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2 commits this week Apr 07, 2026 - Apr 14, 2026
williamdemeo
williamdemeo · · formal-ledger-specifications
CIP-159-11: Initial PoV property module skeletons (#1123) 
Add preservation-of-value property modules for the Dijkstra era,
adapted from the Conway PoV proof structure for CIP-159 (partial
withdrawals and direct deposits).

New modules:
- Certs.Properties.PoVLemmas: CERT-pov, POST-CERT-pov, sts-pov,
  PRE-CERT-pov (adapted for applyWithdrawals subtraction semantics)
- Certs.Properties.PoV: CERTS-pov top-level theorem
- Certs.Properties.ApplyWithdrawalsPov: Key new lemma showing
  applyWithdrawals decreases rewardsBalance by exactly getCoin wdrls
- Ledger.Properties.PoV: HasCoin instances, LEDGER-pov statement
  with proof sketch for direct deposit cancellation

Design notes:
- PRE-CERT-pov delegates to applyWithdrawals-pov (fold induction)
  instead of Conway's constMap/res-decomp/sumConstZero chain
- LEDGER-pov identifies the applyDirectDeposits cancellation as the
  main new proof obligation vs Conway
- applyWithdrawals-pov is structured as three layers: single-step
  (applyOne-pov), fold induction (foldl-applyOne-pov), top-level

Status: Skeleton with holes; does not yet fully typecheck.
f8a60cf7 · 1123-cip-159-11-prove-pov-and-invariants · 4/646 ++ 0 --
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