Casa CEO：Coldcard漏洞后23.3万BTC转移

Bitcoin Magazine

Casa CEO Nick Neuman: 233k BTC Moved To Safety After Coldcard Exploit Proves Self-Custody Resilience

Casa CEO Nick Neuman pointed to onchain data from the recent Coldcard firmware exploit as evidence that self-custody strengthens Bitcoin’s resilience as an asset class.

In an X post on Aug. 9, Neuman cited figures showing that in the days after the Coldcard hack, where approximately 2.1k BTC was stolen, 22k BTC moved to exchanges and 233k BTC left long-term holder wallets in on-chain transactions, according to data by Checkonchain. “The onchain metrics around the Coldcard incident reinforce how important self-custody is to the resilience of Bitcoin as an asset class,” Neuman wrote.

DATA BY CHECKONCHAIN

Galaxy Research has tracked confirmed losses from the Coldcard entropy flaw as low as 1.7k, ranging to more than 2k BTC. The stolen coins are tracked across multiple attack waves beginning July 30, with higher estimates approaching $130 million. The vulnerability stemmed from a March 2021 firmware issue that weakened seed generation on certain Coldcard models.

Neuman said Casa’s own customer conversations indicated that some of the 233k BTC movement reflected holders shifting from non-Coldcard single-key setups (such as Ledger or Trezor) into multisig wallets after reassessing single-key risk. Other flows involved multisig users removing Coldcard devices from their keysets.

“So somewhere between ~10x-100x the amount of bitcoin stolen was moved to safety as people sounded the alarm,” he wrote. “This is a giant flashing neon sign showcasing the resilience that self-custody adds to the network.”

Neuman contrasted the outcome with a hypothetical centralized custodian breach. In that scenario, he argued, the numbers would likely reverse: limited funds might escape while the majority would be lost in a single event. With self-custody, attackers had to target individual wallets, limiting the scale of any single success and giving holders time to react.

“If all that BTC was held at a custodian and the custodian was hacked instead, those numbers would have been flipped,” Neuman stated. “As it was, the thieves had to crack one wallet at a time (and are still going), earning a little BTC each wallet, instead of cracking one wallet and getting a massive payday.”

He concluded that self-custody benefits not only individual holders but the Bitcoin network itself by distributing risk and preserving confidence.

Casa, founded in 2018, provides multi-signature vault solutions aimed at higher-value holders and institutions seeking practical self-custody. Bitcoin Magazine has previously covered the company’s multisig products and Neuman’s views on sovereignty and institutional adoption.

The Coldcard incident has prompted renewed discussion across the industry about single-signature hardware wallets, key generation practices, and the relative merits of multisig and emerging covenant-based vault designs. Onchain data cited by Neuman suggests that, whatever the technical shortcomings of specific devices, the ability of holders to move funds independently limited the systemic impact.

This post Casa CEO Nick Neuman: 233k BTC Moved To Safety After Coldcard Exploit Proves Self-Custody Resilience first appeared on Bitcoin Magazine and is written by Juan Galt.