← The evidence ledger
Evidence row 120379
Observed , by baseline/1.
- Kind
- listing
- About
- source_record x402_bazaar:https://saylorinnovations.com/api/library/loc
- Recorded
- Previous row
- None: the first of its kind about this subject
- Body SHA-256
- 0fe0388eef623686689687bd9c7435660cafa8c88675317863f93da7fe14a4eb
- Leaf
- 0x153e3437bf6663f9b2b66305bb6c0e12015edeb81c99fe0a6fe909771e965459
What was observed
{
"endpoints": [
[
"x402",
"https://saylorinnovations.com/api/library/loc"
]
],
"name": "Saylor Innovations Data Desk",
"owner_address": "0xa2a8df0f7caabea4e120a2568118f141569fc8aa",
"raw": {
"accepts": [
{
"amount": "10000",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:loc-search",
"name": "USD Coin",
"note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:8453",
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:loc-search",
"name": "USD Coin",
"note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:137",
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
"extra": {
"assetTransferMethod": "eip3009",
"facilitatorOnly": true,
"memo": "saylor:datadesk:loc-search",
"name": "USD Coin",
"note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
"version": "2"
},
"maxTimeoutSeconds": 120,
"network": "eip155:42161",
"payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"memo": "saylor:datadesk:loc-search",
"reference": "FXvGkYtsR6hPb4uckk9SgmZQf2XNsC92mRijbqqLwxkW",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpsb2Mtc2VhcmNoIiwicmVmZXJlbmNlIjoiRlh2R2tZdHNSNmhQYjR1Y2trOVNnbVpRZjJYTnNDOTJtUmlqYnFxTHd4a1ciLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFUGpGV2RkNUF1ZnFTU3FlTTJxTjF4enliYXBDOEc0d0VHR2tad3lURHQxdiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MjQwOTAyODI0OH0.-hbTIZl_lliGIMS-b5bK0ftfPLCau8rHJ14_JfX6Xng"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "10000",
"asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
"extra": {
"feePayer": "D6ZhtNQ5nT9ZnTHUbqXZsTx5MH2rPFiBBggX4hY1WePM",
"memo": "saylor:datadesk:loc-search",
"reference": "6YiqKwckTwFdMpkG1hget3mUy1XXYUephUo7JvS9wciE",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpsb2Mtc2VhcmNoIiwicmVmZXJlbmNlIjoiNllpcUt3Y2tUd0ZkTXBrRzFoZ2V0M21VeTFYWFlVZXBoVW83SnZTOXdjaUUiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOiJFczl2TUZyemFDRVJtSmZyRjRIMkZZRDRLQ29Oa1kxMU1jQ2U4QmVud05ZQiIsIm1pbkFtb3VudCI6MTAwMDAsImV4cCI6MTc5MjQwOTAyODI0OX0.Hqj5fRNWGlGW-LCz2_caYJmcv-_qy8pqsra2QVGN22U"
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
},
{
"amount": "92830",
"asset": "So11111111111111111111111111111111111111112",
"extra": {
"memo": "saylor:datadesk:loc-search",
"native": true,
"note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
"quotedLamports": "95702",
"reference": "7WMWd7uoEzhdPsro85pbZj49Vm6fYPNhwGJmgQsyF7T2",
"session": "eyJhcnRpY2xlSWQiOiJkYXRhZGVzazpsb2Mtc2VhcmNoIiwicmVmZXJlbmNlIjoiN1dNV2Q3dW9FemhkUHNybzg1cGJaajQ5Vm02ZllQTmh3R0ptZ1FzeUY3VDIiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOm51bGwsIm1pbkFtb3VudCI6OTI4MzAsImV4cCI6MTc5MjQwOTAyODI4NX0.NioDCG0NcJWsiJY-V476pQAO8yJx_ptUKhPC2ZoNPBs",
"solUsdPrice": 104.49
},
"maxTimeoutSeconds": 120,
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
"scheme": "exact"
}
],
"description": "Search the Library of Congress digital collections - title, date, format, contributors, subjects, description, image and link for books, maps and photos",
"extensions": {
"bazaar": {
"info": {
"input": {
"method": "GET",
"queryParams": {
"limit": "5",
"q": "lincoln"
},
"type": "http"
},
"output": {
"example": {
"count": 5,
"items": [
{
"contributors": [
"lincoln, abraham"
],
"date": null,
"description": "The papers of Abraham Lincoln (1809-1865), lawyer, representative from Illinois, and sixteenth president of the United States, contain approximately 40,550 documents dating from 1774 to 1948, althoug…",
"format": [
"collection",
"manuscript/mixed material"
],
"image_url": "https://www.loc.gov/static/collections/abraham-lincoln-papers/500_500.jpg",
"location": [
"illinois",
"united states"
],
"subjects": [
"the presidency and the executive branch",
"abraham lincoln",
"national expansion and reform"
],
"title": "Abraham Lincoln Papers at the Library of Congress",
"url": "http://www.loc.gov/collections/abraham-lincoln-papers/about-this-collection/"
},
{
"contributors": [
"stern, alfred whital",
"alfred whital stern collection of lincolniana (library of congress)",
"library of congress"
],
"date": "1824",
"description": "The collection contains more than 11,100 items. This online release presents more than 1,300 items with more than 4,000 images and a date range of 1824-1931. It includes the complete collection of St…",
"format": [
"collection",
"book",
"photo, print, drawing"
],
"image_url": "https://www.loc.gov/static/collections/alfred-whital-stern-lincolniana/500_500.jpg",
"location": [
"united states"
],
"subjects": [
"personal correspondence",
"abraham lincoln",
"national expansion and reform"
],
"title": "The Alfred Whital Stern Collection of Lincolniana",
"url": "http://www.loc.gov/collections/alfred-whital-stern-lincolniana/about-this-collection/"
