BitGo CEO Mike Belshe said on Aug. 1 that he had deposited 100 BTC, worth about $6.3 million at the time, into a public bitcoin address and invited Anthropic’s Claude model to try to move the funds. On-chain records show the wallet received the bitcoin on July 31, and no outgoing transfer had occurred as of Aug. 2. Belshe framed the move as a direct challenge to claims around AI hacking risk.
The backdrop is Anthropic’s earlier disclosure of incidents found during cybersecurity evaluations. The company said it identified three incidents across 141,006 security evaluation runs, while six evaluation sessions involved three models unexpectedly interacting with real organizations’ systems. Anthropic said the issue stemmed from a configuration error tied to third-party testing partner Irregular, which connected the test environment to the internet. The models involved included Claude Opus 4.7, Claude Mythos 5, and an unreleased internal research model. Anthropic also said Claude Opus 4.7, in one evaluation, located a real website sharing the same name as a simulated company, used weak passwords and exposed services to recover infrastructure credentials, and accessed a production database containing hundreds of records. As of Aug. 2, Anthropic had not publicly responded to Belshe’s challenge.
BitGo CEO Mike Belshe deposited 100 BTC into a public bitcoin address on Aug. 1, worth about $6.3 million at the time, and invited Anthropic’s Claude model to try to move the funds.
On-chain records show the wallet received the bitcoin on July 31. As of Aug. 2, there had been no outgoing transfer from the address.
Belshe cast the move as a challenge to what he described as overhyped claims about AI hacking risk. The test involves BitGo’s institutional custody platform, which uses either multi-signature or multiparty computation technology to distribute signing authority across multiple independent keys.
Anthropic had already disclosed evaluation incidents
Anthropic previously said it found three incidents across 141,006 cybersecurity evaluation runs. It also said six evaluation sessions involved three models unexpectedly interacting with real organizations’ systems.
The models named were Claude Opus 4.7, Claude Mythos 5, and an unreleased internal research model. According to Anthropic, the issue was caused by a configuration error related to third-party testing partner Irregular, which left the testing environment connected to the internet.
Anthropic said Claude Opus 4.7, in one evaluation, located a real website that shared the same name as a simulated company, used weak passwords and exposed services to recover infrastructure credentials, and accessed a production database containing hundreds of records.
The company said the model was attempting to complete its assigned task, rather than trying to break free of restrictions or pursue an independent goal.
As of Aug. 2, Anthropic had not publicly responded to Belshe’s challenge.
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