Evidence row 292715

What was observed

{
  "count": 10,
  "tools": [
    {
      "description": "Report the ECB rate cache here: which dates are held, how old they are and when they refresh. Reads only. Check it before trusting a rate after time offline; a cache that no longer parses is quarantined and named.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "cache_status"
    },
    {
      "description": "Call this tool to convert an amount between any two ECB-quoted currencies, today or on a past date. Returns the converted amount, the cross rate to 6 decimals, the rounding applied and the rate date used.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "amount": {
            "description": "Amount in major units of the from currency, e.g. 100 or 12.34",
            "type": "number"
          },
          "date": {
            "description": "ISO date YYYY-MM-DD. Omit for the latest published rate. A weekend or TARGET holiday falls back to the last rate published on or before it, and the answer says so. A date older than the free 90-day window is shortened to the oldest free day, not refused, and the answer names the date it really used",
            "maxLength": 10,
            "type": "string"
          },
          "from": {
            "description": "Currency the amount is in. Cross rates go through the euro, the only pair the ECB publishes",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          },
          "to": {
            "description": "Currency to convert into; defaults to the shared business profile's default_currency, so you are never asked what currency you invoice in. The result is rounded once, at the end, to this currency's own ISO 4217 minor units, so JPY comes back whole and BHD to three places",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          }
        },
        "required": [
          "amount",
          "from"
        ],
        "type": "object"
      },
      "name": "convert"
    },
    {
      "description": "Convert one amount into many currencies off the SAME ECB rate date, each rounded to its own minor units. For several lines at once (mixed-currency invoice lines), call it once per line: every line then shares one rate date. Unknown targets are listed, never failed.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "amount": {
            "type": "number"
          },
          "from": {
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          },
          "to": {
            "description": "Target currencies",
            "items": {
              "pattern": "^[A-Za-z]{3}$",
              "type": "string"
            },
            "maxItems": 60,
            "minItems": 1,
            "type": "array"
          }
        },
        "required": [
          "amount",
          "from",
          "to"
        ],
        "type": "object"
      },
      "name": "convert_many"
    },
    {
      "description": "Every currency in the ECB daily set with its rate against the euro and its decimal places. This is the whole domain: a code not on this list cannot be converted, quoted or historised here.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "currencies_list"
    },
    {
      "description": "Call this tool when a rebill or an invoice spans more than one currency, instead of asking the user for rates. Returns the fx_rates object expense_to_invoice takes, plus the rate date to write on the invoice.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "currencies": {
            "description": "The other currencies present, e.g. [\"EUR\", \"GBP\"]. Direction: each returned rate means 1 unit of that key = X units of the target, so {\"EUR\": 1.08} is 1 EUR = 1.08 of the target. The target needs no rate of its own",
            "items": {
              "pattern": "^[A-Za-z]{3}$",
              "type": "string"
            },
            "maxItems": 60,
            "minItems": 1,
            "type": "array"
          },
          "target": {
            "description": "The currency the invoice will be issued in; defaults to the shared business profile's default_currency. Pass it on as target_currency alongside the fx_rates object",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          }
        },
        "required": [
          "currencies"
        ],
        "type": "object"
      },
      "name": "fx_rates_for"
    },
    {
      "description": "Turn Pro on for this connection with key, an MCPL1.<payload>.<signature> issued at checkout for this server or the bundle. Data under your token stays; a wrong or expired key changes nothing. license_status confirms it.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "key": {
            "description": "License key from checkout, MCPL1.<payload>.<signature>",
            "type": "string"
          }
        },
        "required": [
          "key"
        ],
        "type": "object"
      },
      "name": "license_activate"
    },
    {
      "description": "Report this endpoint's licence state for your token as JSON: the product, the tier free or pro, why it is not Pro, and the checkout URL. Call it to explain a free-tier refusal. No arguments, nothing changes.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "properties": {},
        "type": "object"
      },
      "name": "license_status"
    },
    {
      "description": "Call this tool for the ECB rate of one currency pair across a window. Returns one row per published day plus the min, max, average and the change. A window wider than the free 90 days is shortened, not refused.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "days": {
            "description": "Trailing window in calendar days, default 30. Only TARGET business days carry a rate, so 30 days holds about 21 rows. Free reads up to 90 days back; Pro reads the whole series back to 1999-01-04",
            "maximum": 20000,
            "minimum": 1,
            "type": "integer"
          },
          "from": {
            "description": "Base currency of the pair",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          },
          "from_date": {
            "description": "ISO date, inclusive. Overrides days. Free is limited to the last 90 days",
            "maxLength": 10,
            "type": "string"
          },
          "max_rows": {
            "description": "Cap the table, default 200. min/max/avg still cover the whole window",
            "maximum": 2000,
            "minimum": 1,
            "type": "integer"
          },
          "to": {
            "description": "Quote currency of the pair. Each row is 1 from = X to",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          },
          "to_date": {
            "description": "ISO date, inclusive, default today",
            "maxLength": 10,
            "type": "string"
          }
        },
        "required": [
          "from",
          "to"
        ],
        "type": "object"
      },
      "name": "rate_history"
    },
    {
      "description": "Call this tool for the ECB rate of one pair on one date. Returns both directions and the rate date, so a reciprocal is never reported as the published figure. A date beyond the free window is shortened, never refused.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "date": {
            "description": "ISO date YYYY-MM-DD. If the ECB published nothing that day - every weekend, 1 January, Good Friday, Easter Monday, 1 May, 25 and 26 December - the last rate published on or before it is returned and the answer names that date. Free covers the last 90 days: an older date is shortened to the oldest free day rather than refused, and rate_date says which day the numbers are really from. Pro covers every date back to 1999-01-04",
            "maxLength": 10,
            "type": "string"
          },
          "from": {
            "description": "Base currency. The ECB quotes every currency per 1 euro, so \"the ECB rate for USD\" is from EUR to USD, not the other way round; invert only if the user asked for the inverse",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          },
          "to": {
            "description": "Quote currency. The rate returned is 1 from = X to",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          }
        },
        "required": [
          "from",
          "to",
          "date"
        ],
        "type": "object"
      },
      "name": "rate_on"
    },
    {
      "description": "Call this tool for the latest ECB daily reference rates against any base: 1.0812 for USD means 1 base = 1.0812 USD. Crosses go through the euro. Returns the ECB rate date and the cache age.",
      "inputSchema": {
        "$schema": "http://json-schema.org/draft-07/schema#",
        "additionalProperties": false,
        "properties": {
          "base": {
            "description": "Base currency; defaults to the shared business profile's default_currency, else EUR. A rate of 1.0812 for USD means 1 base = 1.0812 USD. Cross rates go through the euro, the only pair the ECB publishes",
            "pattern": "^[A-Za-z]{3}$",
            "type": "string"
          },
          "quotes": {
            "description": "Only these currencies, at most 200. Omit for all of them",
            "items": {
              "pattern": "^[A-Za-z]{3}$",
              "type": "string"
            },
            "maxItems": 200,
            "type": "array"
          }
        },
        "type": "object"
      },
      "name": "rates_latest"
    }
  ]
}

