Update
UPUPS (Universal Proposeable Upgradeable Proxy Standard) Release
Oasis Sapphire introduces the UPUPS (Universal Proposeable Upgradeable Proxy Standard) release, which combines upgradeable contracts with confidential storage. This combination creates a new level of vault security, but it also introduces challenges such as simulation attacks. The article discusses the technical deep dive and the mechanism behind the attack, including the use of DELEGATECALL and the implementation of the UUPSUpgradeable standard to address these issues.