Separate Hot and Cold Wallet Infrastructure
You must never expose your treasury-level wallets directly to internet-facing APIs. If your main vault is permanently connected to the web, you are just one exploit away from total bankruptcy. The architecture here must be ruthless and absolute: your hot wallets should only hold the bare minimum capital required to handle daily operational liquidity. The vast majority of your treasury reserves must be locked in cold wallets, kept entirely offline, and completely severed from any external network exposure.

Use Multi-Signature Authorization
Critical treasury actions must never rely on a single point of failure. You must enforce strict multi-signature authorization, requiring multiple approvals, segregated approvers, and mandatory hardware signing for any major transaction. Absolutely no single employee, regardless of their rank or tenure, should ever have the unilateral power to control treasury withdrawals, execute reserve movements, or hold total settlement authority.

Use Hardware Security Modules (HSMs)
Your private keys should never sit exposed as plaintext inside your application's memory. If an attacker manages to compromise your server and dump its RAM, they shouldn't find your treasury keys waiting for them. To prevent this, you must secure your keys fundamentally at the hardware level by utilizing Hardware Security Modules (HSMs), secure enclaves, or Multi-Party Computation (MPC) custody infrastructure.