Evidence row 2201547

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://music-theory.x402tookit.com/freq-note"
    ]
  ],
  "name": "Music Theory",
  "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": "Frequency in Hz to the nearest note, MIDI number and offset in cents; adjustable A4 reference; tuner-style result.",
    "extensions": {
      "bazaar": {
        "info": {
          "input": {
            "method": "GET",
            "queryParams": {
              "hz": 442
            },
            "type": "http"
          },
          "output": {
            "example": {
              "a4Hz": 440,
              "asOf": "2026-10-11T14:26:13.473Z",
              "centsOffset": 7.85,
              "degraded": false,
              "direction": "sharp of the note",
              "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
              "fractionalMidi": 69.0785,
              "frequencyHz": 442,
              "midi": 69,
              "nearestFrequencyHz": 440,
              "nearestNote": "A4",
              "notChecked": [
                "octave errors from a pitch detector (this assumes the frequency you gave is the fundamental)",
                "non-equal temperaments",
                "…1 more"
              ],
              "reasons": [
                "Cents = 1200 x log2(f / f_note); 100 cents is one semitone.",
                "IN_TUNE means within 5 cents of the nearest note."
              ],
              "source": "computed locally (12-tone equal temperament)",
              "summary": "442 Hz is A4 (MIDI 69) +7.85 cents (A4 = 440 Hz).",
              "verdict": "OFF_PITCH"
            },
            "type": "json"
          }
        },
        "schema": {
          "$schema": "https://json-schema.org/draft/2020-12/schema",
          "properties": {
            "input": {
              "additionalProperties": false,
              "properties": {
                "method": {
                  "enum": [
                    "GET"
                  ],
                  "type": "string"
                },
                "queryParams": {
                  "properties": {
                    "a4": {
                      "description": "Reference pitch for A4 in Hz, 400 to 480 (default 440)",
                      "type": "number"
                    },
                    "accidentals": {
                      "description": "sharps (default) or flats for the note name",
                      "type": "string"
                    },
                    "hz": {
                      "description": "Frequency in Hz, 8 to 14000",
                      "type": "number"
                    }
                  },
                  "required": [
                    "hz"
                  ],
                  "type": "object"
                },
                "type": {
                  "const": "http",
                  "type": "string"
                }
              },
              "required": [
                "type",
                "method"
              ],
              "type": "object"
            },
            "output": {
              "properties": {
                "example": {
                  "properties": {
                    "a4Hz": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "asOf": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "centsOffset": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "degraded": {
                      "type": [
                        "boolean",
                        "null"
                      ]
                    },
                    "direction": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "disclaimer": {
                      "type": [
                        "null",
                        "string"
                      ]
                    },
                    "fractionalMidi": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "frequencyHz": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "midi": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "nearestFrequencyHz": {
                      "type": [
                        "null",
                        "number"
                      ]
                    },
                    "nearestNote": {
                      "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"
                      ]
                    },
                    "verdict": {
                      "type": [
                        "null",
                        "string"
                      ]
                    }
                  },
                  "type": "object"
                },
                "type": {
                  "type": "string"
                }
              },
              "required": [
                "type"
              ],
              "type": "object"
            }
          },
          "required": [
            "input"
          ],
          "type": "object"
        }
      }
    },
    "lastUpdated": "2026-11-01T23:39:36.357Z",
    "quality": {
      "l30DaysTotalCalls": 2,
      "l30DaysUniquePayers": 2,
      "lastCalledAt": "2026-11-01T23:39:36.171Z"
    },
    "resource": "https://music-theory.x402tookit.com/freq-note",
    "serviceName": "Music Theory",
    "tags": [
      "music",
      "tuner",
      "frequency",
      "cents"
    ],
    "type": "http",
    "x402Version": 2
  },
  "source": "x402_bazaar",
  "summary": "Frequency in Hz to the nearest note, MIDI number and offset in cents; adjustable A4 reference; tuner-style result."
}

What the leaf hashes

{"body":"56e3883a660849fec469dce92f4363d0c7a969469e0eb81633513191aea77096","id":2201547,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806613151,"prev":null,"subject":"x402_bazaar:https://music-theory.x402tookit.com/freq-note","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. 0xb6c72d72a26a3ecd0e8831c697da309b93f2528fbedb8c60264dd527178169aa
2. 0x35759a92cd55a46e7afd99dbf46bb160a77db27b12e1a67ebd84caaafac7232d
3. 0x14c2bcc8d2e4e3aae081534a5948317280066e7eb2d87a96c3a767adca653fb0
4. 0x022232e3a6e8999a3e928bab85d168613badf2decc467770c17af8bb64352c60
5. 0xb61afb5efeabde973f97f5e6106349fb581498ea04eb1d5d5bc1098a4cb62070
6. 0x1b28adf9e33468cd6a6289f0abf8dd02f8a72b99b6180c555c0bd047bcbfcbf1
7. 0x4ef9594661e57160bc9866c6e9b51fcb93739f09851e0b88648f727a0c1bfd29
8. 0x169fa5b880e3cc8be889d598630f7e9e0157ee3720d99e2c7c5633c73532af56
9. 0x75df693af41ba1351bca8aa60151ff44598833a699a6ee119aa5d47b986de45b
10. 0xc9c8f640713eae41e8f93d0df0f8d780c508a161d00d08d1bebbf047704f6e07
11. 0xb90715a9e02eae65281cf69fec6269cca4f892eb446184da6ee783020656c01f
12. 0x1e746a5fe19cb9ec0a19b0ddff5c240ad1117a5db0999c1e01fe8f1235d88e30
13. 0x030e61e00342e920981555e2e665fa5ec4a741b10a078f282daa829896c87583
14. 0x08da04eef748b7ac08271324db18913501d72c52afa240bf3f08b6da46e3b97f
15. 0x834b6b9a36b42da183e2542785e8d2d7548ace455268a81922edbe6020cef644
16. 0x2922573a524a0694086782ac45fa3083d3fc3f6a2a479b2105e1e2f06b2916f7
17. 0x07ad80c0c234ecea379a2f4450dfd0804db049dbc62abe77af6306049ca6b6c2
18. 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
19. 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884

Day root

0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1

Chained

0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2

Published

On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af