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Marty Bent highlights Block Inc.'s integrated Bitcoin ecosystem, which includes Cash App, Square, and BitKey. Cash App offers zero-fee trading for Bitcoin transactions over $2,000, while BitKey provides a 2-of-3 multi-signature hardware wallet with on-screen verification.
Block's BitKey wallet uses a two-of-three multi-signature model split between a physical key, a smartphone application, and the company. Jack Mallers recommends BitKey as an optimal hardware custody solution for beginner Bitcoiners.
Block's Bitkey team discovered that the attacker exploited the vulnerability by pinging a centralized API provider to identify target addresses, a finding they have reported to law enforcement. A mix of malicious actors and white-hat hackers are currently sweeping vulnerable funds.
BitKey, a Bitcoin wallet from Block, simplifies self-custody and offers a 10% discount using the code TFTC10.
Rob Hamilton recommends moving funds to trusted exchanges like River, citing its in-house custody and proof of reserves, or immediately acquiring other hardware wallets like Ledger or BitKey as emergency measures.
BitKey is a multi-signature product by default, using three keys generated across different hardware and software stacks (Block server, phone, hardware device) to provide diversity, but it lacks independent verifiability for some key generation processes.