Skip to main content

Build on Bitcoin

BOB is a layer 2 stack empowering everyone to build and innovate on Bitcoin.

What is BOB?

BOB combines the power of Bitcoin security and stability with innovation enabled by the EVM and the OP stack. BOB supports the Bitcoin ecosystem incl. Ordinals, Lightning and Nostr, powered by cross-chain light clients, a universal Bitcoin smart contract SDK and the RiscZero zkVM.

Our mission is to create a Bitcoin rollup ecosystem to power innovation and experimentation without relying on Bitcoin forks.


  • Experimentation: We enable a diverse space of innovators to play with ordinals, ZK, SocialFi, DAOs, and more.
  • Real-world impact: Innovations improve people's lives by giving them access to Bitcoin values.
  • Freedom of choice: Builders focus on the unique values of their projects without having to re-invent the wheel.

Get Started


Understand why we are building BOB and how it works on a high level. Then, dive into the details of the stack and the technology.


One of the best ways to understand technology is using it. Follow our tutorials to build your first BOB project.