Stablecoin payments company Rain is the latest crypto company to seek an Office of the Comptroller of the Currency (OCC) trust-bank charter, joining a growing group of firms trying to bring custody and stablecoin operations under federal supervision. TheRain National Trust bank, a proposed New York subsidiary, would provide fiduciary custody of digital assets and U.S. dollars, manage reserves for permitted stablecoin issuers and issue and redeem dollar-backed stablecoins for institutional clients.