back; the loudest source dominates.",
                "Equal sources add 3 dB per doubling."
              ],
              "source": "Energy summation of incoherent sound levels: L = 10 log10(sum of 10^(Li/10)), computed locally",
              "summary": "Combined level 70.792 dB from 3 sources (loudest 70 dB, +0.792 dB).",
              "totalDb": 70.791812,
              "verdict": "COMPUTED"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "background": {
                      "description": "Background level in dB to subtract from total",
                      "type": "number"
                    },
                    "count": {
                      "description": "With one level: number of identical sources (2 to 100000)",
                      "type": "integer"
                    },
                    "levels": {
                      "description": "Comma separated levels in dB to add, for example 60,60,70",
                      "type": "string"
                    },
                    "total": {
                      "description": "Measured total level in dB, for background subtraction",
                      "type": "number"
                    }
                  },
                  "required": [],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "averageDb": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "count": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "increaseDb": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "levelsDb": {
                      "items": {
                        "type": "number"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "loudestDb": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "mode": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "totalDb": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:36:34.164Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:36:33.92Z"
    },
    "resource": "https://audio-calc.x402tookit.com/db-sum",
    "serviceName": "Audio Calc",
    "tags": [
      "acoustics",
      "decibels",
      "noise",
      "spl"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Add, average or subtract sound levels in dB: total of several sources, N identical sources, or background-corrected level."
}

What the leaf hashes

{"body":"c401c73b2ebdb26d1a917721a38399ddc685d12cc634bf9a13fccdf8e21794f3","id":2202262,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646814777236,"prev":null,"subject":"x402_bazaar:https://audio-calc.x402tookit.com/db-sum","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-11-02 (444186 rows).

1. 0x9245bfab7fe9b2eba27182a4aa89768ba576b9d6ad57523fc1857f75959323b7
2. 0x2d2009eb938bb371b62de6ecf965fed49b1a84c6267494288945260ebdc1a18a
3. 0x24ff7af8158b8d3c873532ef4fd287eac2bd8d3ac4ae868f619dd6a4eb09f27f
4. 0x6af74048cf97f100f7ac0a4c5ebba81c8842f142a38958079b458184e3ca096c
5. 0x50e9b35b2ff55f741c9863e90513c304929963e21dc6cbcccb7b78103926df75
6. 0x20ccc3d95196989942de40d7b549a2a5ec5715ac453d569345306043c5a8d5ba
7. 0x36eb2d9765e28762c8002f6d87de1dac4d40a7c40d25d9c8749c9acc738e2e40
8. 0x74e3ccff79ffaa7e73767664b13f206197a766d65118b818848233c7ac7a11ee
9. 0x6728eddb967e3a66b06fd5c0029dc3cc6b77e984daa922b68e0a29560eabe25d
10. 0x7840af42bd3d4ee4c322b2a126912f2129f6357fbe8b99bd2c95662ebced17df
11. 0xe58f4ad3bbf35f93bef880480cd21c5c1df0b7fad937563c21da1a8b6bc47cd4
12. 0x132b7eb9839b9a3992040318f9144c58f82ba495d3a19d95d05ee1b6917c441b
13. 0xa17f6a1bac5d26cc57d2e02b81d6f7d4d897fa15d99d32d506b3ff7cbcfd9c03
14. 0xece99d4dfafa93913edbe131eb22b3d7ab2648b58b5bd9dcd361be4f8953b107
15. 0x5d92631d189bd0292c27a05f85a5ec38ec5f4197dfe4660eb991dc6a511e25a6
16. 0x5e23ec5954c11a4530aab8c635a72b12bcfeb6fcb03c6cb1a990cc1743424543
17. 0x1805ef693fbdb2c23fcb61616f830408ca89bec1dc5b68ee47a770ffc0b9760a
18. 0x4d205063c881c48edbbb37762a8d3bbb7444d4c42daa882f663a231893d25c35
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af