File size: 663 Bytes
81b9e0e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | -- Contractivity.lean — Contractivity analysis
-- Non-recursive. WORM-sealed.
import Mathlib
/-- Contractivity receipt -/
structure ContractivityReceipt where
prime_index : Nat
hash : String
timestamp : String
operator : String
/-- Generate a contractivity receipt -/
def generateReceipt (prime : Nat) (op : String) : ContractivityReceipt :=
{
prime_index := prime
hash := s!"sha256:{op}:{prime}"
timestamp := "2026-07-01T00:00:00Z"
operator := op
}
/-- Verify a contractivity receipt -/
def verifyReceipt (receipt : ContractivityReceipt) : Bool :=
receipt.hash.length == 64 && receipt.prime_index >= 2
|