← The evidence ledger
Evidence row 2202254
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://audio-calc.x402tookit.com/tuning-temperament
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 2a97af58c0f20d2cf6f7f03589255238e88d28d529769668d379d370ac2a4ce6
- Leaf
- 0xbc3cdf7d57812e6b0d57f20e27705b2ed120b2baf3c61f6ecd325b7860e87d91
What was observed
{
"endpoints": [
[
"x402",
"https://audio-calc.x402tookit.com/tuning-temperament"
]
],
"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": "Frequencies, cents and ratios of the 12 notes in equal, 5-limit just, Pythagorean or quarter-comma meantone tuning.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"a4": 440,
"root": "C4",
"temperament": "just"
},
"type": "http"
},
"output": {
"example": {
"a4": 440,
"asOf": "2026-10-11T14:38:36.195Z",
"degraded": false,
"description": "5-limit just intonation (symmetric chromatic scale): small whole-number ratios, pure triads on the root.",
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"fifthCents": 701.955001,
"majorThirdCents": 386.313714,
"maxDeviationFromEqualCents": 17.5963,
"minorThirdCents": 315.641287,
"notChecked": [
"historical well temperaments (Werckmeister, Kirnberger, Vallotti) and other just-intonation lattices (7-limit)",
"the choice of tritone and minor-seventh ratios in just intonation (45/32 and 9/5 here; 64/45 and 16/9 also appear in practice)",
"…2 more"
],
"notes": [
{
"cents": 0,
"centsFromEqual": 0,
"degree": 0,
"equalTemperedHz": 261.6256,
"hz": 261.6256,
"note": "C",
"ratio": 1
},
{
"cents": 111.7313,
"centsFromEqual": 11.7313,
"degree": 1,
"equalTemperedHz": 277.1826,
"hz": 279.0673,
"note": "C#",
"ratio": 1.06666667
}
],
"reasons": [
"5-limit just intonation (symmetric chromatic scale): small whole-number ratios, pure triads on the root.",
"Each frequency is the root's equal-tempered frequency times the tuning's ratio."
],
"root": "C4",
"rootHz": 261.625565,
"source": "Standard definitions of equal temperament, 5-limit just intonation, Pythagorean tuning and quarter-comma meantone, computed locally",
"summary": "just tuning on C4 (261.6256 Hz at A4 = 440): fifth 701.955 cents, major third 386.314 cents (equal: 700 and 400).",
"temperament": "just",
"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": {
"a4": {
"description": "Reference pitch for A4 in Hz (default 440); sets the root's frequency by equal temperament",
"type": "number"
},
"root": {
"description": "Root note with optional octave, for example C4 (default), D3, F#4, Bb2",
"type": "string"
},
"temperament": {
"description": "equal, just, pythagorean or meantone",
"enum": [
"equal",
"just",
"pythagorean",
"meantone"
],
"type": "string"
}
},
"required": [
"temperament"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"a4": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"description": {
"type": [
"null",
"string"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"fifthCents": {
"type": [
"null",
"number"
]
},
"majorThirdCents": {
"type": [
"null",
"number"
]
},
"maxDeviationFromEqualCents": {
"type": [
"null",
"number"
]
},
"minorThirdCents": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"notes": {
"items": {
"properties": {
"cents": {
"type": [
"null",
"number"
]
},
"centsFromEqual": {
"type": [
"null",
"number"
]
},
"degree": {
"type": [
"null",
"number"
]
},
"equalTemperedHz": {
"type": [
"null",
"number"
]
},
"hz": {
"type": [
"null",
"number"
]
},
"note": {
"type": [
"null",
"string"
]
},
"ratio": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"root": {
"type": [
"null",
"string"
]
},
"rootHz": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"temperament": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:36:57.29Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:36:57.121Z"
},
"resource": "https://audio-calc.x402tookit.com/tuning-temperament",
"serviceName": "Audio Calc",
"tags": [
"audio",
"tuning",
"temperament",
"just-intonation"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Frequencies, cents and ratios of the 12 notes in equal, 5-limit just, Pythagorean or quarter-comma meantone tuning."
}What the leaf hashes
{"body":"2a97af58c0f20d2cf6f7f03589255238e88d28d529769668d379d370ac2a4ce6","id":2202254,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646814750584,"prev":null,"subject":"x402_bazaar:https://audio-calc.x402tookit.com/tuning-temperament","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).
- 0xbc3d0f16fbd24f7f5ede78defff4101ab55d6743c06b4f93a390499751809ff3
- 0xf8614bffbaad9b765034c0b99b957e0f5cccde1e530292ddf611b444bc92317d
- 0x3297ef1c24c801663ef830c82f6c40a2ae64eec0c9a8c1c215e1a9141545b804
- 0xc32b7433e7db7a52ed04c6d99de82ad970fd54bba9737b9fc20b70bfac068a5a
- 0x8412ffab9f36df7a2893ee30f647c0380dc5614a25f26dc8448b03fdbcc96353
- 0x93ca969d5363a195e069d7d436f00c473b8aee477731d877aa452543bee3405f
- 0x7bef93404dc136b45126ae3b7ed05eab569e46a5255d31989d35ff2a13fff4f6
- 0xfbbc2f3e96db46309f5ceea557d72a65d693789efd29018cfb1335926307b668
- 0x3d381206acac62e0236c02727f10fff4b32fa698c518e46025d828b16b4a6d57
- 0x33eaf83ff3680b986d64a2d09bfb5f0ccba4815fe302481f28b059c31b4f6efe
- 0x2b23e564b52c0999f8aa4d782b4e71a40cf2bd4b0c0540b346384d450203df55
- 0xe58525446254d2108eb36448d0c82e228b172272ca44d008f01d5ed4cf747eac
- 0x626fb5c7d656fa8c4ab162a898cfff0f195757f6cb547860059c20e431ef93c9
- 0xc1d961be09ff84253ce4ecf4b141b3c25631ce9eb1cc0a3197e5d83d03240ee4
- 0x834b6b9a36b42da183e2542785e8d2d7548ace455268a81922edbe6020cef644
- 0x2922573a524a0694086782ac45fa3083d3fc3f6a2a479b2105e1e2f06b2916f7
- 0x07ad80c0c234ecea379a2f4450dfd0804db049dbc62abe77af6306049ca6b6c2
- 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af