How do I know that my private keys, and “hot” and “cold” wallets, are secure?

Balance ensures that your private keys are secure by generating and managing them on dedicated hardware, throughout their entire lifecycle. The hardware managing the offline (i.e. "cold")  wallets is kept offline in bank-grade vaults that are access controlled, monitored, and guarded  24/7. The hardware ultimately managing the warm wallets is provided by a cloud infrastructure provider and physically kept in a data center subject to similar protections and restrictions.