← The evidence ledger
Evidence row 2202140
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://calendar-systems.x402tookit.com/seasons
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- f38f859988bfedf286850c5c0e5cfeb51db1f11ce414961fdae3a5f0727f5713
- Leaf
- 0x2476cc1a7b5e0616a54a62d215a4bad7c1085b48a3b71447f0077f266180c850
What was observed
{
"endpoints": [
[
"x402",
"https://calendar-systems.x402tookit.com/seasons"
]
],
"name": "Calendar Systems",
"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": "March and September equinox and June and December solstice moments (UTC) for a year, with season lengths in days.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"year": 2026
},
"type": "http"
},
"output": {
"example": {
"accuracy": "about 1 minute",
"asOf": "2026-10-11T08:54:34.949Z",
"decemberSolstice": "2026-12-21T20:50Z",
"decemberSolsticeJd": 2461396.36813,
"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.",
"juneSolstice": "2026-06-21T08:25Z",
"juneSolsticeJd": 2461212.85057,
"marchEquinox": "2026-03-20T14:45Z",
"marchEquinoxJd": 2461120.11493,
"notChecked": [
"accuracy is about 1 minute (worst 0.6 minute measured against Astronomy Engine over 1900 to 2100), so a time within a minute of midnight could fall on the neighbouring UTC date",
"local time zones",
"…2 more"
],
"reasons": [
"Moments are when the Sun's apparent ecliptic longitude is 0, 90, 180 and 270 degrees, in UTC.",
"Delta T of about 75.4 s was applied to convert from dynamical time to UT."
],
"seasonLengthsDays": {
"fromDecemberSolstice": 88.982,
"fromJuneSolstice": 93.653,
"fromMarchEquinox": 92.736,
"fromSeptemberEquinox": 89.864
},
"seasonStarts": [
{
"begins": "Spring (Northern Hemisphere) / Autumn (Southern)",
"event": "March equinox",
"utc": "2026-03-20T14:45Z"
},
{
"begins": "Summer (N) / Winter (S)",
"event": "June solstice",
"utc": "2026-06-21T08:25Z"
}
],
"septemberEquinox": "2026-09-23T00:05Z",
"septemberEquinoxJd": 2461306.50375,
"source": "Meeus, Astronomical Algorithms ch. 27 (24-term series) with Espenak/Meeus Delta T; computed locally",
"summary": "2026: March equinox 2026-03-20T14:45Z, June solstice 2026-06-21T08:25Z, September equinox 2026-09-23T00:05Z, December solstice 2026-12-21T20:50Z.",
"verdict": "COMPUTED",
"year": 2026
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"year": {
"description": "Gregorian year, 1900 to 2100",
"type": "integer"
}
},
"required": [
"year"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"accuracy": {
"type": [
"null",
"string"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"decemberSolstice": {
"type": [
"null",
"string"
]
},
"decemberSolsticeJd": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"juneSolstice": {
"type": [
"null",
"string"
]
},
"juneSolsticeJd": {
"type": [
"null",
"number"
]
},
"marchEquinox": {
"type": [
"null",
"string"
]
},
"marchEquinoxJd": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"seasonLengthsDays": {
"properties": {
"fromDecemberSolstice": {
"type": [
"null",
"number"
]
},
"fromJuneSolstice": {
"type": [
"null",
"number"
]
},
"fromMarchEquinox": {
"type": [
"null",
"number"
]
},
"fromSeptemberEquinox": {
"type": [
"null",
"number"
]
}
},
"type": [
"null",
"object"
]
},
"seasonStarts": {
"items": {
"properties": {
"begins": {
"type": [
"null",
"string"
]
},
"event": {
"type": [
"null",
"string"
]
},
"utc": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"septemberEquinox": {
"type": [
"null",
"string"
]
},
"septemberEquinoxJd": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"verdict": {
"type": [
"null",
"string"
]
},
"year": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:40:38.869Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:40:38.717Z"
},
"resource": "https://calendar-systems.x402tookit.com/seasons",
"serviceName": "Calendar Systems",
"tags": [
"equinox",
"solstice",
"seasons",
"astronomy"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "March and September equinox and June and December solstice moments (UTC) for a year, with season lengths in days."
}What the leaf hashes
{"body":"f38f859988bfedf286850c5c0e5cfeb51db1f11ce414961fdae3a5f0727f5713","id":2202140,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646813469247,"prev":null,"subject":"x402_bazaar:https://calendar-systems.x402tookit.com/seasons","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).
- 0x24770fa9b7c7b06e8d740119d32df302242ca97570e4f80cf5b6328fb959ead7
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- 0xa69b432250e2d844849b97e33eccddb2d3cab9ed0a2b26cf1d5fa14497116564
- 0x8efff14d95f82b6d65733ad8201060599e05953c964afbf3612216f2c9218b8f
- 0xbc49b78447c43529436b5d37cfdb37ab918511cc316903d928ea70d06d9b47d3
- 0x84c7ffa3d7baaef92d63b4ed28ddbf057c05e25f19ef875ccad41eb1fe5d700e
- 0x1c61c83d9249b30e72344ca4e8003fc86abbace3f74cb92679581188d8dd0c76
- 0x036641f4c03012a6f063ba58faebaee0bde0b19836876d5a12dc4e43f91443ba
- 0xd6b88cff77a43bbb482bc140d33ea0b9b182181e2a91a94144ca9887aa146c07
- 0xf93fa2cd854f8a27091bbeacf6b201fd8e00bdda94b33ddd84474a8e39b2783b
- 0x401f99eb33c3aca7fb1835eab8a9dc02765c5e3996fc9560617f4be6c7c50067
- 0xcd21ec8d72a18a2d4513e4fd309abbb530810fb1dbeecd4b9b85acb4d6ff8f12
- 0xac40f077ca4be8c3432a67771725cc315e8101fc2649999cfad2c900a7640e27
- 0x53a741b69e9e51c4a288a74712aa6ac3fb28c8923cd3e6461d161c4f2d48b31a
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- 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af