Evidence row 2202256

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://audio-calc.x402tookit.com/sound-wavelength"
    ]
  ],
  "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": "Speed of sound in air at a temperature, wavelength and period for a frequency or the reverse, with delay per metre.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "frequencyHz": 1000,
              "temperatureC": 20
            },
            "type": "http"
          },
          "output": {
            "example": {
              "asOf": "2026-10-11T14:38:35.670Z",
              "degraded": false,
              "delayMs": null,
              "delayPerMetreMs": 2.913629,
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "distanceM": null,
              "feetPerMillisecond": 1.126032,
              "frequencyHz": 1000,
              "halfWavelengthM": 0.17160731,
              "metresPerMillisecond": 0.343215,
              "notChecked": [
                "humidity (moist air is slightly faster: about +0.3 m/s at 20 C and 50% humidity)",
                "altitude: speed of sound depends on temperature, not pressure, but temperature changes with height",
                "…2 more"
              ],
              "periodMs": 1,
              "quarterWavelengthM": 0.08580366,
              "reasons": [
                "Speed of sound rises about 0.6 m/s per degree C.",
                "Each metre of distance adds 2.9136 ms of delay."
              ],
              "source": "c = 331.3 sqrt(1 + T/273.15) m/s for dry air; wavelength = c / f, computed locally",
              "speedOfSoundMs": 343.2146,
              "summary": "At 20 C sound travels 343.21 m/s: 1000 Hz has a wavelength of 0.34321 m (period 1 ms).",
              "temperatureC": 20,
              "verdict": "COMPUTED",
              "wavelengthCm": 34.321462,
              "wavelengthM": 0.34321462
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "delayMs": {
                      "description": "A delay in ms to turn into a distance",
                      "type": "number"
                    },
                    "distanceM": {
                      "description": "A distance in metres to turn into a delay",
                      "type": "number"
                    },
                    "frequencyHz": {
                      "description": "Frequency in Hz (use this, or wavelengthM, or delayMs)",
                      "type": "number"
                    },
                    "temperatureC": {
                      "description": "Air temperature in C (default 20)",
                      "type": "number"
                    },
                    "wavelengthM": {
                      "description": "Wavelength in metres",
                      "type": "number"
                    }
                  },
                  "required": [],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "delayMs": {},
                    "delayPerMetreMs": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "distanceM": {},
                    "feetPerMillisecond": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "frequencyHz": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "halfWavelengthM": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "metresPerMillisecond": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "notChecked": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "periodMs": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "quarterWavelengthM": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "reasons": {
                      "items": {
                        "type": "string"
                      },
                      "type": [
                        "array",
                        "null"
                      ]
                    },
                    "source": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "speedOfSoundMs": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "summary": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "temperatureC": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "wavelengthCm": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "wavelengthM": {
                      "type": [
                        "null",
                        "number"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T22:36:51.821Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T22:36:51.644Z"
    },
    "resource": "https://audio-calc.x402tookit.com/sound-wavelength",
    "serviceName": "Audio Calc",
    "tags": [
      "acoustics",
      "wavelength",
      "speed-of-sound",
      "delay"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Speed of sound in air at a temperature, wavelength and period for a frequency or the reverse, with delay per metre."
}

What the leaf hashes

{"body":"38f47410a2a4b02abb7892a5d9220ed9cc33b2527ca4451b1a487ffe8e89d15f","id":2202256,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646814757937,"prev":null,"subject":"x402_bazaar:https://audio-calc.x402tookit.com/sound-wavelength","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. 0xe2d1e401ae04a3318626f1bf081f8a922c448665068a03e7971f653e362a4f0d
2. 0x3052ebf8a840f7a2ba5673efd5f7d502f047a9bc0a22034423a3cff7f7c951d1
3. 0xbf70b74b30f3654f6da0ed73f3727affc5c2fa8fc43baf2b0b3c5ecb020bcfdb
4. 0xd93c72ae6bdec01aa4ae9dab612006b6ef805aa0cec4f13e7f4c57ed9cbabcc6
5. 0x8a0c5a58896eb4aaaa18d027f965110892e77108e5ec8e4601ac9f9953e1c622
6. 0x58db8599b555ae336670d5f482d612b502ddf735d3f7ee237a540e07c48a79fb
7. 0x166b4478195ef0b663fbf6e813286e66d1fb8df9f9aaacb477a4e8f8c3ecb033
8. 0x4a0e7712ffb7a67eec5583fcc693b9273df47204a4ba7eea8dcbbf2f71c25c74
9. 0xa913b78e303e6762aec2f55ed1acf54931f008a953782a6cbd646a21da5c9267
10. 0x294384aa0451df40a73b94c6209b147006e7b2c46b12e7c677e0c366c23a623c
11. 0x00a410cacc46001c3ad375a22b21ea741d3ca8cebaebbcfb24eb5a888caee471
12. 0xa425522b81e7f1b0749052147327a6c322a17427ffc07733771c29e826d80c1b
13. 0x5dd9fbf811b05f3e5af51f812b6eea86a039a192f115aecc0fd37a502e3a04f1
14. 0x3e441d3f53c7b69d6c73ef93d327dfc3071a522c550856540832b34fcb531738
15. 0xd643f764eee39146411d4bff8903a327f4f8f55616e14e57281a245206d6ed2b
16. 0x6dd7e4db65395e8670c7c2747d44fec79e03305934ef4746bf5dbca04ec6ec49
17. 0xec5d643575d83c9e07e65deeef71943b53cbf3007e7e2b9a6ef414081509b0cc
18. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af