Citigroup is set to introduce a Bitcoin custody service for institutional clients later this year. This service will integrate Bitcoin into Citigroup's existing custody, reporting, and tax framework, allowing clients to manage crypto assets, securities, and cash under a single master custody account. The service will also support cross-margin arrangements between digital and traditional assets. Clients will be able to execute transactions via SWIFT, API, or interface instructions, with the bank handling the clearing and settlement processes.