← The evidence ledger
Evidence row 2202070
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://cooking-calc.x402tookit.com/abv-gravity
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 5c961c60b77a6aa5ac3b0c5b5cd229be41d3cff1c26cdc5c467b0467a186f739
- Leaf
- 0xbb7bd97fcdd617f0b700b109a279920650b9df42627d3dea71ccf8fa95481aed
What was observed
{
"endpoints": [
[
"x402",
"https://cooking-calc.x402tookit.com/abv-gravity"
]
],
"name": "Cooking Calculators",
"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": "Beer, wine and cider alcohol by volume from original and final gravity, with both standard formulas and attenuation.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"finalGravity": 1.01,
"originalGravity": 1.05
},
"type": "http"
},
"output": {
"example": {
"abvAdvancedPercent": 5.3394,
"abvPercent": 5.295,
"abvRangePercent": [
5.25,
5.339
],
"abvSimplePercent": 5.25,
"apparentAttenuationPercent": 80,
"asOf": "2026-10-11T14:26:07.690Z",
"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.",
"finalGravity": 1.01,
"gravityPoints": 50,
"notChecked": [
"hydrometer temperature correction (readings are taken at the instrument's calibration temperature, usually 20 C / 68 F)",
"alcohol made from unfermented sugar added later, or very high gravities where both formulas drift",
"…2 more"
],
"originalGravity": 1.05,
"preferredFormula": "average of both",
"reasons": [
"Simple: ABV = (OG - FG) x 131.25. Advanced: ABV = 76.08 (OG - FG) / (1.775 - OG) x (FG / 0.794).",
"The two formulas agree within about 0.1 points for ordinary beers and diverge for strong brews."
],
"source": "computed locally",
"summary": "Original 1.050 and final 1.010 give about 5.29% ABV (simple formula 5.25%, advanced 5.34%); apparent attenuation 80%.",
"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": {
"finalGravity": {
"description": "Specific gravity after fermentation, 0.980 to 1.200 and not above the original",
"type": "number"
},
"originalGravity": {
"description": "Specific gravity before fermentation, 1.000 to 1.200, for example 1.050",
"type": "number"
}
},
"required": [
"originalGravity",
"finalGravity"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"abvAdvancedPercent": {
"type": [
"null",
"number"
]
},
"abvPercent": {
"type": [
"null",
"number"
]
},
"abvRangePercent": {
"items": {
"type": "number"
},
"type": [
"array",
"null"
]
},
"abvSimplePercent": {
"type": [
"null",
"number"
]
},
"apparentAttenuationPercent": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"finalGravity": {
"type": [
"null",
"number"
]
},
"gravityPoints": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"originalGravity": {
"type": [
"null",
"number"
]
},
"preferredFormula": {
"type": [
"null",
"string"
]
},
"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": "2026-11-01T22:44:06.862Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:44:06.614Z"
},
"resource": "https://cooking-calc.x402tookit.com/abv-gravity",
"serviceName": "Cooking Calculators",
"tags": [
"brewing",
"abv",
"fermentation",
"cooking",
"calculator"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Beer, wine and cider alcohol by volume from original and final gravity, with both standard formulas and attenuation."
}What the leaf hashes
{"body":"5c961c60b77a6aa5ac3b0c5b5cd229be41d3cff1c26cdc5c467b0467a186f739","id":2202070,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812385401,"prev":null,"subject":"x402_bazaar:https://cooking-calc.x402tookit.com/abv-gravity","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).
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- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af