zkSync Era posted that it is transitioning to a new STARK-based proof system called Boojum, which complements the zkSync Era sequencer. Boojum provers only need 16GB RAM, which can realize the decentralization of large-scale provers in the future. At present, the shadow certificate has been launched on the mainnet. At this stage, the shadow mode of the mainnet is in the testing stage, but the "shadow certificate" has been generated and verified in the mainnet block. Boojum features include PLONK-style arithmetic, FRI commitment scheme, efficiency of "boring" parts of the system, ease of scaling, single stack, etc. Boojum can enhance performance and also reduce decentralized hardware requirements, proving transactions faster.