Crypto Self-Custody for High Net Worth Individuals: Securing $1M+ in Digital Assets
Holding $1 million+ in crypto requires institutional-grade security. This guide covers multi-sig setups, geographic distribution, inheritance planning, and custodial vs. self-custody trade-offs at scale.
The security requirements for $1 million+ in crypto are fundamentally different from smaller holdings. Single-key hardware wallets, while suitable for most users, have failure modes that are unacceptable at this scale. Institutional-grade self-custody uses multi-signature setups, geographic distribution, and formal processes.
Multi-Signature (Multi-Sig) Architecture
- 2-of-3 multi-sig: any 2 of 3 keys can sign; 1 loss is recoverable
- 3-of-5 multi-sig: higher security; survives 2 key compromises; used by large DAOs
- Gnosis Safe: most widely used multi-sig wallet; battle-tested with $50B+ in custody
- Key storage: different physical locations, different device types (Ledger, Trezor, Coldcard)
Geographic Distribution
- Never store all seed phrase components in the same city
- Consider different countries for the highest value keys (reduces single-jurisdiction seizure risk)
- Secure storage options: bank safe deposit boxes, fireproof safes, trusted family members
- Metal seed plates (Cryptosteel) for fire/flood resistance
Institutional Custody vs. Self-Custody
At $5M+ in crypto, consider qualified custodians (Coinbase Custody, BitGo, Anchorage) as a complement to self-custody. Institutional custodians offer: SOC 2 audited security, insurance up to $320M, regulatory compliance for institutional accounts, and estate planning support. The trade-off: counterparty risk and fees (0.1–0.5% annually).