Strata (Alpen Labs) ZK rollup on Bitcoin developed by Alpen Labs. Aims to be a flexible execution environment with EVM compatibility and a trust-minimized bridge to Bitcoin. Architecture - Off-chain execution (zkEVM-style). - Validity proofs committed to Bitcoin. - BitVM-class bridge for trust-minimized peg-in/out. - Sequencer for ordering txs (initially centralized, decentralizing). Status - Active development; testnet phases through 2025-2026. - Mainnet: pending (check current docs). - Comparable goals to Citrea but distinct implementation choices. Use cases - DeFi : Solidity contracts on B…