{
  "name": "interest-accrual-recompute",
  "domain": "Audit & Assurance",
  "title": "Interest Accrual Recompute",
  "description": "Core Verify pack, chain 1 of 3 (CORE-VERIFY-BUILD-SPEC.md §1): independently recomputes a core-system-reported interest accrual figure from the caller-declared principal, annual rate, day-count basis, and days accrued, then diffs the recomputed figure against the core's reported amount under a caller-declared variance tolerance. This chain configures the existing audit recalculation suite (art-463) to its interest_accrual category only -- no new kernel, no new node. The day-count/compounding convention is a contract term the caller declares for each item, never inferred or defaulted by this chain. A DIVERGES result names the exact recalculated-vs-reported variance in cents and percent for the flagged item(s); MATCHES/DIVERGES/INDETERMINATE semantics are the underlying node's own verdict, unchanged.",
  "composer_url": "https://ainumbers.co/chaingraph/chains/interest-accrual-recompute.html",
  "regulatory_refs": [
    "ISDA 2006 Definitions Section 4.16 (day-count fraction conventions) -- the day-count/compounding convention recomputed here is a caller-declared contract term, not a regulation; this is the standard cross-industry reference for day-count fraction definitions, dated as of the 2006 ISDA Definitions"
  ],
  "regulatory_basis_status": "not_assessed",
  "regulatory_basis_decided_by": "BUILD-COREVERIFY-CHAINS-1",
  "regulatory_basis_decided_at": "2026-08-17",
  "export_capability": ["json"],
  "steps": [
    {
      "tool_id": "art-463-recalc-suite",
      "handoff": "Recomputes each declared interest-accrual item (principal, annual_rate_pct, days_accrued, day_count_basis) independently and diffs the result against the core-reported interest figure, flagging any variance outside the caller-declared tolerance (tolerance_abs, tolerance_pct). Terminal stage -- this chain runs the suite's interest_accrual category only; the suite's other four categories (depreciation, EPS, amortization, prepaid roll-forward) are out of scope for this chain and are not invoked."
    }
  ]
}