Custodia Bank has launched the first-ever U.S. bank-issued stablecoin on a permissionless blockchain.The stablecoin, named Avit, is tokenized on Ethereum and represents 'real dollars' as it is issued by a bank authorized to take demand deposits.Custodia's CEO, Caitlin Long, sees Avit as a way for legacy finance to benefit from blockchain technology within the banking system.The launch of Avit on Ethereum gained attention due to Custodia's CEO being a Bitcoin maximalist, sparking ironic remarks from observers.