The London-based firm will be working with cryptography company Unbound Tech to provide the services. : London-based cryptocurrency exchange Archax said on Tuesday that it will be launching its own custodial service for digital assets. The new service will be provided in partnership with Unbound Tech, a cryptography firm that is backed by several notable investors, including Goldman Sachs and Citi Ventures. “As a digital asset exchange targeted at institutions, it was vital that we could offer the very best and most secure solution for storing clients’ wallets and keys,” said Archax CEO Graham Rodford.