Antithesis, a startup focused on deterministic simulation testing for distributed systems, has raised $105 million in a Series A funding round led by Jane Street. The company provides a platform that enables engineers to identify and reproduce bugs in live networks, including blockchain protocols. Notably, Ethereum utilized Antithesis's simulation technology prior to its merge, contributing to the startup's over 12x revenue growth in the past two years. The new funding will be used to expand engineering capabilities and support global market growth.