What the leaf hashes

{"body":"3ed288fdce0fd7e33edc7e4a7e85eab4b07708b8a34e1df1845e873be6472d9d","id":292715,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793048919005091,"prev":null,"subject":"0c15f610-cd0a-4985-abf8-564d2ad3ec15","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. 0x2fd6e283ca7776ed6299c6362624b2132ac0e32c0733597e48bab256ef01cb5b
2. 0x80ef913e80274fc78832dca2d3e58711f024095698dab708fc8498bca7760ea0
3. 0xc8fd138abb114dedf6528d3a5b7b54c0bc705e198d71c17b092e33682c5ea9bc
4. 0x61e1b0ac62363a9becfce976751e1610ace1f46185d4f6dd8b4e5fbccaabee87
5. 0xeb2f8b87dcd1ca835afc4dbf7206eedf3816514464fd06dde24a3cba3a77c4b5
6. 0xf2107c5e2bd56707891f89706f708832100a13ad9b94473629ceb3e4a10c7347
7. 0x9114ef248f7bb36ab76f287df089d5d7d40e46d0b46bfc72a8eb751f55a448db
8. 0xcc8c0a285cace86d40db25559f3d160bc0c96e3dbd4477f679a564d729ef5b8c
9. 0xa711c79ca7526e1d40ee8807ac8b781ed3c92e62ff1cb9993eef5db1ba482740
10. 0x6b688efccc67667934f53af0dda473be5dd9a09af5b20b03ee9e17b11c036418
11. 0x5706295a72541360bda32c42f2b8bcd1e27be58a3989ae29fd4aeb7edddae0ae
12. 0x12cda00da304cf48d9b3c1874c07a6f0a2e143ba0d25e359b8fd805abb057b32
13. 0x36a44931b230976c04691d90bf3a25ed4111d74c78b672850d8025a911ca88dd
14. 0x683955a5b2250ad50568d022a6580d8739b6aff1356779d72a773b088e7c289c
15. 0x610738e0c43687aded83c613c73de8b5226c73c375858a167436461c522ea213
16. 0x06d71bfa7d8b41d62c8836efc2c601e1cc3772d9453596b2ae4950887f3310ca
17. 0x8c756542e482157df0c36464d75c937b845e4423dbbcfad08f0cf8d5a16b9a13
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae