Evidence row 2201945

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://electronics-calc.x402tookit.com/decibels"
    ]
  ],
  "name": "Electronics Calculators",
  "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": "Decibel conversions: power or voltage ratio to dB and back, and dBm to milliwatts and watts and back.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "kind": "power",
              "ratio": 2
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-11T08:33:11.204Z",
              "db": 3.010299957,
              "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.",
              "kind": "power",
              "notChecked": [
                "reference levels other than 1 mW (dBV, dBu, dBSPL, dBW need their own reference)",
                "adding decibels from separate sources (power sums, not dB sums)"
              ],
              "ratio": 2,
              "reasons": [
                "dB = 10 x log10(ratio) for power quantities."
              ],
              "source": "computed locally",
              "summary": "A power ratio of 2 is 3.0103 dB.",
              "verdict": "RATIO_TO_DB"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "db": {
                      "description": "dB value to convert to a ratio",
                      "type": "number"
                    },
                    "dbm": {
                      "description": "dBm to convert to mW and W",
                      "type": "number"
                    },
                    "kind": {
                      "description": "power (10 log, default) or amplitude (20 log: voltage, current, pressure)",
                      "type": "string"
                    },
                    "milliwatts": {
                      "description": "mW to convert to dBm",
                      "type": "number"
                    },
                    "ratio": {
                      "description": "Linear ratio to convert to dB",
                      "type": "number"
                    }
                  },
                  "required": [],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "db": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "kind": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "ratio": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:51:36.372Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:51:36.178Z"
    },
    "resource": "https://electronics-calc.x402tookit.com/decibels",
    "serviceName": "Electronics Calculators",
    "tags": [
      "electronics",
      "decibel",
      "dbm",
      "rf",
      "audio"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Decibel conversions: power or voltage ratio to dB and back, and dBm to milliwatts and watts and back."
}

What the leaf hashes

{"body":"cba015c189f64e4df31ac32cb37ca18f48f3ec04947658b439fc16ee87529d60","id":2201945,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646810961490,"prev":null,"subject":"x402_bazaar:https://electronics-calc.x402tookit.com/decibels","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. 0x1d37ce996856244c14ab1041359904aca779e05c8903a90f4a08f5b79b743ef8
2. 0x18f355214892cae0fc9ad31dafdcb89cf6276e97768995f2781f48e59a888272
3. 0x8c3664886d1abcd94323c9c163089517a2f8db8976acaa2b60aa09098cb707cf
4. 0x96814c4c29e89c1c297fa74cb07c98bef7ae4b5e4c552dad7c141d8a0ab2bf7f
5. 0x3dbe623f1a2092280d7e533762a54b64eca76b43fb10225655942b661771156b
6. 0x3bf74b1be634eb44af9ae1455aeaaf9d3aa97883b2b5818c0bb8d5ee4b483fb4
7. 0x41261877e2fbd09e50789e12ad01c0ba2bc73658d5c9b49ecfcde90b54205eb1
8. 0xc6c426148145dd5f22c4c348458e4d66813f91e0c791f8d849f29e9f95a88eb0
9. 0x5d36750836be1ae96f2c6a6a562e79d0514b8af50b971d5795c426b532333e65
10. 0xd888ab532ca61ab38e2100ae72302600caf86b4557f40f190089bfd07472ac52
11. 0x1958dba7b75c9cafc665741f77e7dcaa26c468963f73c107738b97fbcb474191
12. 0xfa646e4b5dbdebf795dfda0b29a3ea57332f8666459a0c2538f16fe8103169aa
13. 0xd6cbf3765149b25eba4e10fe21fd5993687ecdd3cb9c495f97c3c148afee08ed
14. 0xc63937235d47ff2107de3051477e395be67b96d91d1349c787bf4b1ef91b602f
15. 0xcd21ec8d72a18a2d4513e4fd309abbb530810fb1dbeecd4b9b85acb4d6ff8f12
16. 0xac40f077ca4be8c3432a67771725cc315e8101fc2649999cfad2c900a7640e27
17. 0x53a741b69e9e51c4a288a74712aa6ac3fb28c8923cd3e6461d161c4f2d48b31a
18. 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
19. 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af