Evidence row 295536

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Returns the licence (CC BY 4.0) and credit form, what is not served, the store setting, the published index weeks and the basket date range with its short and missing days. Use it before citing or relying on the other tools.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {},
        "type": "object"
      },
      "name": "about_the_data"
    },
    {
      "description": "Returns one published week of the free UK or Australian online shelf-price index (CC BY 4.0): index levels, week-on-week change and matched-product counts by retailer and product class. Use it for \"how did posted grocery shelf prices move this week\". Not a CPI, not prices paid, no product names. Omit vintage for the latest week; call list_index_vintages for the others.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "class": {
            "description": "Only rows for this product class id, e.g. \"dairy-eggs\".",
            "pattern": "^[a-z-]{2,40}$",
            "type": "string"
          },
          "market": {
            "description": "uk or au. Example: \"uk\".",
            "enum": [
              "uk",
              "au"
            ],
            "type": "string"
          },
          "recordType": {
            "description": "Only rows of this kind, e.g. \"headline\". Omit for all rows.",
            "enum": [
              "headline",
              "retailer",
              "class",
              "retailer_class",
              "retailer_like_for_like",
              "subtotal",
              "retailer_subtotal"
            ],
            "type": "string"
          },
          "retailer": {
            "description": "Only rows for this retailer id, e.g. \"tesco\" (UK) or \"aldi_au\" (AU).",
            "enum": [
              "tesco",
              "sainsburys",
              "asda",
              "aldi",
              "coles",
              "woolworths",
              "aldi_au"
            ],
            "type": "string"
          },
          "vintage": {
            "description": "ISO week, e.g. \"2026-W42\". Omit for the latest published week.",
            "pattern": "^[0-9]{4}-W[0-9]{2}$",
            "type": "string"
          }
        },
        "required": [
          "market"
        ],
        "type": "object"
      },
      "name": "get_shelf_price_index"
    },
    {
      "description": "Returns the published weeks (vintages) of the free UK or Australian online shelf-price index, newest first, with publication time, revision and base week. Use it before get_shelf_price_index to pick a week. Not for prices.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "market": {
            "description": "uk or au. Example: \"au\".",
            "enum": [
              "uk",
              "au"
            ],
            "type": "string"
          }
        },
        "required": [
          "market"
        ],
        "type": "object"
      },
      "name": "list_index_vintages"
    },
    {
      "description": "Returns posted shelf prices from the free UK daily 212-item basket (CC BY 4.0) for up to 20 barcodes (EAN) or retailer product ids, up to one row per retailer for one day: price, was-price, loyalty price, unit price, pack size and stock. Use it for \"what did this barcode cost at Tesco, Sainsbury's, Asda or Aldi on a day\". Each result row lists its barcodes in `ean`. Static snapshot days, not live. Not for searching by product name; only the 212 basket products are covered.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "date": {
            "description": "Day, e.g. \"2026-10-08\". Omit for the latest day loaded.",
            "pattern": "^[0-9]{4}-[0-9]{2}-[0-9]{2}$",
            "type": "string"
          },
          "eans": {
            "description": "Barcodes, 8, 12, 13 or 14 digits, e.g. [\"5000157024671\"]. Give eans, products or both.",
            "items": {
              "pattern": "^[0-9]{8}$|^[0-9]{12,14}$",
              "type": "string"
            },
            "maxItems": 20,
            "minItems": 1,
            "type": "array"
          },
          "products": {
            "description": "Retailer product ids, e.g. [{\"retailer\": \"tesco\", \"retailerProductId\": \"254656543\"}].",
            "items": {
              "additionalProperties": false,
              "properties": {
                "retailer": {
                  "enum": [
                    "tesco",
                    "sainsburys",
                    "asda",
                    "aldi"
                  ],
                  "type": "string"
                },
                "retailerProductId": {
                  "pattern": "^[A-Za-z0-9._-]{1,128}$",
                  "type": "string"
                }
              },
              "required": [
                "retailer",
                "retailerProductId"
              ],
              "type": "object"
            },
            "maxItems": 20,
            "minItems": 1,
            "type": "array"
          },
          "retailers": {
            "description": "Only these retailers, e.g. [\"tesco\", \"asda\"]. Omit for all four. The basket holds no barcodes for Aldi: use products for Aldi.",
            "items": {
              "enum": [
                "tesco",
                "sainsburys",
                "asda",
                "aldi"
              ],
              "type": "string"
            },
            "minItems": 1,
            "type": "array",
            "uniqueItems": true
          }
        },
        "type": "object"
      },
      "name": "lookup_basket_prices"
    }
  ]
}

What the leaf hashes

{"body":"bdd57e35aa0f265108724ceaf38c1327d6e24da866aa50c9e8cfd1922f770fcc","id":295536,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793051013640625,"prev":null,"subject":"324d94ce-58fd-47af-b585-d8cc394eaf4f","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. 0x4c5b740315ad1a0a11510dbbad65bf68671038aae06021de556de249e8c69d20
2. 0xce8bd844fadd341e4dae04037c1c7eb32e355540883c72a7d76501c5a18f1e72
3. 0x154f2be8015b8464a03d8e4a01d0436fa1b6da421f2fe10d7ca7dfeddb4c8774
4. 0x00938f519080b2f4450a74a1ddd73289a447884474a6cbd13868c7288aa06b18
5. 0x64ec5a17b74a30b2e8ca207d1efd21e98593180f0dc9e22b5b2cc465b7cf432c
6. 0x0ec7ea9802c39f809a9e68bb2b9626ce6fde26f3d445048acc21e272b01a9d8a
7. 0xae3f934bc7d809a52834f15f2db3e2255b8a6471dc5997c195648dced333e067
8. 0x1dd275447a5c7f759f1cba62af7df62145553bdfb3305a6404c5df5ba907fe6e
9. 0x43acfb53889a6d9820160fa6df89020891c2b8a2d97e451de1e0ff28ba46d20a
10. 0x32dd5960bea005a040bbd1369f1894182fe94230e0a86fab637abe9785a5b0d9
11. 0x4a13cd2655a1d8b39528cfa63482483519544a5eb593623bd8ca3eb463e263b6
12. 0x9c16024747eaca32d09963ccb001059f75dcd9bb8dfc221e5234d54d2b3388d9
13. 0x1ffd24a0422348bb2305058cc138e276511e1c074bf8139af5b773941f0e5de2
14. 0x88e326a39b26e2c125306c9d3805d14398ace088bba9a2a0aa376b811cfb201a
15. 0x2be1e80e065dd6b2cc75a7142be22225acd144ac975d70bf24b4f01fd76dc497
16. 0x2e6a32eb32761c210560e852405e2f865f958ddbe01027894f8b9c1b3433b9f0
17. 0x9a83be955a206deb65b995adfd92c58fa31c95fbbf926bd199d300e70b08b26d
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae