The concept of shared sequencer networks, a rollup-agnostic set of sequencers, is gaining attention with the first in production being built by Astria.
- Sequencers ensure censorship resistance or liveness in a rollup, meaning valid transactions must be included within a specific timeframe.
- Achieving both properties is challenging. Proposed consensus algorithms include Tendermint and HotStuff 2.
- The components of a decentralized sequencer set include JSON-RPCs, a block/batch builder algorithm, a p2p layer, a leader rotation algorithm, and an RPC client.
- Rollup nodes receive ordered blocks from sequencers for soft commit and ordered DA layer blocks for hard commit.
- The system uses a slot concept to regulate timing for block creation.
