The upgrade of @ build_on_bob to become the first hybrid zk Rollup is a milestone for @ boundless_xyz. This means that the OP Kailua and Boundless zk fraud proof services developed by @ RiscZero, the parent company of @ boundless_xyz, have been implemented for the first time on the BOB chain. The core of Hybird zk Rollup lies in finding a path that is both time efficient and cost-effective between traditional Optimistic Rollup based on optimistic proofs and zk Rollup based on zk proofs. Based on the OP Kailua suite, @ build_on_bob implements the migration from a long-term interactive fraud proof system to a short-term non interactive zk fraud proof generated using RISC zkVM. @ boundless_xyz provides zk proof generation service for BOB. And all of this is just beginning. It is expected that more and more traditional Rollups will transform into more flexible Hybrid zk Rollups after BOB, which is the value of @ boundless_xyz driven by demand.