← The evidence ledger
Evidence row 2202111
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://chess-notation.x402tookit.com/pgn-headers
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 42f78e468524a0d0c036527a124e97aab2e9364386a29162ba1fdc0302b70066
- Leaf
- 0x1efd252afef5b1e61fc419d6bb344b39dae3c72bda0f755aa474928956701998
What was observed
{
"endpoints": [
[
"x402",
"https://chess-notation.x402tookit.com/pgn-headers"
]
],
"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": "Parse PGN tag pairs, check the Seven Tag Roster, result token and date format, and count the moves in the movetext.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"pgn": "[Event \"Casual game\"]\n[Site \"Paris FRA\"]\n[Date \"1858.??.??\"]\n[Round \"?\"]\n[White \"Paul Morphy\"]\n[Black \"Duke Karl / Count Isouard\"]\n[Result \"1-0\"]\n\n1. e4 e5 2. Nf3 d6 3. d4 Bg4 1-0"
},
"type": "http"
},
"output": {
"example": {
"asOf": "2026-10-12T01:02:03.845Z",
"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.",
"firstMoves": [
"e4",
"e5",
"…4 more"
],
"fullMoves": 3,
"halfMoves": 6,
"missingRosterTags": [],
"notChecked": [
"whether the moves are legal",
"NAGs, variations and comment content",
"…1 more"
],
"reasons": [],
"resultInMovetext": "1-0",
"sevenTagRosterComplete": true,
"source": "computed locally (PGN standard section 8)",
"summary": "7 tag(s), 6 half-move(s) (3 full moves).",
"tagCount": 7,
"tags": {
"Black": "Duke Karl / Count Isouard",
"Date": "1858.??.??",
"Event": "Casual game",
"Result": "1-0",
"Round": "?",
"Site": "Paris FRA",
"White": "Paul Morphy"
},
"verdict": "VALID_TAGS"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"pgn": {
"description": "A PGN game or just its tag-pair header (up to 6000 characters)",
"type": "string"
}
},
"required": [
"pgn"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"asOf": {
"type": [
"null",
"string"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"firstMoves": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"fullMoves": {
"type": [
"null",
"number"
]
},
"halfMoves": {
"type": [
"null",
"number"
]
},
"missingRosterTags": {
"type": [
"array",
"null"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"reasons": {
"type": [
"array",
"null"
]
},
"resultInMovetext": {
"type": [
"null",
"string"
]
},
"sevenTagRosterComplete": {
"type": [
"boolean",
"null"
]
},
"source": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"tagCount": {
"type": [
"null",
"number"
]
},
"tags": {
"properties": {
"Black": {
"type": [
"null",
"string"
]
},
"Date": {
"type": [
"null",
"string"
]
},
"Event": {
"type": [
"null",
"string"
]
},
"Result": {
"type": [
"null",
"string"
]
},
"Round": {
"type": [
"null",
"string"
]
},
"Site": {
"type": [
"null",
"string"
]
},
"White": {
"type": [
"null",
"string"
]
}
},
"type": [
"null",
"object"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T22:42:01.666Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T22:42:01.492Z"
},
"resource": "https://chess-notation.x402tookit.com/pgn-headers",
"serviceName": "Chess Notation Tools",
"tags": [
"chess",
"pgn",
"tags",
"parse"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Parse PGN tag pairs, check the Seven Tag Roster, result token and date format, and count the moves in the movetext."
}What the leaf hashes
{"body":"42f78e468524a0d0c036527a124e97aab2e9364386a29162ba1fdc0302b70066","id":2202111,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646812527225,"prev":null,"subject":"x402_bazaar:https://chess-notation.x402tookit.com/pgn-headers","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).
- 0x1efd2aaf418d3ce07adf47843bb1c76f9522af9ce29c7029b3a01b82daa921ac
- 0x33e82f906efc41b0f059bdec105ce38d6944d07b4742cc7acc510fbdbf7ddff6
- 0x766f4bd3ddd702defb6c155193caae424215afa4d8bfe6b496b4c6da50631a45
- 0x616d694b8b88f7c16684e5a6efedf28184eb7cf73cad0b4556c4d031a0f90029
- 0x5df9fcb06560c421853ec0c17cf80c8a937f3574dad0597b78148e29e97099b4
- 0xc417df10b1acc004b8a10e35c1ce7e07d9ab918a9fd1bcf1a91912b5bc2475c4
- 0x65148b4bf94e3273bb546350f61127442a6a0047794a54578e985ac9aa52fa94
- 0xc3cd158971ee1e997aa15f19e985741354a01c86fd45e8294de3e878c1ee5f1c
- 0x984542fd8e2ad733c446ef39a71a8100b7583bfbc5be15628e3f4fa35f8284ec
- 0x970b44c5ba4a05000a2fbbf81ea4eff11195d8a8e7e3f80276441a024f9d4df1
- 0xac0fc923a0db6bc3966b63b9f80568be71e73b50d1e4f75f4cff6ce1027de1b2
- 0x921d0608297ee8b39f59114be3d8989b8d4efd3e464dd03aef90facc4e2624f6
- 0x350e03a59bf81961fd9ce694f08f9ba0239d9ea2496b0c0dc7998c9e9855326f
- 0xc63937235d47ff2107de3051477e395be67b96d91d1349c787bf4b1ef91b602f
- 0xcd21ec8d72a18a2d4513e4fd309abbb530810fb1dbeecd4b9b85acb4d6ff8f12
- 0xac40f077ca4be8c3432a67771725cc315e8101fc2649999cfad2c900a7640e27
- 0x53a741b69e9e51c4a288a74712aa6ac3fb28c8923cd3e6461d161c4f2d48b31a
- 0x050f2978b537f7afb21ee1551577cdf146d1c56f4df12d24315ae5e69366b0a4
- 0x365b161a4b68d750dcc4b3ecce1154a2163c87b08762079428e68f0ebb6a754e
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af