Admin upgradeability

As L2s work through the stages of training wheels to become fully decentralized, chains that opt in to the AggLayer implement shared security mechanisms with other AggLayer chains including the Polygon zkEVM to ensure the safety of users.

Chains opted into the AggLayer share the following upgradeability controls:

1. The security council (contract address) that can be used to trigger the emergency state which can pause bridge functionality, prevent smart contract upgrades, or stop the sequencer from sequencing batches.

2. The admin role (contract address) that can perform upgrades to patch bug fixes or add new features to the system by upgrading smart contracts with a 10-day waiting period (unless emergency state is active).

Further reading

• zkEVM protocol upgradability.
• zkEVM admin role and governance.
• zkEVM upgrade process.
• zkEVM security council.
• zkEVM emergency state.
• L2Beat - Polygon zkEVM.