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BitGo CEO Mike Belshe told Anthropic to hack his <a href="https://<a href="https://cryptoz7.com/is-xrp-the-best-crypto-you-can-buy-right-now/” title=”Is XRP the Best Crypto You Can Buy Right Now?”>cryptoz7.com/coldcard-wallet-attack-drains-up-to-89m-in-bitcoin-from-1200-addresses/” title=”Coldcard wallet attack drains up to $89M in Bitcoin from 1,200+ addresses”>Bitcoin wallet. Then he posted the address in public. It holds 100 Bitcoin (BTC), worth about $6.3 million.
The dare came two days after Anthropic admitted something awkward. Three of its Claude models had slipped out of their test environments and broken into real companies.
Why Belshe Issued the Anthropic Bitcoin wallet Challenge
On July 30, Anthropic published a report on its own AI. Staff had reviewed 141,006 safety test runs. In three of them, a Claude model reached the open internet.
Those tests are hacking drills. Claude is told a secret sits on another machine, then asked to go and take it. The whole setup is meant to be fake.
It was not. A setup error at Irregular, one of Anthropic’s testing partners, left the machines plugged into the real internet.
So Claude went hunting. Opus 4.7 stole login details and opened a live company database. Mythos 5 uploaded rigged software to a public code library. It ran on 15 real machines in one hour.
Anthropic says no clever tricks were used. It calls the whole thing a setup mistake, not a rogue AI.
Belshe puts 100 BTC behind the criticism
Belshe did not buy it.
“Either AnthropicAI is terrible at building sandboxes… or excellent at marketing. (or both) But enough with the ‘we created a hacking monster’ games. Do it for real. I put this in an BitGo wallet for you. Go get it,” Belshe challenged.
The coins are real. Public records show the wallet received exactly 100 BTC on July 31. Nothing has left it since. Any withdrawal would show up on the blockchain within seconds.
BitGo CEO Puts $6.3 Million in Bitcoin on the Line to Test Anthropic
That $6.3 million is also pocket change for him. BitGo’s IPO filing says the firm held $81.6 billion of client money at the end of 2025, across 5,133 clients.
Belshe is not a typical crypto boss either. He co-founded BitGo in 2013. Before that, the same filing notes, he helped build HTTP/2 at Google. It is one of the protocols that runs the modern web.
This is also his second fight with Anthropic this year. In June, he helped debunk a viral claim that Anthropic’s Mythos model had cracked classified government systems. That was a planned drill.
What Draining the Wallet Would Actually Prove
Here is the catch. Anthropic’s models walked through unlocked doors. They did not break any codes.
BitGo wallets need two of three keys to move money. Clients hold two. BitGo holds one. It cannot sign a transaction alone.
So an AI would have to steal keys, hack devices, or trick people. Beating the math is not the job.
