XERC20 token implementation

[EgeCaner]

Scope

• XERC20 token implementation
• XERC20Lockbox implementation
• XERC20Factory implementation

Differences from solidity implementation

Deployment pattern

Solidity implementation uses CREATE3 to be able to deploy different implementation on same address among multiple EVM chains. Since we cannot have same addresses with EVM chains this pattern is not applied.

Upgradeability

In Solidity implementation none of these contracts are upgradeable!

• In Cairo implementation xerc20 and lockbox is upgradeable to be more future proof.
  • Only owner of xerc20 can upgrade implementation of xerc20 and lockbox.
• xerc20 and lockbox implementation factory deploys can be updated with new class hashes in the future.