← The evidence ledger
Evidence row 2201545
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://music-theory.x402tookit.com/key-signature
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 0726bf2515ee37be4ab6ec845ed174bfe32e26854aa50bac929fada6dcf7d095
- Leaf
- 0x60d7f91809cbdcf3760faa90609bb58f7a4b4633ad81d1abe9382da88cf3b044
What was observed
{
"endpoints": [
[
"x402",
"https://music-theory.x402tookit.com/key-signature"
]
],
"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": "Key signature (sharps or flats), circle-of-fifths neighbours, relative and parallel keys for any major or minor key.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"key": "Eb"
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T14:26:13.995Z",
"circleOfFifths": [
{
"accidentals": "0 sharps",
"clock": 0,
"major": "C",
"minor": "Am"
},
{
"accidentals": "1 sharp",
"clock": 1,
"major": "G",
"minor": "Em"
}
],
"circleOfFifthsClockPosition": 9,
"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.",
"dominantKey": "Bb major",
"enharmonicKey": null,
"fifthsPosition": -3,
"key": "Eb major",
"notChecked": [
"modal key signatures (dorian and so on use the signature of their parent major key)",
"key changes inside a piece",
"…1 more"
],
"parallelKey": "Eb minor",
"parallelSignature": {
"accidentals": [
"Bb",
"Eb",
"…4 more"
],
"count": 6,
"theoretical": false,
"type": "flats"
},
"reasons": [],
"relativeKey": "C minor",
"scaleNotes": [
"Eb",
"F",
"…5 more"
],
"signature": {
"accidentals": [
"Bb",
"Eb",
"…1 more"
],
"count": 3,
"theoretical": false,
"type": "flats"
},
"source": "computed locally",
"subdominantKey": "Ab major",
"summary": "Eb major: 3 flats (Bb Eb Ab); relative Cm, parallel Ebm.",
"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": {
"key": {
"description": "Key: C, G, Bb, F# minor, Am, Ebm",
"type": "string"
}
},
"required": [
"key"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"circleOfFifths": {
"items": {
"properties": {
"accidentals": {
"type": [
"null",
"string"
]
},
"clock": {
"type": [
"null",
"number"
]
},
"major": {
"type": [
"null",
"string"
]
},
"minor": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"circleOfFifthsClockPosition": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"dominantKey": {
"type": [
"null",
"string"
]
},
"enharmonicKey": {},
"fifthsPosition": {
"type": [
"null",
"number"
]
},
"key": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"parallelKey": {
"type": [
"null",
"string"
]
},
"parallelSignature": {
"properties": {
"accidentals": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"count": {
"type": [
"null",
"number"
]
},
"theoretical": {
"type": [
"boolean",
"null"
]
},
"type": {
"type": [
"null",
"string"
]
}
},
"type": [
"null",
"object"
]
},
"reasons": {
"type": [
"array",
"null"
]
},
"relativeKey": {
"type": [
"null",
"string"
]
},
"scaleNotes": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"signature": {
"properties": {
"accidentals": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"count": {
"type": [
"null",
"number"
]
},
"theoretical": {
"type": [
"boolean",
"null"
]
},
"type": {
"type": [
"null",
"string"
]
}
},
"type": [
"null",
"object"
]
},
"source": {
"type": [
"null",
"string"
]
},
"subdominantKey": {
"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": "2026-11-01T23:39:42.128Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T23:39:41.945Z"
},
"resource": "https://music-theory.x402tookit.com/key-signature",
"serviceName": "Music Theory",
"tags": [
"music",
"key-signature",
"circle-of-fifths",
"theory"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Key signature (sharps or flats), circle-of-fifths neighbours, relative and parallel keys for any major or minor key."
}What the leaf hashes
{"body":"0726bf2515ee37be4ab6ec845ed174bfe32e26854aa50bac929fada6dcf7d095","id":2201545,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646806605705,"prev":null,"subject":"x402_bazaar:https://music-theory.x402tookit.com/key-signature","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).
- 0x60d82add72ede98ef938210254a58a46b4bb8665bd1b51e359f9a6daed5453b5
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- 0x888d37151e7726491b8965a85b1121877cf57d0dd639eeea0c91d759432bd3fe
- 0xbf3472c96a602b2732cb2b1c9f9d22bfa80500b67e8ca8863bcd883203dab5fd
- 0xe3b2f0beaefb1c2aa4559989952dd2e3b5e7eab462b623e6bc69c314bcde4bec
- 0x8205e96175302f72de6adf63635e25418b006656ef9669f33881d6a3728ba2f0
- 0x16911326dcd16e8ddd241cea6150682180cb4434320a0811e0e18dd5a226a974
- 0xabd9ea0ed6034fe9ec9a545a2cc7ead795c4ef93ad26f3922ec6093f62aaf439
- 0x6b4875590ee8954f5315611ea1c32c35ce609ce69cc5cd56dab438a799f4f825
- 0xfcf5d9c790c40588489c41a23736feba4efc9e83eda3317c30f53a98ce8d1d89
- 0x6ae97c2bdc679e3326a739627f6c3a307d7e25e547b9bf23dbf2622fb26d858e
- 0x23f4763e8db2efe57fbc28dfc68f2b97b65f54a03425994e68157763af649a50
- 0x0e5696ae625571c52ddcd8dc09aa6c994b4ab38f2086df20d56f1f01c603e501
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- 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af