Coldcard Aftermath: What's Next for Bitcoin Security | Jade, Passport, Trezor, SeedSigner

— Four hardware wallet makers (Foundation Devices, Trezor, Blockstream Jade, SeedSigner) discussed fallout from the Coldcard vulnerability and what self-custody users should prioritize going forward.

— Multi-vendor multi-sig emerged as the strongest defense against single-device exploits; even one non-Coldcard device in a multisig setup would have protected users during this incident.

— Open source software and reproducible builds are now considered essential, but insufficient alone; security requires a combination of transparent development, code audits, bug bounties, and active security researcher engagement.

— Entropy generation remains debated: dice rolls offer repeatability and verifiability but create usability friction; mixing multiple entropy sources (chip RNG, host RNG, secure elements) provides defense in depth.

— Security is a journey, not a destination; users should start with education and software wallets, graduate to hardware wallets, and eventually move toward multisig as holdings and understanding grow.

— Distribution and fulfillment partners pose ongoing privacy risks; anonymous delivery, local meetup sales, and burner emails/addresses are practical mitigations, though no perfect solution exists.

— Prioritize free and open source hardware with reproducible builds that you can verify matches GitHub code; demand transparency in firmware updates, AI-assisted code reviews, and the vendor's relationship with security researchers.

— Move toward multisig across different vendors rather than relying on a single device; even two devices from different manufacturers eliminates risk from vendor-specific bugs and does not require dice rolls or extreme complexity.

— When purchasing hardware, use burner emails, PO boxes, local in-person pickup at Bitcoin meetups, or cash purchases where possible to minimize the exposure of personally identifiable information to fulfillment partners and shipping carriers.