Jameson Lopp & Nick Neuman: Bitcoin Key Management & Security

— Self-custody requires a fundamentally different security mindset than credit-based digital payments, since lost Bitcoin cannot be recovered like fraudulent credit card charges.

— Single-signature wallets present a single point of failure; multisig (multiple keys) eliminates that risk because losing one key does not result in loss of funds.

— Seed phrases introduce complexity and anxiety for most users; Casa's "seedless" model uses multisig so keys need replacing (not restoring) if lost, removing the backup burden.

— The $5 wrench attack (physical coercion) cannot be defeated by technical means alone; protection requires geographically distributed keys and service-layer safeguards like Casa's emergency lockdown and video verification.

— Decoy or duress wallets add complexity and false security; a better approach is key distribution across locations (e.g., phone, bank safety deposit box, Casa recovery key) that makes it impractical for an attacker to gather all signatures.

— Inheritance planning with multisig (Casa's diamond tier) avoids the "treasure map" problem by using a three-of-six setup where three keys become legally accessible only upon proof of death, ensuring heirs can recover funds without early exposure.

— Start with Casa's free single-signature mobile wallet or $10/month two-of-three multisig to experience key management without immediate risk; most users lose Bitcoin to their own mistakes, not theft, so simplicity is security.

— For holdings above a few thousand dollars, move to a distributed multisig setup (e.g., two-of-three or three-of-five) with keys in separate physical locations (phone, hardware wallet in bank safety deposit box, Casa recovery key) to eliminate single points of failure and defend against in-person attacks.

— Plan inheritance early using Casa's service-based approach (diamond tier) rather than writing convoluted instructions; this ensures heirs can legally access your Bitcoin after death without compromising your security while alive.