Checks for Ukraine

Inspired by Jack Butcher's paradigm-shifting piece "Checks". Proceeds will be donated to the Ukraine Crypto Donation wallet at [0x165CD37b4C644C2921454429E7F9358d18A45e14] Verify periodical transactions from gillesdc.eth: https://etherscan.io/address/0xec98c7935ae1db71884969919de58cd776cc017c