Astria is developing a decentralized shared sequencer network aimed at providing Rollups with fast finality, censorship resistance, composability, and decentralization. Astria's decentralized sequencer operates multiple sequencer nodes, allowing it to sequence Rollup transactions. In its operational model, users submit transactions to Rollups, which automatically enter their respective Rollup node memory pools. Combiners collect transactions and send them to sequencers, who aggregate the transactions into a shared block, finally sending pre-acknowledgement to users.