Built Kasa for the @SuperteamPL bounty: the Polish kasa zapomogowo-pożyczkowa - the workplace savings-and-loan fund ~1,000 of them run under the 2021 statute - rebuilt as a Solana program.
The treasurer (skarbnik) is a PDA. Nobody can run off with the money. 🧵
Bonus: it composes with Solana's native Subscriptions program (shipped June 2).
One recurring delegation with the kasa PDA as delegatee = auto-pulled monthly składka.
Payroll deduction, on-chain.