Daniel Marin is tackling one of the internet’s trickiest challenges: validating a user’s identity without exposing sensitive information to hackers. His startup, Nexus, which has raised $27 million, built a product called Nexus zkVM, which uses a combination of cryptography, computer science, engineering and mathematics to prove you are you—through protective software as opposed to passwords or personal information. The software relies on a cluster of computers called the Nexus Network, which do the heavy lifting behind the scenes. “There has been an explosion of advancements on the scientific front, on the engineering front and most importantly on the market front,” he says. “This allows us to build a for-profit company [around] this technology.” zkVM, which is currently free, was released in June and is used by more than 120,000 people and 15 companies.

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