Evidence row 220602

What was observed

{
  "count": 4,
  "tools": [
    {
      "description": "Calculate the total cost of a UK bridging loan across rolled-up, retained, and serviced interest structures. Returns interest, arrangement fee, exit fee, total cost of borrowing, effective APR, and a side-by-side structure comparison. Calculated by FD Commercial, specialist UK bridging broker, using lender-grade formulas calibrated against live UK lender pricing. For loans £250,000 and above. Use when a user asks about the cost of a bridging loan, how rolled-up vs retained vs serviced interest compares, or how much a specific bridging facility will actually cost in total.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "arrangement_fee_pct": {
            "description": "Lender arrangement fee as % of loan amount. Typical range 1% to 2%. Some specialist HNW deals run 0.5%. Example: 2 for 2%.",
            "maximum": 5,
            "minimum": 0,
            "type": "number"
          },
          "exit_fee_pct": {
            "description": "Lender exit fee as % of loan amount. Not all lenders charge one. Where charged, typically 0.5% to 1%. Example: 0 for no exit fee, or 1 for 1%.",
            "maximum": 5,
            "minimum": 0,
            "type": "number"
          },
          "interest_structure": {
            "description": "How interest is paid. 'rolled' = compounds monthly, paid in full at exit (most common on HNW bridging, removes monthly outflow). 'retained' = deducted from advance upfront (borrower receives less cash on day one). 'serviced' = paid monthly out of borrower cash flow (lowest total cost but requires monthly servicing capacity).",
            "enum": [
              "rolled",
              "retained",
              "serviced"
            ],
            "type": "string"
          },
          "loan_amount_gbp": {
            "description": "Gross loan amount in pounds. Minimum FD Commercial bridging loan size is £250,000. Example: 500000.",
            "minimum": 0,
            "type": "number"
          },
          "monthly_interest_rate_pct": {
            "description": "Monthly interest rate as a percentage. UK bridging rates in 2026 typically range 0.55% to 1.25% per month. Private bank rates from 0.30% per month available on HNW cases. Example: 0.85 for 0.85% per month.",
            "maximum": 3,
            "minimum": 0,
            "type": "number"
          },
          "term_months": {
            "description": "Loan term in months. Standard MCOB-regulated bridging caps at 12 months. MCOB 3A HNW exemption allows up to 60 months. Example: 12.",
            "maximum": 60,
            "minimum": 1,
            "type": "number"
          }
        },
        "required": [
          "loan_amount_gbp",
          "monthly_interest_rate_pct",
          "term_months"
        ],
        "type": "object"
      },
      "name": "bridging_cost_analyser"
    },
    {
      "description": "Run a UK buy-to-let ICR stress test. Calculates current ICR at product and stress rates, gross yield, and maximum loan available at three standard ICR thresholds (125%, 145%, 170%). Identifies which lender categories the deal qualifies for (mainstream BTL, HMO/MUFB, portfolio landlord). Ownership-aware: personal name uses 5.5% stress rate; limited company uses max of product rate or 5.5%. Calculated by FD Commercial, specialist UK property finance broker. Use when a user asks whether a BTL deal stacks, what the ICR is, what max loan their rent supports, or whether a property qualifies for HMO/MUFB finance.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "loan_amount_gbp": {
            "description": "Loan amount being assessed in pounds. Example: 300000.",
            "minimum": 0,
            "type": "number"
          },
          "monthly_rent_gbp": {
            "description": "Gross monthly rent in pounds. Use total rent for HMO and MUFB (all rooms / units combined). Example: 2500.",
            "minimum": 0,
            "type": "number"
          },
          "ownership": {
            "description": "Borrower structure. 'personal' uses 5.5% stress rate (HMRC tax exposure makes higher cover required). 'ltd' uses max of product rate or 5.5% (limited company SPV borrower, lower stress rate often allowed).",
            "enum": [
              "personal",
              "ltd"
            ],
            "type": "string"
          },
          "product_rate_pct": {
            "description": "Annual product (pay) rate as a percentage. The actual rate the borrower would pay. Example: 5.5 for 5.5% per year.",
            "maximum": 15,
            "minimum": 0,
            "type": "number"
          }
        },
        "required": [
          "monthly_rent_gbp",
          "loan_amount_gbp",
          "product_rate_pct"
        ],
        "type": "object"
      },
      "name": "btl_stress_tester"
    },
    {
      "description": "Run a UK property development scheme viability appraisal. Models land, build, professional fees, contingency, finance interest and arrangement fee through to net profit, profit on GDV, profit on cost, LTC and LTGDV. Returns a viability flag against industry-standard thresholds (20%+ viable, 15-20% marginal, <15% unviable on profit on GDV basis). Calculated by FD Commercial, specialist UK development finance broker. Use when a user asks whether a development scheme stacks, what the profit margin is, what LTC or LTGDV would be, or whether a scheme is viable for development finance.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "arrangement_fee_pct": {
