← The evidence ledger
Evidence row 2201488
Observed , by sync.x402_bazaar/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://paper-print-calc.x402tookit.com/book-signatures
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 58e1c685b94e00c4a9b629ac8dbfb6f71eeefc544fc5ffa15f710eadb88d0cb4
- Leaf
- 0xd4f5acbbcea53bd544d6b5849548a4570061f0bac3384a6725d5bb1f2adbecdd
What was observed
{
"endpoints": [
[
"x402",
"https://paper-print-calc.x402tookit.com/book-signatures"
]
],
"name": "Paper & Print Calc",
"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": "Signatures, press sheets and blank pages needed for a book of N pages at 4, 8, 16 or 32 pages per signature.",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"pages": 100,
"pagesPerSignature": 16
},
"type": "http"
},
"output": {
"example": {
"alternatives": [
{
"blankPages": 0,
"pagesPerSignature": 4,
"signatures": 25
},
{
"blankPages": 4,
"pagesPerSignature": 8,
"signatures": 13
}
],
"asOf": "2026-10-12T01:48:13.893Z",
"blankPages": 12,
"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.",
"leaves": 56,
"notChecked": [
"mixed signature sizes (many books finish with a smaller signature, such as an 8 or 4, instead of blanks)",
"paper grain direction and the imposition scheme of your press",
"…1 more"
],
"pages": 100,
"pagesPerSignature": 16,
"reasons": [
"A folded sheet gives a signature of 16 pages; the last signature is padded with blanks (or replaced by a smaller one)."
],
"sheetsAllCopies": 28,
"sheetsNoteBothSides": "A sheet printed on both sides makes 4 pages.",
"sheetsPerCopy": 28,
"signatures": 7,
"source": "computed locally (folding arithmetic)",
"spineThicknessNote": "Count sheets x paper caliper for spine width.",
"summary": "100 pages in 7 signature(s) of 16 = 112 pages, 12 blank page(s).",
"totalPages": 112,
"verdict": "BLANKS_NEEDED"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"copies": {
"description": "Copies, for total sheets (default 1)",
"type": "integer"
},
"pages": {
"description": "Printed page count (a leaf is two pages), 1 to 5000",
"type": "integer"
},
"pagesPerSignature": {
"description": "4, 8, 16 (default) or 32 pages per signature",
"type": "integer"
}
},
"required": [
"pages"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"alternatives": {
"items": {
"properties": {
"blankPages": {
"type": [
"null",
"number"
]
},
"pagesPerSignature": {
"type": [
"null",
"number"
]
},
"signatures": {
"type": [
"null",
"number"
]
}
},
"type": "object"
},
"type": [
"array",
"null"
]
},
"asOf": {
"type": [
"null",
"string"
]
},
"blankPages": {
"type": [
"null",
"number"
]
},
"degraded": {
"type": [
"boolean",
"null"
]
},
"disclaimer": {
"type": [
"null",
"string"
]
},
"leaves": {
"type": [
"null",
"number"
]
},
"notChecked": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"pages": {
"type": [
"null",
"number"
]
},
"pagesPerSignature": {
"type": [
"null",
"number"
]
},
"reasons": {
"items": {
"type": "string"
},
"type": [
"array",
"null"
]
},
"sheetsAllCopies": {
"type": [
"null",
"number"
]
},
"sheetsNoteBothSides": {
"type": [
"null",
"string"
]
},
"sheetsPerCopy": {
"type": [
"null",
"number"
]
},
"signatures": {
"type": [
"null",
"number"
]
},
"source": {
"type": [
"null",
"string"
]
},
"spineThicknessNote": {
"type": [
"null",
"string"
]
},
"summary": {
"type": [
"null",
"string"
]
},
"totalPages": {
"type": [
"null",
"number"
]
},
"verdict": {
"type": [
"null",
"string"
]
}
},
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"lastUpdated": "2026-11-01T23:42:35.393Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-11-01T23:42:35.131Z"
},
"resource": "https://paper-print-calc.x402tookit.com/book-signatures",
"serviceName": "Paper & Print Calc",
"tags": [
"bookbinding",
"signatures",
"page-count",
"printing"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Signatures, press sheets and blank pages needed for a book of N pages at 4, 8, 16 or 32 pages per signature."
}What the leaf hashes
{"body":"58e1c685b94e00c4a9b629ac8dbfb6f71eeefc544fc5ffa15f710eadb88d0cb4","id":2201488,"kind":"listing","method":"sync.x402_bazaar/1","observed_us":1793646805696715,"prev":null,"subject":"x402_bazaar:https://paper-print-calc.x402tookit.com/book-signatures","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).
- 0xd4f5bfdea09c9df2c8b1981fd99f2cb87c9d7e6c83d10fd19c9acf2fb8221482
- 0xed92fc4d778c7ea3d626c9713207915f3ac67ab06ff5b49838c1e602796d79d7
- 0xc5b2238338675c799ec9e1a0d44558542a8f338cf3268166dcb38ea0ea32bc8c
- 0xefdb7b3e07c443b6c4734bc301dde9acfd0e46d224a2f22856314d371055c6e0
- 0x3e86df276a87e2d0106e18f6ccf6893856029a5b73879bfa22a66d86ebc2126f
- 0x04fd1f04d4983882f865977e9f5be7e5309ecf7d685dfbc093cc2328048c55ed
- 0x9ca308b30ff759400f71deb7e13654764480c2a5d16f25d30613fa6ce1c94f4f
- 0xc1d30cd95ed05af4f41083c2c3860af44582e94745b4107afaa781b2a0a7aa50
- 0xe1a6cf81988976706bf6af06d4fc5595946b240279156764334beb0cd81a719e
- 0x213d6deae3bd6f24f9cbf0df306f4f8d2bb372dbd1fd50bbd324beb7594510fa
- 0x7e19235bd70c24fa68e19d9c6b2a5552d51c8ca377bd6ad549d6fc2ebb9030ad
- 0x072692234554b97382d37c92218486722ec2bf70517ce099e4442459f16a2b2b
- 0x6a9bee5282acc64846540deef79ef327521ab20b00328c4b297bc96a5b4036c5
- 0xc94ac971f2e2765086823b6227f70a7d3fdcf267884d07ae0a3f85c1caf941d2
- 0xa9134f4ed9cec34e13ba243b6a51db73753dbbb3b48c63bd82b22694813d2b02
- 0x7ddefa7d79e7640c3fed21ee4472689415182c41a0258ab04a81d60495f4c40a
- 0xdb8bd933619a267f9790faac9839143d202be46af284371cc369cdf683f897ba
- 0x98cbbf2c68ab4c0b4db782aeb88bea1f30b02178cf8b5d3d24a931d19492ea6d
- 0x252cce55f1a3d5391c16f82d7f62494429a5f69b03486d4cfcfb7b2c96d6c884
- Day root
- 0x78fecaabbe319e56f5c4b80fc02e2052e198ad24781da8832a475ff65f2002d1
- Chained
- 0xdc35957db5d1371ca382b9152878ffece28ec7c5cb4f98fd71ddb367f8b999b2
- Published
- On Arc Testnet, block 70432815: 0x56b814612eb2e3e544153df3e91e1f7199106d1e430c7d8c6b653feeb9ebe9af