Posted vs. Finalized Roots

Optimistic rollups employ a fraud proof system to ensure sequencers are posting honest roots to the settlement chain. These fraud proof systems first start with the posting of a root, and then after a time period, are considered finalized if no fraud is proven onchain. As a result, the system can be configured to allow fillers to use both posted and finalized roots.

For fillers, relying on posted roots allows them to quickly claim rewards on the origin chain after solving intents on the destination chain. However, this assumes that the roots posted by sequencers are defacto honest, which does introduce a mild trust assumption.

Relying on finalized roots adds zero new trust assumptions to the claiming process, as intents rewards become withdrawable only after roots have successfully been finalized on the settlement chain. The downside of this approach is that fillers must wait 3-7 days for these roots to finalize, during which time their capital remains locked up.

In Beta launch of the protocol, provers will be deployed to support both posted and finalized roots. However, during this Alpha launch, storage proofs for Bedrock and Cannon carry different trust assumptions. Namely, Bedrock proofs allow for posted roots to be used to intent proofs, while Cannon requires finalized proofs.