Report Claims $40M in Bitcoin Stolen After 500 Coldcard Wallets Hacked

A circulating report claims that roughly $40 million in Bitcoin was stolen after about 500 Coldcard hardware wallets were compromised, an allegation tied to the wider “Coldcard hardware wallet hack” narrative that remains unverified and should be treated as a claim rather than a confirmed finding.

What the report claims happened

The core allegation centers on a large, coordinated loss of Bitcoin held on Coldcard hardware wallets. Public reporting has framed the event around a wallet drain in the tens of millions of dollars, with Coldcard issuing a warning tied to its MK3 device as experts examine the incident. For related coverage, see Bitcoin ETFs Break $500 Million Losing Streak as BlackRock Inflows Lead Recovery.

The headline figures, about $40 million across 500 devices, come from a report rather than an official post-mortem. The exact dollar amount attached to the drain has been described elsewhere as closer to $38 million, so the precise total remains unsettled. For related coverage, see Bitcoin Holds $64K Support as Meme Coins Steal Weekend Focus.

How the alleged Coldcard compromise may have unfolded

Details on the mechanism are thin. One account describes a rapid theft, with 594 bitcoin drained in roughly 15 minutes, a speed that points toward automation rather than manual, wallet-by-wallet theft. For related coverage, see SoFi crypto revenue hits $1.2M in Q2.

What is inference, not confirmed fact: a single incident touching hundreds of devices would typically suggest a systemic weakness, a supply-chain issue, or a shared point of failure rather than isolated user error. No cited source in the available evidence establishes the precise attack path, so that reasoning stays a hypothesis.

Bitcoin engineer Jameson Lopp weighed in on the wallet-drain discussion on X, part of a broader effort by researchers to piece together what actually occurred. Coldcard’s own MK3 firmware and download page is the reference point for users checking their device status.

Why the claim matters for Bitcoin self-custody users

A reported breach involving a well-known hardware wallet brand carries weight beyond the affected holders because self-custody rests on the assumption that these devices keep private keys isolated. An alleged eight-figure loss raises the stakes well past a minor, one-off theft.

While details remain unverified, holders can reasonably watch for official Coldcard advisories, confirm they are running current firmware, and treat unsolicited “recovery” or “urgent update” prompts with suspicion. These are general precautions, not a response to a confirmed exploit.

The story also touches hardware wallet trust more broadly, a theme relevant to readers tracking how large holders custody their Bitcoin and to those following Bitcoin’s shifting risk backdrop. Until an independent post-mortem confirms the scale and cause, the safest framing is that this is a serious allegation still awaiting verification.

Disclaimer: This article is for informational purposes only and does not constitute financial or investment advice. Cryptocurrency and digital asset markets carry significant risk. Always do your own research before making decisions.