Evidence row 259073

What was observed

{
  "count": 1,
  "tools": [
    {
      "description": "ReturnCheck verifies which return policy actually applies to this purchase. BEST RESULTS: send the product page you already have as page_text (or page_html) along with product_url — your browser renders JavaScript and is not blocked by retailers, so this works on any store and is faster. Without it we fetch the page ourselves and reach the policy for about 1 in 3 US retailers (17 of 50 measured 2026-08-28; mostly Shopify and direct-to-consumer brands — large retailers and marketplaces block server-side reads). You get a verified verdict — YES / YES_WITH_CONDITIONS / NO / UNKNOWN — with the exact policy clause quoted verbatim, source URL, return window/deadline, fees and a confidence score. Never invents: returns UNKNOWN instead of guessing, and UNKNOWN is free.",
      "inputSchema": {
        "properties": {
          "buyer_country": {
            "description": "ISO 3166-1 alpha-2, e.g. 'US'.",
            "type": "string"
          },
          "delivery_date": {
            "description": "YYYY-MM-DD (optional; preferred for the deadline).",
            "type": "string"
          },
          "item_condition": {
            "enum": [
              "unopened",
              "opened",
              "used",
              "defective"
            ],
            "type": "string"
          },
          "merchant": {
            "type": "string"
          },
          "page_html": {
            "description": "RECOMMENDED (alternative to page_text). Raw HTML of the same page. Slightly better than page_text: we can also read structured data (JSON-LD) from it.",
            "type": "string"
          },
          "page_source_url": {
            "description": "URL of the supplied page_text/page_html when different from product_url. Caller-declared provenance; not independently fetched.",
            "type": "string"
          },
          "page_text": {
            "description": "RECOMMENDED. Plain text of the product or returns page you already have open. We verify against this instead of fetching: works on any store, no blocking, no JavaScript problem, and faster. Still never invents: no verifiable clause -> UNKNOWN (free).",
            "type": "string"
          },
          "payment_signature": {
            "description": "OPTIONAL. x402 payment authorization, base64 — the same envelope the PAYMENT-SIGNATURE header carries over HTTP. Use it to pay per call with no account and no signup. How: call once without it; if the free trial is exhausted you get the payment terms in structuredContent (x402Version, accepts[]); sign that authorization and call again with payment_signature set. Terms are also published at /.well-known/x402. UNKNOWN verdicts are never settled: the authorization simply expires unused.",
            "type": "string"
          },
          "product_url": {
            "description": "The product page URL (http/https).",
            "type": "string"
          },
          "purchase_date": {
            "description": "YYYY-MM-DD (optional).",
            "type": "string"
          },
          "reason": {
            "enum": [
              "changed_mind",
              "defective",
              "wrong_size_or_model",
              "arrived_late",
              "other"
            ],
            "type": "string"
          },
          "seller_name": {
            "type": "string"
          }
        },
        "required": [
          "product_url",
          "buyer_country"
        ],
        "type": "object"
      },
      "name": "check_return"
    }
  ]
}

What the leaf hashes

{"body":"12c0486b740cb5c0ccee1694a2ed84f57f1f557bc21fa8dade469223537586bb","id":259073,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793030607267397,"prev":null,"subject":"c8311c8c-47ff-4232-9ee7-564ba561b711","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-26 (296695 rows).

1. 0x2d9ceea8bde810502c67f50e830352df74b9e11b0b755b54845fb7446fd730d0
2. 0x63a6e74ed952f1531264775c8bfe09fcd4055ebc0c24fdd6c356eb0f5c295150
3. 0x08ace3de0d92cbcf27a1d9f89b607ba25eccac3978efbb1b74044546ed424a00
4. 0x47ed83ad1ffb6a0c301c040c5cbf65592f7d33d3b4a65e083189bb0327fadb84
5. 0xb3eb54e774bb5de11121efe2d3c272c94cfe67ee9189278c46cc7e702c87e932
6. 0xf7851da7365761d17329c3a5b3d2c7b0b114b99048cce1b711ed7be87afdf454
7. 0xc1807a20380a5cc6e6331bf36a3a61fca4c4aa26f061a68c0c2c3616ad59bc92
8. 0x8498625021a27de3400f88065f86653480c5305c51e6386790a92b8d0cc94b86
9. 0xe76deb2eca22e53c8cabed975a1c5640eaa41ef8ba40a91b5033439c183e013f
10. 0xfebc7a0b0bf8746a2821ac5da36e68a391f5528503546c156de64dcfb3f4e54e
11. 0x0a14d7531a251f3320f61b058ccd68e743331eaf8f3058982b949d68be76670c
12. 0xf89d9951e0a8e08b9cf11177a1f4e0fd86d9facc5dfecaabbfe564675ebefef7
13. 0xb87e8b32cda179c9e632e227bbd8a6d1f6f61d9d81bb92dbd4dd835d2b3b5caa
14. 0x683955a5b2250ad50568d022a6580d8739b6aff1356779d72a773b088e7c289c
15. 0x610738e0c43687aded83c613c73de8b5226c73c375858a167436461c522ea213
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae