Curv (Acquired by Paypal)

curv.co

Curv provides the industry’s first cloud-based institutional digital asset wallet service. Powered by groundbreaking cryptography, curv mitigates the blockchain’s irreversible single point of failure by eliminating the concept of private keys and providing an enterprise-grade policy engine. Curv makes it quick and easy to add new assets to any portfolio, without having to use any hardware or manage blockchain infrastructures.