Abstract: A digital asset custodial system for maintaining custody of, and controlling access to, cryptocurrencies and/or other digital assets, is disclosed. The digital asset custodial system includes multiple layers of security to enable large volumes of digital assets to be maintained in a secure manner. The digital asset custodial system can include a combination of biometric-based multi-user validation, transaction risk analysis, and a hardware security module (HSM) that provides authentication/validation functionality and secure storage of private keys of digital assets.