← The evidence ledger
Evidence row 2201541
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://music-theory.x402tookit.com/tempo
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- e1bf58b631164267cb4656ce0d04b8c3a3fbfe511b4d7f308566c3bb9184c6a7
- Leaf
- 0xd5bb1aba899483eaf8f51e8d132028cddcbac0334b2e7acb59afe2c6b9066bca
What was observed
{
"endpoints": [
[
"x402",
"https://music-theory.x402tookit.com/tempo"
]
],
"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": "BPM to milliseconds for note values, dotted and triplet delay times; or average tap intervals into a steady BPM.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"bpm": 120
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:26:15.047Z",
"barMs": 2000,
"beatsPerBar": 4,
"bpm": 120,
"degraded": false,
"delayTimes": {
"dottedEighth": 375,
"eighth": 250,
"eighthTriplet": 166.67,
"note": "delay times in ms for the common divisions",
"quarter": 500,
"sixteenth": 125
},
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"notChecked": [
"swing, groove or human timing",
"whether the taps were meant as quarter notes (a half-time or double-time feel gives half or double the BPM)",
"…1 more"
],
"noteValues": [
{
"beats": 4,
"dottedMs": 3000,
"note": "whole",
"straightHz": 0.5,
"straightMs": 2000,
"tripletMs": 1333.33
},
{
"beats": 2,
"dottedMs": 1500,
"note": "half",
"straightHz": 1,
"straightMs": 1000,
"tripletMs": 666.67
}
],
"quarterNoteMs": 500,
"reasons": [
"Quarter note = 60000 / BPM milliseconds; dotted = x1.5, triplet = x2/3 of the straight value."
],
"source": "computed locally",
"summary": "120 BPM: quarter 500 ms, eighth 250 ms, dotted eighth 375 ms, sixteenth 125 ms; bar of 4 = 2000 ms.",
"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": {
"beatsPerBar": {
"description": "Beats per bar for the bar length, 1 to 16 (default 4)",
"type": "integer"
},
"bpm": {
"description": "Tempo in beats per minute, 20 to 400 (quarter note = one beat)",
"type": "number"
},
"taps": {
"description": "Tap intervals in milliseconds, comma separated: 500,512,497,505 (use instead of bpm)",
"type": "string"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"barMs": {
"type": [
"null",
"number"
]
},
"beatsPerBar": {
"type": [
"null",
"number"
]
},
"bpm": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"delayTimes": {
"properties": {
"dottedEighth": {
"type": [
"null",
"number"
]
},
"eighth": {
"type": [
"null",
"number"
]
},
"eighthTriplet": {
"type": [
"null",
"number"
]
},
"note": {
"type": [
"null",
"string"
]
},
"quarter": {
"type": [
"null",
"number"
]
},
"sixteenth": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"noteValues": {
"items": {
"properties": {
"beats": {
"type": [
"null",
"number"
]
},
"dottedMs": {
"type": [
"null",
"number"
]
},
"note": {
"type": [
"null",
"string"
]
},
"straightHz": {
"type": [
"null",
"number"
]
},
"straightMs": {
"type": [
"null",
"number"
]
},
"tripletMs": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"quarterNoteMs": {
"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": "2026-11-01T23:39:54.037Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T23:39:53.86Z"
},
"resource": "https://music-theory.x402tookit.com/tempo",
"serviceName": "Music Theory",
"tags": [
"music",
"bpm",
"tempo",
"delay-time",
"tap-tempo"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "BPM to milliseconds for note values, dotted and triplet delay times; or average tap intervals into a steady BPM."
}What the leaf hashes
{"body":"e1bf58b631164267cb4656ce0d04b8c3a3fbfe511b4d7f308566c3bb9184c6a7","id":2201541,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806589588,"prev":null,"subject":"x402_bazaar:https://music-theory.x402tookit.com/tempo","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
- 0xd5bb10494ccf3b090e9f6ea1dabaa48bd79ac399b1ddbe84f75ea12712624d64
- 0xc82aa624a59444ac5e244330f002daafc09e6e2fc9656a6403e555848c938095
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- 0xc86d6592ed213206a579b910ee1e6bb5ffaafa2ad86772dc0a0d5d1737c1dc13
- 0x91312abdef954ef7daa0b03fc83ede4587f8b9af3b0eab90232fb6b4e690e273
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- 0xb248b0f523372d9123f58592e0c99b33f9ce9893513bfe9dcf8f1a022e430d4c
- 0xc6dab1268e002fcdae4ebc2590f6e6bf90d217e83d9f44cca73ecbf5705cad85
- 0x36d2017338871ac6d86bda5fd407cc327391d6094cabb24575c2290562e50746
- 0x381b6cfdeaf8ea03cb439693a260cbb0d6ca9377a1c036675bd1e416d9d82eac
- 0x6a9bee5282acc64846540deef79ef327521ab20b00328c4b297bc96a5b4036c5
- 0xc94ac971f2e2765086823b6227f70a7d3fdcf267884d07ae0a3f85c1caf941d2
- 0xa9134f4ed9cec34e13ba243b6a51db73753dbbb3b48c63bd82b22694813d2b02
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- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af