Evidence row 292709

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":292709,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793048916998560,"prev":null,"subject":"e44f113f-ce65-4c0a-aaa0-f3a50d11566e","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. 0x82d6c89454f1963d031c8e580a85cc1b242694aeea4d7d351c98f411eda43aad
2. 0x45f4c6405f846acbc213715e74212d12a8a1c71efe7f1399dc2b7692f54ed761
3. 0x0d77fbfe6e9bb0695e2a53f0ca126dcb023d03f38138d84a5cbd56f24a6f438d
4. 0xd96f91858cad4280f0c639e646b41396c70ad269ca6a9d4cae2a8a9f1b23d6ef
5. 0xd1b6402e43cf98d5662c96bd623d969957e2f55494cd38e8c278009129196e1a
6. 0x353b19fbe7199b3f90c3b0dbf9ff4cf4be155210ce39e8dbf1cbbaa09f36fcfb
7. 0x2db53e0fa28953e7d8d6d5a7f0c573d74e707c2bb3938c0f66c51aa4f280eb33
8. 0xfd981b6d893ee1bda662370d6dccec1fcbcda66ad837b83b9e410bc0c1283a49
9. 0xe381981faf4090d2a270681916d4ac58edcc0a97d757c7728ec01890e28d7918
10. 0x68b9c13007eacffd2dc146b099ac237e3cce9c995bb23c895d088539fb9a0df0
11. 0xc99774cfa2126cb7b4c49d6b3fd2510795689e2dec7886bdb1a009218327ef2e
12. 0x08155d70132f82e370214fc5b72194dfa6f5e57670b7bcf74776e8418302897e
13. 0x4d2ee986a690e903126f449b4e9e62d5572b350357ab4496a83488949b131c29
14. 0x0eff463856b0992d53ab7d8c0b97c71541413358bdd445710c1e4b6aeb4d8f78
15. 0x7eb603d37f0f22dae1ea013e391889906ffc0139ff26e25b044bee38eec8f9b2
16. 0x2b6e23e3624a1b66e1d2298cfbce99a93ce6b13d24a58112a71802d79c5f7a76
17. 0xd21942ae3214eff88e08ab04884fd4b11958b51af9a0741b7668e2d07a2c56c9
18. 0x9a9024edb5069d88a324facb310a5ce8e495214bbaa968f077bede437390194f
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae