We introduce a new puzzle, "settlement_payments", which pays out coins and make an announcement for each new coin created.
settlement_payments.cl:
(mod (coins_paid)
;; `coins_paid` is a list of notarized coin payments
;; a notarized coin payment is `(nonce puzzle_hash amount ...)`
;; Each notarized coin payment creates a `(CREATE_COIN puzzle_hash amount)` payment