BOB Becomes the First Hybrid ZK Rollup
BOB claims to be the first Hybrid ZK Rollup, pioneering the use of zero-knowledge proofs both as fraud proofs and for on-demand validity proofs.
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BOB is the first Hybrid ZK Rollup
Traditionally, rollups have followed two separate models: optimistic rollups, which assume transactions are valid but require a 7-day challenge window, and validity rollups, which verify transactions instantly via zero-knowledge proofs but are expensive to operate. OP Kailua introduces a third Hybrid ZK option by applying ZK proofs to the fraud resolution process in optimistic rollups, merging low operating costs with fast finality, dramatically increasing scalability, security, and decentralization in layer-2 design. This model also gives the option to submit validity proofs on demand, allowing BOB to get the best of both worlds: cheap transactions and verification by default, and full validity for fast finality when required.