Stress testing company Antithesis raises $105 million, previously helped Ethereum’s “Merge” find vulnerabilities

[Chain Post] Antithesis, which specializes in stress testing for distributed systems, has just raised $105 million in a Series A round. This round was led by quantitative giant Jane Street, with an impressive lineup of co-investors—firms like Amplify, Spark Capital, and Tamarack Global all participated, and even Stripe co-founder Patrick Collison put in money.

What they do is pretty hardcore: running deterministic simulations for testing, specifically putting blockchain and financial systems through “stress exams.” Simply put, they create all kinds of extreme scenarios to force systems to expose bugs that wouldn’t normally show up. Before Ethereum’s big “Merge” upgrade, they used Antithesis’s service to simulate extreme situations—after all, if that upgrade had gone wrong, the whole network could’ve blown up.

Now their clients span three sectors: finance, AI, and blockchain, with revenue growing more than 12-fold over the past two years. The new funds will mainly be used in three areas: expanding the engineering team, boosting automation capabilities, and building out global channels.

These kinds of infrastructure projects may not seem sexy, but as on-chain systems get more complex, tools that can catch vulnerabilities early are definitely valuable. Especially for financial-grade applications, a single edge-case bug could mean tens of millions of dollars lost.