# L2 Scaling solutions

- [What are Bitcoin rollups?](/bvm/l2-scaling-solutions/what-are-bitcoin-rollups.md)
- [Optimistic rollups](/bvm/l2-scaling-solutions/optimistic-rollups.md): Bitcoin, scaled. NOS is a fast, stable, and scalable Bitcoin L2 blockchain.
- [ZK rollups](/bvm/l2-scaling-solutions/zk-rollups.md)