The advantages of ZK-based fraud proofs are clear and they're becoming a much more common choice now with the help of @RiscZero's Kailua. To summarize what we earlier talked about in a blog post some months back, , the core advantage of ZK fraud proofs lies in their ability to streamline dispute resolution and enhance rollup flexibility. This is evident in three key areas:

Efficient Dispute Resolution: Unlike bisection games that demand numerous on-chain interactions, ZK fraud proofs enable challengers to validate claims with a single on-chain verification of a ZK proof. While technically a two-step process (dispute initiation followed by proof submission, allowing time for proof generation), this significantly reduces the on-chain footprint compared to traditional methods.

Flexible Rollup Architecture (Hybrid Mode): ZK fraud proofs introduce a "hybrid mode" capability, allowing for seamless transitions between optimistic and validity rollup models. This means an optimistic rollup secured by ZK fraud proofs can effectively transform into a validity rollup by simply proving every block, offering unprecedented architectural flexibility.

Accessible and Secure Participation: ZK fraud proofs drastically lower the barrier to participation in dispute resolution. Compared to systems like Arbitrum's BOLD, which require substantial bonds (e.g., 3600 ETH) to initiate a dispute, ZK fraud proofs can operate with bonds as low as hundreds of dollars. The bond only needs to be set slightly above the proving cost, effectively preventing spam while fostering open and widespread participation.

and it's also great to see BOB reach stage-0 with Kailua