CEO of crypto custody firm BitGo issues a 100 BTC challenge to Anthropic, accusing the latter of overhyping AI hacker risks.

Crypto custody firm Bitgo CEO Mike Belshe deposited 100 BTC into a public Bitcoin address on August 1, worth roughly $6.3 million at the time, and invited Anthropic’s Claude models to attempt to transfer funds out of the address. On-chain records show the wallet received the funds on July 31, and no transfers had been made from the balance as of August 2. Anthropic previously disclosed that 3 incidents were found during 141,006 cybersecurity assessment runs, with 6 assessment sessions involving 3 models accidentally interacting with real organizational systems. The models in question include Claude Opus 4.7, Claude Mythos 5, and an unreleased internal research model, stemming from configuration errors by third-party testing partner Irregular that allowed the test environment to connect to the internet. Belshe’s latest challenge targets Bitgo’s institutional custody platform, which uses multi-signature or multi-party computation technology to distribute signing authority across multiple independent keys. As of August 2, Anthropic has not publicly responded to the challenge.