In this video I explain how smart contracts have limited access to data and how Brevis expands this access to include historical state, blockchain history, and even other chains. I also explain the 2 modes which Brevis has for this data access: a pure zk mode, and an optimistic mode.0:00 - intro
0:24 - smart contract data
7:10 - pure zk mode
9:35 - optimistic mode
15:59 - proofs of non-existence & completeness
19:08 - system defined challenge window
22:47 - user defined challenge window
26:02 - challenge process
32:46 - outro
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