A private key is a secret code that allows the user to prove their ownership of their Bitcoins. Every Bitcoin address has a matching private key, which is saved in the wallet file of the person who owns the balance.

The private key is mathematically related to the Bitcoin address and is designed so that the Bitcoin address can be calculated from the private key, but importantly, the same cannot be done in reverse.

Please keep your private keys safe, and make periodic backups to prevent the loss of your Bitcoin.