🛡️Security

UUPS Proxies

In order to be able to improve and secure the protocol, the following smart-contracts use UUPS Proxy pattern to make them upgradeable:

• AccessManager

• FeesManager

• KYCToken

The UUPS proxy pattern was first documented in EIP-1822. Unlike Transparent pattern, in UUPS the upgrade logic is handled by the implementation contract itself. The UUPS implementation used by Shprd smart-contracts is the OpenZeppelin UUPSUpgradeable interface.

EIP-1822: Universal Upgradeable Proxy Standard (UUPS)Ethereum Improvement Proposals

EIP-1822

Proxies - OpenZeppelin Docs

OpenZeppelin UUPSUpgradeable interface

Beacon Proxy

Vault smart-contracts use Beacon proxy pattern to be able to change the logic of all the vaults created at once. The beacon proxy pattern was first documented in EIP-1967. The Beacon implementation used by Shprd smart-contracts is the OpenZeppelin UpgradeableBeacon interface.

EIP-1967: Standard Proxy Storage SlotsEthereum Improvement Proposals

EIP-1967

Proxies - OpenZeppelin Docs

OpenZeppelin UpgradeableBeacon interface