Evidence row 525905

What was observed

{
  "endpoints": [
    [
      "x402",
      "https://chess402.vercel.app/api/cloud-eval"
    ],
    [
      "x402",
      "https://chess402.vercel.app/api/masters"
    ],
    [
      "x402",
      "https://chess402.vercel.app/api/puzzle/daily"
    ],
    [
      "x402",
      "https://chess402.vercel.app/api/user"
    ]
  ],
  "name": "chess402.vercel.app",
  "owner_address": null,
  "raw": {
    "caip2_networks": [
      "eip155:8453"
    ],
    "category": "",
    "description": "",
    "domain": "chess402.vercel.app",
    "endpoints": [
      {
        "description": "Stockfish cloud evaluation for a FEN position. Returns depth, evaluation, and principal variation(s) when Lichess has the position cached.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
            "group": "body",
            "name": "fen",
            "required": false,
            "type": "string"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 1,
            "group": "body",
            "name": "multiPv",
            "required": false,
            "type": "number"
          }
        ],
        "pricing": {
          "amount": "0.005",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "5",
          "l30DaysUniquePayers": "4"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/cloud-eval"
      },
      {
        "description": "Masters opening explorer for a position. Returns top moves, win/draw/loss rates, and recent top master games from the Lichess masters database.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
            "group": "body",
            "name": "fen",
            "required": false,
            "type": "string"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 12,
            "group": "body",
            "name": "moves",
            "required": false,
            "type": "number"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "e2e4,e7e5",
            "group": "body",
            "name": "play",
            "required": false,
            "type": "string"
          },
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": 4,
            "group": "body",
            "name": "topGames",
            "required": false,
            "type": "number"
          }
        ],
        "pricing": {
          "amount": "0.003",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "4",
          "l30DaysUniquePayers": "4"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/masters"
      },
      {
        "description": "Today's Lichess daily puzzle: source game, themes, initial position, solution moves, and rating.",
        "method": "POST",
        "parameters": [],
        "pricing": {
          "amount": "0.001",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "7",
          "l30DaysUniquePayers": "6"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/puzzle/daily"
      },
      {
        "description": "Lichess user profile snapshot: ratings per perf, country, title, online status, counts.",
        "method": "POST",
        "parameters": [
          {
            "default": null,
            "description": "",
            "enumValues": [],
            "example": "DrNykterstein",
            "group": "body",
            "name": "username",
            "required": false,
            "type": "string"
          }
        ],
        "pricing": {
          "amount": "0.001",
          "currency": "USDC",
          "maxAmount": "",
          "minAmount": "",
          "network": "eip155:8453",
          "scheme": "exact"
        },
        "providerName": "",
        "quality": {
          "l30DaysTotalCalls": "7",
          "l30DaysUniquePayers": "4"
        },
        "serviceName": "",
        "tags": [],
        "url": "https://chess402.vercel.app/api/user"
      }
    ],
    "enriched": false,
    "iconUrl": "",
    "id": "chess402-vercel-app",
    "integrationType": "",
    "isNew": false,
    "name": "chess402.vercel.app",
    "networks": [
      "Base"
    ],
    "priceSummary": {
      "avgCostBasis": "exact",
      "avgCostPerTransaction": "0.0025",
      "currency": "USDC",
      "maxAmount": "0.005",
      "minAmount": "0.001"
    },
    "provider": "chess402.vercel.app",
    "providerUrl": "",
    "serviceName": "",
    "tags": []
  },
  "source": "agentic_market",
  "summary": ""
}

What the leaf hashes

{"body":"83a5f256cf5e1d249c477b2c0b1e4917976d6fe184558ad211d599eee6785500","id":525905,"kind":"listing","method":"sync.agentic_market/1","observed_us":1793124769861414,"prev":1854,"subject":"agentic_market:chess402-vercel-app","subject_kind":"source_record"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-27 (273461 rows).

1. 0x75036ab2c787fcf74c6442302a07f9592ca53d2450df76081351165b105fa86c
2. 0x02a348cccb8b67385397713ebb96d4681f8f612138a7b555b25ebc7428e8ae32
3. 0xab8cfb70ba71305f0ad685e5441f4c7a6cdd8b26da407f025c916610f82cc56f
4. 0xc471ccfffc5935718decc15cc4c0f6a08f8c0981f8b3a7cf7292eeb9f9b126d4
5. 0x214a03330e432d71f9dbe54e9d76f060842343b7018d34029c3903d49827d5f9
6. 0x0a74a997146e70d871ebaf7229d0cb57c05b8d1bbfac973bf7bd7ccf1840aaec
7. 0xa544fe44b97cfd8cb74b8c96f1223fc291167c77cccf342b51dde9e9833f1764
8. 0x073551750a392615ef3cea9d427e2e6a91082958851e1bd8b9415d2cf34ebe9e
9. 0xba7de18e3db1800578378224c00ca26d423b0f97dd49933e4ee71497ec6ad08e
10. 0x5c556491116c854e5d6a098ecf659f83d1609c9931538e01910eedcdf5460968
11. 0xbadb694e30e3b4990c80e04bb35fb64efec74cc8e401fd0ef8cb0e7b20c88505
12. 0x58a1b7d7965722efb70d69acfb10b39e77f817864b8d4b4069d33ff29884a3bd
13. 0x4094bd5bc2ab60e4518d1ee8a13455a69d7484ea62ecdca2618d0f39d3403503
14. 0x9848c068b1371232529d2b5738fdc45b854c57da041b69ea7c9e112b14e2d9d1
15. 0x275720ecabb68df33eee92ae4fd70572a8d952d6c61c061c2869cfc3217aa5c5
16. 0x23cf9bb4337ee8be7fcae368fd69d24c62c11fb45882127b4cd919bb96a19996
17. 0x0e01aa9525097570a6edaf32bfc959de57bf5c24317cf10c0716affea85ca60d
18. 0xa20d48798a34aba12eb9c7297722982d910f06c148f5e27ac59307422964a585
19. 0x9fc354c0ea3efc3f1b6548bb77ea902a50f2c9647647ea61592efce2bd795699

Day root

0xdd77e5e99da32c3f154180d63e3c3e6fe11e896a2c6896412ef6b5c4bcf7e795

Chained

0x23bb4dfd09f55c15ac3962f53578e02c6114d5bfd9bb451cf8794fb6e2817ef4

Published

On Arc Testnet, block 69414147: 0xb2ebd83aafeb765a0ce66e76aefb133ed06606c98038fd56191e2bcd1dcb77b4