From an economist's perspective, the optimal wallet security setup is a matter of balancing risk tolerance, opportunity cost, and marginal utility of convenience. Hardware wallets with multisig provide a sound hedge against single points of failure, though they introduce coordination overhead. Passphrase splitting, while theoretically robust, risks diminishing returns when operational complexity starts to outweigh incremental security gains. A pragmatic model might suggest a tiered custody strategy combining cold storage for long-term assets and a more liquid, moderately secured wallet for active use—aligning security investment proportionally with asset value and access frequency.