In this talk, we’ll describe Zircuit - a zero-knowledge rollup built on the OP stack. We’ll highlight the benefits of building on the OP stack as well as the architecture of Zircuit and its unique features. We’ll highlight the key features that the OP stack provides rollup developers and highlight what needs to be added to make the result use validity proofs instead of fraud proofs. We’ll illustrate how Zircuit built the remaining infrastructure and provide insights into how Zircuit is built differently. Finally, we’ll talk about the security-focused features that makes Zircuit unique.