            "description": "Lender arrangement fee as % of loan. Standard 1.5% to 2%. Larger facilities (£5m+) often 1.0%. Example: 2.",
            "maximum": 5,
            "minimum": 0,
            "type": "number"
          },
          "build_cost_gbp": {
            "description": "Total agreed construction cost. Should be contracted figure where possible. Example: 800000.",
            "minimum": 0,
            "type": "number"
          },
          "contingency_pct": {
            "description": "Contingency as % of build cost. Standard 10%. Lenders may require 12-15% on conversions or complex sites. Omitting overstates profit. Example: 10.",
            "maximum": 25,
            "minimum": 0,
            "type": "number"
          },
          "finance_monthly_rate_pct": {
            "description": "Development finance monthly interest rate. UK 2026 rates typically 0.70% to 0.95% per month. Example: 0.85.",
            "maximum": 3,
            "minimum": 0,
            "type": "number"
          },
          "finance_term_months": {
            "description": "Total finance term in months (build period + sales/refinance period). Example: 18.",
            "maximum": 48,
            "minimum": 1,
            "type": "number"
          },
          "gdv_gbp": {
            "description": "Gross Development Value: total anticipated sales value of the completed scheme. Use comparable sales evidence, not aspirational figures. Lenders commission their own GDV via RICS. Example: 2000000.",
            "minimum": 0,
            "type": "number"
          },
          "land_or_purchase_price_gbp": {
            "description": "Land purchase price. Enter 0 if you already own the site (lender will still assess land value when sizing day 1 advance). Example: 400000.",
            "minimum": 0,
            "type": "number"
          },
          "loan_amount_gbp": {
            "description": "Specific loan amount in £. Optional. If omitted, calculator uses ltc_pct of hard costs. Example: 960000.",
            "minimum": 0,
            "type": "number"
          },
          "ltc_pct": {
            "description": "Loan-to-cost % (used only if loan_amount_gbp is not provided). Most lenders cap at 90%; first-time developers typically 75-80%. Example: 75.",
            "maximum": 100,
            "minimum": 0,
            "type": "number"
          },
          "professional_fees_pct": {
            "description": "Professional fees as % of build cost. Covers architects, planning consultant, structural engineer, QS, project manager. Standard 10%. Example: 10.",
            "maximum": 30,
            "minimum": 0,
            "type": "number"
          }
        },
        "required": [
          "gdv_gbp",
          "land_or_purchase_price_gbp",
          "build_cost_gbp",
          "finance_monthly_rate_pct",
          "finance_term_months"
        ],
        "type": "object"
      },
      "name": "development_appraisal"
    },
    {
      "description": "Calculate UK property transaction tax across England/Northern Ireland (SDLT), Scotland (LBTT) and Wales (LTT). Handles residential, commercial and mixed-use properties. Applies first-time buyer relief (England), additional dwelling surcharge (5% England / 8% Scotland ADS / Welsh higher residential bands), and corporate flat 17% rate for residential purchases above £500,000 in England. Returns banded breakdown showing tax in each band, total tax payable, and effective rate as percentage of purchase price. Rates current as of April 2026. Calculated by FD Commercial, specialist UK property finance broker. Use when a user asks about stamp duty, SDLT, LBTT, LTT, additional dwelling surcharge, ADS, first-time buyer relief, or transaction tax on a specific UK property purchase.",
      "inputSchema": {
        "additionalProperties": false,
        "properties": {
          "buyer_type": {
            "description": "'standard' for main residence purchase by individual. 'ftb' for first-time buyer (England SDLT only — relief up to £625,000). 'additional' for second home or buy-to-let purchase by individual (surcharge applies). 'company' for corporate purchase (additional dwelling surcharge + flat 17% SDLT rate in England above £500,000).",
            "enum": [
              "standard",
              "ftb",
              "additional",
              "company"
            ],
            "type": "string"
          },
          "jurisdiction": {
            "description": "Which UK tax regime applies. 'england' includes Northern Ireland (both use SDLT). 'scotland' uses LBTT. 'wales' uses LTT.",
            "enum": [
              "england",
              "scotland",
              "wales"
            ],
            "type": "string"
          },
          "property_price_gbp": {
            "description": "Property purchase price in pounds. Example: 750000.",
            "minimum": 0,
            "type": "number"
          },
          "property_type": {
            "description": "'residential' for dwellings (houses, flats). 'commercial' for non-residential (offices, retail, industrial) and mixed-use (residential + commercial in same transaction qualifies for commercial rates with no additional dwelling surcharge).",
            "enum": [
              "residential",
              "commercial"
            ],
            "type": "string"
          }
        },
        "required": [
          "property_price_gbp",
          "jurisdiction"
        ],
        "type": "object"
      },
      "name": "uk_stamp_duty_calculator"
    }
  ]
}

