← The evidence ledger
Evidence row 2202243
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://aviation-calc.x402tookit.com/density-altitude
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- ee7160317fd1fbda3f0104b1eb80c31fc4718b13f06534ec1189ff294b2c6d12
- Leaf
- 0x3ac3887cfdc4ccdf5c719554e26ddf57bd5b6453ecb62f2a09898d9466667978
What was observed
{
"endpoints": [
[
"x402",
"https://aviation-calc.x402tookit.com/density-altitude"
]
],
"name": "Aviation 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": "Density altitude from field elevation, altimeter setting and temperature, exact and by rule of thumb, with a performance flag.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"altimeter": 29.92,
"elevationFt": 5000,
"oatC": 30,
"unit": "inhg"
},
"type": "http"
},
"output": {
"example": {
"airDensityKgM3": 0.9688,
"asOf": "2026-10-11T14:44:07.798Z",
"degraded": false,
"densityAltitudeAboveFieldFt": 2802.1,
"densityAltitudeFt": 7802.1,
"densityAltitudeRuleOfThumbFt": 7990,
"densityRatio": 0.7908,
"disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.",
"elevationFt": 5000,
"isaDeviationC": 24.91,
"isaTemperatureAtPressureAltitudeC": 5.09,
"notChecked": [
"humidity: moist air is lighter, adding a few hundred feet to density altitude on a humid hot day",
"the aircraft's actual performance: use the flight manual's charts with this density altitude, not a percentage rule",
"…2 more"
],
"oatC": 30,
"pressureAltitudeFt": 5001.1,
"reasons": [
"Density altitude is the altitude in the standard atmosphere that has the air's actual density: the aircraft performs as if it were that high.",
"The rule of thumb (pressure altitude + 120 ft per degree C above ISA) gives 7990 ft.",
"…1 more"
],
"source": "computed locally",
"stationPressureHpa": 843.04,
"summary": "Density altitude 7802 ft at a 5000 ft field (2802 ft above it): pressure altitude 5001 ft, ISA 5.1 C, actual 30 C (ISA +24.9); air density 79.1% of sea level.",
"verdict": "DENSITY_ALTITUDE_ELEVATED"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"altimeter": {
"description": "Altimeter setting: inHg like 29.92 or hPa like 1013",
"type": "number"
},
"elevationFt": {
"description": "Field elevation in feet, -1500 to 30000",
"type": "number"
},
"oatC": {
"description": "Outside air temperature in C, -60 to 60",
"type": "number"
},
"unit": {
"description": "inhg (default) or hpa",
"type": "string"
}
},
"required": [
"elevationFt",
"altimeter",
"oatC"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"airDensityKgM3": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"densityAltitudeAboveFieldFt": {
"type": [
"null",
"number"
]
},
"densityAltitudeFt": {
"type": [
"null",
"number"
]
},
"densityAltitudeRuleOfThumbFt": {
"type": [
"null",
"number"
]
},
"densityRatio": {
"type": [
"null",
"number"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"elevationFt": {
"type": [
"null",
"number"
]
},
"isaDeviationC": {
"type": [
"null",
"number"
]
},
"isaTemperatureAtPressureAltitudeC": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"oatC": {
"type": [
"null",
"number"
]
},
"pressureAltitudeFt": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"stationPressureHpa": {
"type": [
"null",
"number"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:37:32.633Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:37:32.334Z"
},
"resource": "https://aviation-calc.x402tookit.com/density-altitude",
"serviceName": "Aviation Calculators",
"tags": [
"aviation",
"density-altitude",
"performance",
"e6b",
"calculator"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Density altitude from field elevation, altimeter setting and temperature, exact and by rule of thumb, with a performance flag."
}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