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Hardware Wallet Supply Chain Attack Leads to $100 Million Theft, Former Mt. Gox CEO Mark Karpelès Reveals Ledger Attack Details

Odaily News: According to Bitcoin News monitoring, Bitcoin News released a podcast in which former Mt. Gox CEO Mark Karpelès and Foundation CEO Zach Herbert discussed the largest supply chain attack in crypto industry history. Mark Karpelès stated that he discovered the spy implant 3 weeks before the funds were stolen and contacted Ledger, but received no response. The implant had a built-in hidden cellular modem that could directly read the seed phrase on the screen and passed Ledger's own checks; even setting a passphrase could not prevent the seed phrase from being stolen. Mark Karpelès said that with $5 million, he could create an implant that would only be detectable through X-ray. The episode also discussed the hardware wallet reseller model, the Malaysian reseller behind the attack, on-chain tracking of stolen crypto assets, the spread of the attack to Europe, why Trezor was not targeted, hardware wallet security, and multi-party computation solutions. The episode timeline shows that the amount stolen from hardware wallets reached $100 million, with $86 million transferred out within 24 hours.

AI Could Break Encryption Algorithms, Ethereum Researchers Call for "Bunker Mode"

According to Cointelegraph, Ethereum researcher Justin Drake warned that the rapid advancement of AI could accelerate mathematical attacks against the Elliptic Curve Digital Signature Algorithm (ECDSA), potentially breaking existing cryptographic systems within months under the worst-case scenario, and called on the industry to initiate "bunker mode"—transferring assets to new addresses with previously unexposed public keys to mitigate risk. Several industry insiders, however, expressed reservations. Coinbase Chief Cryptographer Yehuda Lindell stated there is currently "no evidence" that the mathematical assumptions underpinning ECDSA have been weakened; Trezor Bitcoin analyst Lucien Bourdon similarly noted that migrating assets could backfire and inadvertently create opportunities for scams. MetaMask founder Taylor Monahan was even more direct, asserting that if elliptic curve cryptography were truly compromised, "the entire world would go to zero," rendering bunker mode ineffective. Meanwhile, Ethereum has laid out a post-quantum roadmap based on hash-based signatures and ZK proofs, while public blockchains such as Solana and NEAR are also exploring their own quantum-safe alternatives, though concrete deployment timelines remain unset.

Approximately 233,000 Bitcoin moved as a precaution, with around $15 billion involved following the Coldcard exploit

Odaily News: After a firmware vulnerability in Coldcard hardware wallets was exploited, approximately 2,100 Bitcoin were stolen, with losses nearing $130 million. On-chain data shows that in the days surrounding the incident, wallets held by long-term holders transferred out approximately 233,000 Bitcoin, valued at around $15 billion. Casa CEO Nick Neuman stated that some of the transferred funds came from Coldcard users migrating to multi-signature wallets, with Ledger and Trezor users also taking similar measures after the event. During the same period, approximately 22,000 Bitcoin were transferred into exchanges. Coinkite has advised users who generated seed phrases using firmware versions 4.0.1 through 4.1.9 to treat their wallets as compromised and immediately migrate to new seed phrases. These versions cover the period from March 2021 to July 2026. (Decrypt)

Trezor: Approximately 10% of Global Crypto Users Self-Custody Their Private Keys

hardware wallet company Trezor stated there is a distinction between Bitcoin self-custody and holding Bitcoin credit exposure. When users store assets on exchanges, brokerages, or funds, they are actually relying on third-party ledger records and withdrawal arrangements. The company noted that after the full implementation of new EU crypto regulations, some exchanges that failed to obtain licenses in time have stopped offering regulated services to EU users. Trezor stated that its founders Marek Palatinus and Pavol Rusnák launched the first hardware wallet 12 years ago, moving private keys from internet-connected computers to dedicated devices. Trezor explained that private keys are generated on the device and never leave it, with transactions being signed inside the device before being sent. Trezor CCO Danny Sanders previously stated that if users put Bitcoin into ETFs and call it Bitcoin ownership, it would be one of the worst outcomes for the industry. Trezor estimates that among approximately 600 million global crypto users, about 10% self-custody their private keys, and around 12 to 13 million people use hardware wallets.

Trezor Exec: Putting All Bitcoin into ETFs Might Be the Worst Outcome for the Industry, Undermining the Core Principle of Self-Custody

: Danny Sanders, Chief Business Officer of hardware wallet manufacturer Trezor, stated that "putting everything into ETFs" might be the worst development path for the Bitcoin ecosystem. Since the launch of US spot Bitcoin ETFs in early 2024, cumulative inflows have exceeded $53 billion, making them a significant driver of BTC prices, but also potentially altering the structure of how users hold their assets.Sanders believes that over-reliance on ETFs will weaken Bitcoin's core principle of "self-custody," gradually shifting asset control to third-party institutions instead of users holding their private keys. Although self-custody carries risks such as lost seed phrases or unrecoverable private key leaks, he considers these more of a psychological barrier than a technical challenge, adding that "it's not difficult once you actually start doing it."Data shows that out of approximately 600 million crypto users globally, only about 10% practice self-custody, and only around 12 to 13 million users employ hardware wallets.As an early hardware wallet provider in the industry, Trezor helped popularize the BIP-39 seed phrase standard and continues to advocate for lowering the barriers to self-custody through improved user experience and educational tools, rather than relying on intermediary custody.Sanders concluded that the industry's long-term goal should be to gradually approach a Web2-level user experience, rather than simply replacing self-custody with ETFs. "That would probably be the worst possible outcome for the entire industry." (The Block)