← The evidence ledger
Evidence row 2202259
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://audio-calc.x402tookit.com/lufs-math
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- a0213fa371ce52408dda49fa8a417307dc4f4d2375d293990b89e02c25ace336
- Leaf
- 0xd6714448b3df2afed8d2312c1e9e7bf661d91bec803cba231ae7eec81fc04fe2
What was observed
{
"endpoints": [
[
"x402",
"https://audio-calc.x402tookit.com/lufs-math"
]
],
"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": "Loudness maths: gain to a LUFS target or platform, resulting true peak vs ceiling, or combining segment loudness.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"ceilingDbtp": -1,
"lufs": -9.5,
"target": "spotify",
"truePeakDbtp": -0.3
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:38:34.877Z",
"ceilingDbtp": -1,
"combinedLufs": null,
"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.",
"gainDb": -4.5,
"gainLinear": 0.595662,
"limitingNeeded": false,
"loudestSegmentLufs": null,
"measuredLufs": -9.5,
"mode": "gain",
"newTruePeakDbtp": -4.8,
"notChecked": [
"BS.1770 gating (absolute -70 LUFS and relative -10 LU): combining segments here averages ALL energy ungated, so measure a whole programme with a meter for a delivery value",
"loudness range and short-term or momentary limits (for example the EBU R128 +-0.5 LU tolerance)",
"…2 more"
],
"peakHeadroomDb": 3.8,
"platform": "spotify",
"platformTargets": {
"amazon-music": -14,
"apple-music": -16,
"arib-tr-b32": -24,
"atsc-a85": -24,
"ebu-r128": -23,
"podcast": -16,
"spotify": -14,
"tidal": -14,
"youtube": -14
},
"quietestSegmentLufs": null,
"reasons": [
"Loudness changes dB for dB with gain, so the gain is simply target minus measured.",
"Turning down never raises the peak."
],
"segmentCount": null,
"source": "ITU-R BS.1770 / EBU R128 loudness arithmetic (level offsets add in dB; energies average linearly); platform targets as commonly published, computed locally",
"summary": "-9.5 LUFS to -14 LUFS (spotify): -4.5 dB. True peak -0.3 becomes -4.8 dBTP, 3.8 dB under the -1 dBTP ceiling.",
"targetLufs": -14,
"totalSeconds": null,
"verdict": "TURN_DOWN"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"ceilingDbtp": {
"description": "True-peak ceiling in dBTP (default -1)",
"type": "number"
},
"lufs": {
"description": "Measured integrated loudness in LUFS (negative), for example -9.5",
"type": "number"
},
"segments": {
"description": "To combine: lufs:seconds pairs, for example -20:30,-10:30",
"type": "string"
},
"target": {
"description": "Target LUFS or a name: spotify, youtube, apple-music, amazon-music, tidal, podcast, ebu-r128, atsc-a85, arib-tr-b32",
"type": "string"
},
"truePeakDbtp": {
"description": "Measured true peak in dBTP, to predict the peak after the gain",
"type": "number"
}
},
"required": [],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"ceilingDbtp": {
"type": [
"null",
"number"
]
},
"combinedLufs": {},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"gainDb": {
"type": [
"null",
"number"
]
},
"gainLinear": {
"type": [
"null",
"number"
]
},
"limitingNeeded": {
"type": [
"boolean",
"null"
]
},
"loudestSegmentLufs": {},
"measuredLufs": {
"type": [
"null",
"number"
]
},
"mode": {
"type": [
"null",
"string"
]
},
"newTruePeakDbtp": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"peakHeadroomDb": {
"type": [
"null",
"number"
]
},
"platform": {
"type": [
"null",
"string"
]
},
"platformTargets": {
"properties": {
"amazon-music": {
"type": [
"null",
"number"
]
},
"apple-music": {
"type": [
"null",
"number"
]
},
"arib-tr-b32": {
"type": [
"null",
"number"
]
},
"atsc-a85": {
"type": [
"null",
"number"
]
},
"ebu-r128": {
"type": [
"null",
"number"
]
},
"podcast": {
"type": [
"null",
"number"
]
},
"spotify": {
"type": [
"null",
"number"
]
},
"tidal": {
"type": [
"null",
"number"
]
},
"youtube": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"quietestSegmentLufs": {},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"segmentCount": {},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"targetLufs": {
"type": [
"null",
"number"
]
},
"totalSeconds": {},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:36:42.871Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:36:42.694Z"
},
"resource": "https://audio-calc.x402tookit.com/lufs-math",
"serviceName": "Audio Calc",
"tags": [
"audio",
"lufs",
"loudness",
"mastering"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Loudness maths: gain to a LUFS target or platform, resulting true peak vs ceiling, or combining segment loudness."
}What the leaf hashes
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Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (444186 rows).
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- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af