← The evidence ledger
Evidence row 2202108
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://chess-notation.x402tookit.com/square-info
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 50e3803f6eb5bd0fa57627a5509957f41468a97b155c917f37992f529d32139e
- Leaf
- 0x9daeee0ec17613dd52c205bbbe063dc103e151dd8f8b9c2231651305c2a4467a
What was observed
{
"endpoints": [
[
"x402",
"https://chess-notation.x402tookit.com/square-info"
]
],
"name": "Chess Notation Tools",
"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": "File, rank, light or dark colour, 0-63 index, diagonals and mirror squares for a chess square like e4.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"square": "e4"
},
"type": "http"
},
"output": {
"example": {
"antiDiagonalLength": 8,
"asOf": "2026-10-12T01:02:04.635Z",
"color": "light",
"correspondence": "54",
"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.",
"file": "e",
"fileNumber": 5,
"index0to63": 28,
"isCentre": true,
"isCorner": false,
"isEdge": false,
"longDiagonalLength": 7,
"mirrorLeftRight": "d4",
"mirrorTopBottom": "e5",
"notChecked": [
"pieces on the board",
"other coordinate systems such as numeric correspondence notation"
],
"rank": 4,
"reasons": [
"a1 is dark: a square is light when file number + rank number is odd, counting from a1 = (0,0)."
],
"rotated180": "d5",
"source": "computed locally (board geometry)",
"square": "e4",
"summary": "e4 is a light square (index 28).",
"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": {
"square": {
"description": "A square such as e4 (file a-h, rank 1-8)",
"type": "string"
}
},
"required": [
"square"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"antiDiagonalLength": {
"type": [
"null",
"number"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"color": {
"type": [
"null",
"string"
]
},
"correspondence": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"file": {
"type": [
"null",
"string"
]
},
"fileNumber": {
"type": [
"null",
"number"
]
},
"index0to63": {
"type": [
"null",
"number"
]
},
"isCentre": {
"type": [
"boolean",
"null"
]
},
"isCorner": {
"type": [
"boolean",
"null"
]
},
"isEdge": {
"type": [
"boolean",
"null"
]
},
"longDiagonalLength": {
"type": [
"null",
"number"
]
},
"mirrorLeftRight": {
"type": [
"null",
"string"
]
},
"mirrorTopBottom": {
"type": [
"null",
"string"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"rank": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"rotated180": {
"type": [
"null",
"string"
]
},
"source": {
"type": [
"null",
"string"
]
},
"square": {
"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": "2026-11-01T22:42:09.623Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:42:09.448Z"
},
"resource": "https://chess-notation.x402tookit.com/square-info",
"serviceName": "Chess Notation Tools",
"tags": [
"chess",
"square",
"coordinates",
"board"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "File, rank, light or dark colour, 0-63 index, diagonals and mirror squares for a chess square like e4."
}What the leaf hashes
{"body":"50e3803f6eb5bd0fa57627a5509957f41468a97b155c917f37992f529d32139e","id":2202108,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812518533,"prev":null,"subject":"x402_bazaar:https://chess-notation.x402tookit.com/square-info","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).
- 0x9daef4fd2021e73d9fce2dcd9d09f91d3902895e7965eccb55b2f9a602e6cef2
- 0x661d7071b2f7148d37e2e5a70a820e4d1ac20830c357d42310fa506d826d711e
- 0xdc985e71c465018e8b2bb34fa0caecda707b7bae3af067bd6ddf7348511a584d
- 0xb576e7e84fec6fea9ca95e81209fee70cc597d238134a9e1f095270616720a19
- 0x012843d9b66eb296ccc3b67ec8cc0c8de87ef6f330491d4e6d381d25188c4cf4
- 0x52662db71cafa2187cac9a2771c7204f3f86843f29b7a3c46681c5a64a05e927
- 0xf4cbcb0e1b56d4019a87246e48dd5a5b619a07c25bfc0c234a43cf7ee4f361f7
- 0x7a7254b094a4c0015e33dea57b43a2ab9c7adabac2e714350035d7b66795d67d
- 0x4691f5144f24e774e57d377e8a755f27e56f62061443a67ce744758d6e9dbb05
- 0xff9d18d1e1713e1393b19cb7f45fc745366e2d405db762c8d108330156a09d4d
- 0x54a13335b33b794a226b93c2e5fe9ca894d919b8c8f1b3f2a39a57bd2456fd19
- 0xe76812bd40e4cc597f49a99c25abfeed399db07d379b5ddc3f78d59b5a7e5ed3
- 0x13372d9573063408d81df51991faad9353f3d2ff284b3f6343d434448850fec0
- 0xdff61622855886d80ecda4fb808422c854d0801605b73184332cf83604a730ff
- 0x9c91ecb84461aa4cb2a891252746755d862a88fe9bad822700cdb99eaab2edca
- 0x7731256c7406f95d30aabe3bbcb574b72535b9c28e8eb3db363210761a28a6b9
- 0x07ad80c0c234ecea379a2f4450dfd0804db049dbc62abe77af6306049ca6b6c2
- 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af