Fault Proofs system upgrades

Fault Proofs are the mechanism by which OP Stack chains (OP Mainnet, Base, World Chain, MegaETH, etc) validate withdrawals to Ethereum (or the relevant settlement chain).

As upgrades change or update the underlying proof mechanism, in-flight bridges at the time of the upgrade will be delayed and may need to be re-proved.

Below we detail the different upgrades that can take place with the fault proofs system, and what you can expect if you have a delayed bridge.

Superbridge does everything it can to prevent users initiating withdrawals that will be delayed or submitting prove operations that will be invalidated, but sometimes we only learn of chain upgrades a few days before, or in the worst case after, they occur.

Older networks will often schedule an upgrade to the Fault Proofs system well ahead of time. But after it is in place there are a number of further upgrades that can take place to improve the system.

You can find detailed information about each upgrade and a subset of the chains it will affect on the Optimism website.

Once a network has been upgraded to fault proofs, there are a number of parameters and configuration values that can be updated onchain to further improve the security of the system.

These updates are often not publicly scheduled or well known ahead of time.

If a Fault Proof system parameter has been updated for a chain, Superbridge will provide this information in the activity screen and you may need to re-prove a withdrawal you previously proved.