A passphrase-protected private keyA private key is a cryptographic number that allows individuals to sign transactions and create new receiving addresses for their... Read More is a type of digital signatureA digital signature is a cryptographic mechanism designed to provide proof of authority and authenticity in electronic form. In blockchain... Read More that uses a cryptographic keyCryptographic keys are mathematical values used to encrypt and decrypt data using cryptographic algorithms. Private keys (known only to the... Read More to protect the information in a blockchain transactionA blockchain transaction is a digital recording of an event or action stored in a public, decentralized ledger. A blockchain... Read More. The private key signs the transactionA transaction is a record of an event that occurred in the past. Transactions typically occur during the course of... Read More, and the passphrase verifies the signature.