← The evidence ledger
Evidence row 2201912
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://exoplanets-nasa.x402tookit.com/planet-habitability
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- bfa56d772edc060b96c416e6f8724c04280b374d2833d5697d6b7c80620b38e4
- Leaf
- 0xb2c8af33051b137b08604f2f40d56e3b83e215158966a16bc72cac444a47eb59
What was observed
{
"endpoints": [
[
"x402",
"https://exoplanets-nasa.x402tookit.com/planet-habitability"
]
],
"name": "NASA Exoplanets",
"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": "Habitable-zone screen for a named exoplanet: orbit versus the zone edges, size class and rocky-planet plausibility.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"name": "Kepler-442 b"
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-11T08:48:46.408Z",
"conservativeZoneAu": [
0.358,
0.656
],
"controversial": false,
"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.",
"earthRatios": {
"density": 0.9808,
"densityGcc": 5.408,
"escapeVelocityKmS": 14.84,
"escapeVelocityRatio": 1.327,
"mass": 2.36,
"radius": 1.34,
"surfaceGravity": 1.314
},
"equilibriumTempK": {
"archiveValue": 241,
"earthLikeAlbedo0p3": 232.8,
"zeroAlbedo": 254.5
},
"host": "Kepler-442",
"hzMethod": "Kopparapu et al. 2013, ApJ 765, 131: S_eff = S0 + aT + bT^2 + cT^3 + dT^4, T = Teff - 5780; distance = sqrt(L / S_eff)",
"insolationEarth": 0.699,
"luminositySolar": 0.1169,
"luminositySource": "archive luminosity (log10 solar)",
"massEarth": 2.36,
"massIsMinimum": false,
"name": "Kepler-442 b",
"notChecked": [
"atmosphere, magnetic field, water, tidal locking, flares and stellar activity: none are known for most planets",
"whether the planet is rocky: a radius under about 1.6 Earth radii makes a rocky planet likely, but mass is often unknown",
"…2 more"
],
"optimisticZoneAu": [
0.27,
0.682
],
"orbitAu": 0.409,
"orbitSource": "archive semi-major axis",
"position": "INSIDE_CONSERVATIVE_ZONE",
"radiusEarth": 1.34,
"reasons": [
"Method: Kopparapu et al. 2013 climate-model flux limits (moist greenhouse and maximum greenhouse for the conservative zone; recent Venus and early Mars for the optimistic zone), scaled by stellar lumi…",
"Radius 1.34 Earth radii is within the range where planets are usually rocky (about 1.6 or less).",
"…2 more"
],
"sizeClass": "super-Earth",
"source": "NASA Exoplanet Archive (Caltech/IPAC)",
"sourceUrl": "https://exoplanetarchive.ipac.caltech.edu",
"starTempInModelRange": true,
"summary": "Kepler-442 b orbits at 0.409 au; the Kepler-442 habitable zone spans 0.358 to 0.656 au (conservative) and 0.27 to 0.682 au (optimistic): inside conservative hz. Size class: super-Earth.",
"verdict": "INSIDE_CONSERVATIVE_HZ"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"name": {
"description": "Planet name, for example TRAPPIST-1 e or Kepler-442 b",
"type": "string"
}
},
"required": [
"name"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"conservativeZoneAu": {
"items": {
"type": "number"
},
"type": [
"array",
"null"
]
},
"controversial": {
"type": [
"boolean",
"null"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"earthRatios": {
"properties": {
"density": {
"type": [
"null",
"number"
]
},
"densityGcc": {
"type": [
"null",
"number"
]
},
"escapeVelocityKmS": {
"type": [
"null",
"number"
]
},
"escapeVelocityRatio": {
"type": [
"null",
"number"
]
},
"mass": {
"type": [
"null",
"number"
]
},
"radius": {
"type": [
"null",
"number"
]
},
"surfaceGravity": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"equilibriumTempK": {
"properties": {
"archiveValue": {
"type": [
"null",
"number"
]
},
"earthLikeAlbedo0p3": {
"type": [
"null",
"number"
]
},
"zeroAlbedo": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"host": {
"type": [
"null",
"string"
]
},
"hzMethod": {
"type": [
"null",
"string"
]
},
"insolationEarth": {
"type": [
"null",
"number"
]
},
"luminositySolar": {
"type": [
"null",
"number"
]
},
"luminositySource": {
"type": [
"null",
"string"
]
},
"massEarth": {
"type": [
"null",
"number"
]
},
"massIsMinimum": {
"type": [
"boolean",
"null"
]
},
"name": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"optimisticZoneAu": {
"items": {
"type": "number"
},
"type": [
"array",
"null"
]
},
"orbitAu": {
"type": [
"null",
"number"
]
},
"orbitSource": {
"type": [
"null",
"string"
]
},
"position": {
"type": [
"null",
"string"
]
},
"radiusEarth": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"sizeClass": {
"type": [
"null",
"string"
]
},
"source": {
"type": [
"null",
"string"
]
},
"sourceUrl": {
"type": [
"null",
"string"
]
},
"starTempInModelRange": {
"type": [
"boolean",
"null"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:53:22.871Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:53:22.695Z"
},
"resource": "https://exoplanets-nasa.x402tookit.com/planet-habitability",
"serviceName": "NASA Exoplanets",
"tags": [
"exoplanet",
"habitable-zone",
"nasa",
"screen",
"astronomy"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Habitable-zone screen for a named exoplanet: orbit versus the zone edges, size class and rocky-planet plausibility."
}What the leaf hashes
{"body":"bfa56d772edc060b96c416e6f8724c04280b374d2833d5697d6b7c80620b38e4","id":2201912,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646810173148,"prev":null,"subject":"x402_bazaar:https://exoplanets-nasa.x402tookit.com/planet-habitability","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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- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af