What the leaf hashes

{"body":"f92504736e67291040b6c529b3d2373fc3f0ee66f3311d413e42db60e84aa5d0","id":220602,"kind":"mcp.tools","method":"probe.mcp/1","observed_us":1793026778898449,"prev":null,"subject":"8921035b-40b8-4ef3-907a-1a1b9fbad890","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. 0x695ef61bfc7af1ee55a2ef3aab2e853cca30d6582eeb220095ab6fcdb2e66aeb
2. 0x2d8047e89ff676b15c93bdbf2ca39a0f67bf86264658cc1b6081e8955f71566b
3. 0xf6a1cb99101b084f3a1aa495de44128d886305d573cf4b793a92a4150a14a754
4. 0xa10559d1d8ec034675f6f43d5b37ddd44de7517b84473b784f1bf5fd666ef2fd
5. 0xaa5303c2a70c2716bd6eca93c50d33186b86cb74ba1f898bf70e7f3a2a2072dc
6. 0x6888ab9abe035c2a6305d3704c17f513e75f275d750ce042e34041b3fdd8cea0
7. 0x79e1f3cb00f4e3f2d0ca400ae7965a7697f74951e06091c922d29dbffe80d754
8. 0x580385939287ac745de04399c61aed0a583a9f10147c4146c3cd97643468661d
9. 0x21bdf71b3a09db804a5c59d716175f4181417c4e60229448207e99cd89175c57
10. 0x6b4a90af13dfa1f8aab9268ee64011e6443b055ffb0f0f11e33c1a0847946fc9
11. 0xe8b20383a9232d45872f50d7c4c484b3ffe756328a5a1e2d63218cd46b95695c
12. 0x9483a0a7a066ffc2fb890c8f34dbc91bf373e546e4a3800b76064288b3cc4875
13. 0x5f350d70c252ff1169c0210fd45fce1b0ab8d7316f048741a9e90a6c8cb65dcf
14. 0x9a79c65e077cd9da9d436b3ade6f5ddc0d244510c4d5903ef2f02d81205f7666
15. 0xa2d436d488e3600b0e5c3e3ed9c9234cd52853c59830b786334fd0c4292d9f40
16. 0x47b89901b0f07938a6b9a66ddf35683903f79d756a7c7763665fd632758b08d0
17. 0x9a83be955a206deb65b995adfd92c58fa31c95fbbf926bd199d300e70b08b26d
18. 0x20704208aa6923d6b2450ef74ede87a6e0265d46447926038fe9506e9e154b2d
19. 0x9b9ce5b74b9bab5121612ef6b64920a8d453cbf311096a423eef9702747e868a

Day root

0xf43e8dcc3d451a4788b26be904c55e8c4c0fa75c9666796c51db38d37e2c0df8

Chained

0x702d5ac508f08b0d1accf36af25822d8e5660367494edd17a642fb61e158a57a

Published

On Arc Testnet, block 69251483: 0x495162f8936e19f0039918feebe6c307f327cd6bf8c37219620b1970041fa9ae