Update
Oasis Sapphire: Upgradable Contracts with Confidential Storage
Oasis Sapphire introduces upgradable contracts with confidential storage, allowing a contract to hold private keys without revealing them. This is accompanied by a technical deep dive into potential security issues, such as simulated upgrades, and the implementation of a fix to prevent such attacks. The update is part of the Sapphire contracts library, available for use by anyone.