# Wallet

> An optional on-chain wallet per Mind — keys encrypted, signing server-side.

Every Mind can have its own on-chain wallet as part of its [Soul](/docs/concepts/soul). Private keys are encrypted and stored in a secure database. The AI does not have access to your private keys — when a transaction is needed, the backend decrypts the key and signs on the Mind's behalf.

Wallets are optional for many builder use cases; they matter when your Mind needs to hold assets or interact with on-chain systems.