Contracts Architecture

Upgradability:

• Immutable - the contract cannot be upgraded
• Migratable - the contract can be upgraded by their owners to newer versions provided by its factory
• Not Specified - the contract may or may not be upgradeable

Accessibility:

• VaultFactory, DelegatorFactory, and SlasherFactory are Ownable, their owners can whitelist new versions/types
• Vault is Ownable, its owner can migrate it to newer versions
• Vault, Delegator, and Slasher have an AccessControl (roles mechanic) for providing granularity across accessibility risks
• Collateral, StakerRewards, and OperatorRewards can have any accessibility