FDIC officials are asking banks for details on how they may engage with cryptocurrency while maintaining appropriate safeguards.

The Federal Deposit Insurance Corp. released a trove of documents related to its supervision of US banks that were providing services to the cryptocurrency industry or considering doing so, providing a glimpse into some of the regulator’s oversight priorities over the past few years.

FDIC Acting Chairman Travis Hill said the agency is overhauling its crypto approach, just as U.S. senators examined regulators keeping banks out of crypto.