},
{
"contributors": [
"herndon, william henry",
"weik, jesse william",
"lincoln, abraham"
],
"date": null,
"description": "The Herndon-Weik Collection of Lincolniana consists of 4,600 items (9,729 images), most of which were digitized from 15 reels of previously produced microfilm. Spanning the years circa 1824-1933, the…",
"format": [
"collection",
"manuscript/mixed material"
],
"image_url": "https://www.loc.gov/static/collections/herndon-weik-collection-of-lincolniana/500_500.jpg",
"location": [
"illinois",
"springfield"
],
"subjects": [
"personal correspondence",
"biographies",
"abraham lincoln"
],
"title": "Herndon-Weik Collection of Lincolniana",
"url": "http://www.loc.gov/collections/herndon-weik-collection-of-lincolniana/about-this-collection/"
}
],
"note": "Digitised books, maps, photographs, manuscripts and recordings across Library of Congress collections.",
"query": "lincoln",
"source": "Library of Congress",
"total": 339616
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"properties": {
"limit": {
"description": "optional 1-20, default 8",
"type": "string"
},
"q": {
"description": "Search terms",
"type": "string"
}
},
"required": [
"q"
],
"type": "object"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"count": {
"description": "Number of items returned",
"type": "number"
},
"items": {
"description": "List of items",
"items": {
"properties": {
"contributors": {
"description": "Creators and contributors",
"type": [
"array",
"null"
]
},
"date": {
"description": "Date (YYYY-MM-DD)"
},
"description": {
"description": "Short description"
},
"format": {
"description": "Format of the result"
},
"image_url": {
"description": "Image URL"
},
"location": {
"description": "Place the data refers to"
},
"subjects": {
"description": "Subject headings",
"type": [
"array",
"null"
]
},
"title": {
"description": "Title"
},
"url": {
"description": "Canonical URL"
}
},
"type": "object"
},
"type": "array"
},
"note": {
"description": "Caveat or context for reading the result",
"type": "string"
},
"query": {
"description": "The query as the server interpreted it",
"type": "string"
},
"source": {
"description": "Data source the values come from",
"type": "string"
},
"total": {
"description": "Total number of matching items",
"type": "number"
}
},
"required": [
"query",
"items"
],
"type": "object"
},
"type": {
"const": "json",
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
},
"iconUrl": "https://res.cloudinary.com/bdb-prod/image/upload/c_fill,ar_1:1,w_256,h_256,f_auto,q_auto/v1791811517/bazaar-icons/bc5e2b3d111ebbef.jpg",
"lastUpdated": "2026-10-19T11:21:48.332Z",
"quality": {
"l30DaysTotalCalls": 2,
"l30DaysUniquePayers": 2,
"lastCalledAt": "2026-10-19T11:21:48.035Z"
},
"resource": "https://saylorinnovations.com/api/library/loc",
"serviceName": "Saylor Innovations Data Desk",
"tags": [
"library of congress search",
"historic photographs about",
"public domain maps",
"digitized archive items by topic",
"find primary sources loc"
],
"type": "http",
"x402Version": 2
},
"source": "x402_bazaar",
"summary": "Search the Library of Congress digital collections - title, date, format, contributors, subjects, description, image and link for books, maps and photos"
}What the leaf hashes
{"body":"0fe0388eef623686689687bd9c7435660cafa8c88675317863f93da7fe14a4eb","id":120379,"kind":"listing","method":"baseline/1","observed_us":1793025617971740,"prev":null,"subject":"x402_bazaar:https://saylorinnovations.com/api/library/loc","subject_kind":"source_record"}Proof
Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of (296695 rows).
- 0x153e77b42f1375d72189bef192f347fa2e79627c9934da6522a7e424f87a3bb7
- 0xbbccebed9208c45514eb3b7cad3a1d0bed8fde6462c45166793611752250a336
- 0xd9a72393385bb7951c46e46abe55cf928b6883ca25e4b5da31e86ac1bb9c7dd6
- 0x098fa92651eb4d1e79e872856e5b6e780d8f2e37dfb93a729584284afe9a08ee
- 0x8d4ff33f76a3284fbd0672d37e9ca11819273577acc33b6e8decbf1877a692df
- 0x82509c4f6093dcda14072884ecc51bbd56706a384ddd4d6b03f23676417fbc5c
- 0x747964725a91e93da2b0a3c19efbee8fac6bf5ac8cebb3945e84d1fa74639d68
- 0x2c6cc560d345892e5d0f5970ab46061632d261b3db26b019479a6e2f3d077c3f
- 0x26be3c07ca6019e56c6581d9b3bded992ed6363c7bd89362751cf2296be0412d
- 0x62971446cc50312a1295d5bf772913e17639cbd732dd41883c8dea522d4637e8
- 0xb5d5212c69fb335bad2409aa4a0da0469cc6cc62939ca82d5235005f3b154a2b
- 0x2412cb8bc4d10d94e1eb907d5058dd12133e55416609e1b314e811af76620542
- 0xff1c28bdf595a3d1333e9915edc68e9c5fded7bd5923fa85870979af34cbc3b3
- 0xb49e8c2564256e5322e375cb619d9ac70fd17c1d1eba9c991bba4cb6428f45cc
- 0x60582ab4b41e72eb70eb0bce07fbf0fb4d2b62a8bad5be50f5d16d511adc746c
- 0xc6a4d7899a0f442958e26505011190b7cff2483611c1b94eba9043e0ba9ac36e
- 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
- 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
- 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a
- Day root
- 0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8
- Chained
- 0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a
- Published
- On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae