Jane Street leads $105M funding for Antithesis, a testing tool used by Ethereum network. Antithesis said its Series A will scale deterministic simulation testing, replaying complex failures exactly for crypto and other always-on systems. What to know: * Jane Street led Antithesis' $105 million Series A and is both an investor and a customer. * The Ethereum network used Antithesis to stress-test conditions ahead of The Merge. Antithesis, a Northern Virginia startup pitching itself as infrastructure for never-down software, raised a $105 million Series A led by Jane Street, a bet that stress-testing distributed systems matters as much for blockchains as it does for high-speed trading. The company's platform uses deterministic simulation testing, running large-scale, production-like simulations to surface the kinds of edge cases that can blow up in live networks, Antithesis said in a press release Wednesday. When a failure hits, Antithesis said it can replay the bug exactly, helping engineers isolate issues without the usual can't reproduce limbo, a familiar pain point for crypto protocols where small glitches can cascade into chain instability. Other investors in the funding round include Amplify Venture Partners, Spark Capital, Tamarack Global, First In Ventures, Teamworthy Ventures and Hyperion Capital, alongside individuals such as Patrick Collison, Dwarkesh Patel and Sholto Douglas, the company said. Antithesis has leaned on crypto credibility, saying the Ethereum network used its simulations ahead of The Merge to model extreme conditions and catch vulnerabilities before the proof-of-stake transition. The company also cited customers across finance, AI, blockchain and data infrastructure, and said revenue rose more than 12x over the past two years. Antithesis said it will use the proceeds to expand engineering, increase automation, scale go-to-market globally and push distribution through channels including AWS Marketplace. AI agents are now capable enough to identify exploitable weaknesses in smart contracts, and could already be used by attackers to weaponize those flaws, according to new research from Anthropic's Fellows program. Researchers said that as AI models get cheaper and more capable, automated hacking could spread from decentralized finance (DeFi) exploits to a wider range of software and critical infrastructure bugs. AI Disclaimer: Parts of this article were generated with the assistance from AI tools and reviewed by its editorial team to ensure accuracy and adherence to its standards. For more information, see CoinDesk's full AI Policy. Commissioned by GoPlus * As of October 2025, GoPlus has generated $4.7M in total revenue across its product lines. The GoPlus App is the primary revenue driver, contributing $2.5M (approx. 53%), followed by the SafeToken Protocol at $1.7M. * GoPlus Intelligence's Token Security API averaged 717 million monthly calls year-to-date in 2025, with a peak of nearly 1 billion calls in February 2025. Total blockchain-level requests, including transaction simulations, averaged an additional 350 million per month. * Since its January 2025 launch, the $GPS token has registered over $5B in total spot volume and $10B in derivatives volume in 2025. Monthly spot volume peaked in March 2025 at over $1.1B, while derivatives volume peaked the same month at over $4B. The world's largest asset manager released its AI report with a bearish outlook on U.S. bonds and the country's economy, and presented a bullish projection for crypto adoption. * BlackRock envisions a future where institutional adoption of cryptocurrencies accelerates due to U.S. economic fragility and increased government debt. * The asset manager's suggests traditional financial hedges are failing, prompting a shift towards digital assets like bitcoin as alternative investments. * BlackRock highlights the growing importance of tokenization and stablecoins as bridges between traditional finance and the digital economy.

Antithesis raises $105M in Series A funding. Antithesis, a Tysons Corner, VA-based deterministic simulation testing company, raised $105M in Series A funding. The round was led by Jane Street with participation from Amplify Venture Partners, Spark Capital, Tamarack Global, First In Ventures, Teamworthy Ventures, Hyperion Capital, and individuals including Patrick Collison, Dwarkesh Patel, and Sholto Douglas, alongside other new and returning investors. Jane Street is both an Antithesis investor and customer. * Expand engineering teams to strengthen its deterministic simulation engine. * Advance platform intelligence and autonomy. * Build a sales and marketing organization. * Scale GTM operations across North America, Europe, and Asia. * Deepen availability through cloud channels, including AWS Marketplace. Led by CEO Will Wilson, Antithesis provides a new way to validate that software works correctly before it is released, driving a fully deterministic, massively parallel simulation that tests years of real-world production in a few hours. It explores codebase and injecting common faults to ensure the system always behaves as intended. The company says that the platform perfectly reproduces any bug it finds in its environment for rapid debugging.

/PRNewswire/ -- Antithesis today announced a $105 million Series A round led by Jane Street, the global technology-driven quantitative trading firm known for...