Shared sequencing on Bitcoin

Espresso proposes a shared sequencing marketplace that would let Bitcoin rollups and sidechains decentralize their sequencers, with proposers bidding on rollup slots. The blog post describes how Bitcoin rollups could integrate, using BitVM to run an Espresso light client optimistically under a 1-N trust assumption, so a bridge program can read Espresso headers and Tiramisu DA blobs. The author notes that Bitcoin script limitations rule out a direct data availability bridge to an on-chain Bitcoin contract. The post also lists open questions, such as whether Bitcoin miners could act as HotShot proposers and whether Bitcoin rollups could synchronize slots with Ethereum L1.