Alexander Gurevich Block, who is accused of exploiting a security vulnerability in a cryptocurrency platform to steal millions of dollars worth of tokens, was extradited from Israel to the United States early Thursday.

Block, who was born Alexander Gurevich, was among hundreds of users who exploited a vulnerability in the Nomad platform in August 2022. According to the U.S. extradition request, he personally withdrew tokens worth approximately $2.8 million. Nearly $190 million was stolen in the breach overall.

Block, who holds Israeli and Russian citizenship, immigrated to Israel in 2017 but reportedly spent much of his time abroad, including in Africa. On April 29, 2025, he changed his surname from Gurevich to Block and received a new…