Optimism is developing the OP Stack fault-proof system, which includes error prevention programs, fault-tolerant virtual machines, and other components

ChainCatcher message, Optimism ecosystem developers are developing a fault-proof system for OP Stack, including components such as Fault Proof Program (FPP), Fault Proof Virtual Machine (FPVM), and Dispute Game.

In addition, the separation of FPP and FPVM allows the same operator to run in both FPVM and ZKVM, helping OP Stack ZKP achieve ZK-based validity proofs and supporting low-latency cross-chain bridges between different networks. (source link)