Evidence row 1051976

What was observed

{
  "count": 3,
  "tools": [
    {
      "description": "Spillmark's method in brief: how a geo holdout test measures the sales Meta ads cause on Amazon, with links to the full method and a sample report on made-up numbers.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "how_lift_is_calculated"
    },
    {
      "description": "Spillmark's free Amazon and Meta ads calculators (holdout test size, brand-size MDE, geo holdout states, ad waste, Meta ROAS reality check, incremental ROAS, break-even ROAS, ACoS, TACoS, Amazon fees and profit, LTV and CAC), with each one's inputs and example values. Use run_calculator to run one.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "q": {
            "description": "Filter by words in the name or summary, e.g. 'holdout' or 'fees'",
            "maxLength": 60,
            "type": "string"
          }
        },
        "type": "object"
      },
      "name": "list_calculators"
    },
    {
      "description": "Runs one calculator from list_calculators on your numbers and returns the headline result, the supporting figures, a one-sentence reading, and a link that opens the calculator with the same inputs. Missing inputs use the calculator's example values. Enter percents as points (15 means 15%), choices as the option index.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {
          "currency": {
            "description": "Currency for money results. Default USD",
            "enum": [
              "USD",
              "EUR",
              "GBP",
              "CAD",
              "AUD"
            ],
            "type": "string"
          },
          "inputs": {
            "additionalProperties": {
              "anyOf": [
                {
                  "type": "number"
                },
                {
                  "maxLength": 32,
                  "type": "string"
                },
                {
                  "type": "null"
                }
              ]
            },
            "description": "Input values by key",
            "propertyNames": {
              "type": "string"
            },
            "type": "object"
          },
          "slug": {
            "description": "Calculator slug from list_calculators, e.g. holdout-test-calculator",
            "maxLength": 80,
            "minLength": 1,
            "type": "string"
          }
        },
        "required": [
          "slug"
        ],
        "type": "object"
      },
      "name": "run_calculator"
    }
  ]
}

What the leaf hashes

{"body":"c97f74c0e217aa8b5b2daa6a844d8e4c0b32124e7f2cbcb1998195bcfd3972dd","id":1051976,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793304262882069,"prev":516870,"subject":"f5716995-3b47-40ab-9582-fefec7058a7a","subject_kind":"endpoint"}

Proof

Fold these into the leaf in order, hashing each sorted pair with keccak256, to reach the root of 2026-10-29 (242798 rows).

1. 0x9a259257489b4abdd55d8563f6fce4ea594277640da9f070dbdd9613b0abbff9
2. 0x45e9815525fef81da6023bac351823afa2fbd4d1e7d9ddb223058a1438fe9f1a
3. 0xc39aca6769ec89b71091a0cd4d5122e7942fddf0a77d38a4cb1b11c8bbbca35c
4. 0x4ca7d56aca245830ba69ea72014dd22586b15d834d5eaac7a0f6894ef61b58f5
5. 0xf67cc9b41fd322101d2b8ba55d7363fbeaf5b1b6c0017dc5e0fe2f758a31920f
6. 0xd03f3c975d4ea74b24f96a2dd4406fad511336708c6c05394f5c59d197257142
7. 0xd0f9546db7222d8b9711ab6276b6dbb62bd3db97c8f54cc9c9427a630a72ba87
8. 0x12498985a3715c5cf760947725d95f5e8ab1ae627e4874a61c2e427d5b54819e
9. 0x60f70d40ce7c7c3329c78b0b24a35ff23182c919a4bcb876f071fb9183345392
10. 0xfa9f8533f7ccbd983bc60cb9b1c856efa6d52c3a9f5a56c2895da3c44a88ee17
11. 0x840f554839b7c3bca2d5e98be959a8bc71c2153f600bbd2309eff7472805da45
12. 0xed8517f31ec0876e21a7e8fe53647529931dc6d3a5973bab25eadd47041a81d1
13. 0xe4afc6a5a9cd7a2bdc01f56793e0f8960d1cce7e17e93d6537f6043b1647f074
14. 0x2b11062f499f97c836e687fbba91202ea7ff254c8f8928d683df655cd117d9ec
15. 0x09d5ec1c01b0f087fe9f6cc95432188552da9adc88004aed57401ea49f2b56d4
16. 0xe38dc587bc010668982bd78025ac33d7326ffc2587f2de00e848da2718907ecf
17. 0xa1fa2e97e71ad6e802f325afd74bb7095901f2060529c9739182a1233f8804bc
18. 0xe01539ac4c9f9cdf265a9e5c6d99c8da11e70ff0c7175fb23e402d33b9d79785

Day root

0xc050555c6b023f2aefb6536efb9f0760b92c30a0d06c572b7daf63db259ea17c

Chained

0x4cde8bae2042512e1bec11650628f0293556311cc4ea74d99ffddf02b671a7d6

Published

On Arc Testnet, block 69753317: 0x9e85c340732f416e431b111fae72f7624870125f7f379af2732eb6c2ba8cf6a1