This Article describes method for passphrase validation and wallet access control in Bitcoin software wallets using a block-based Time-based One-Time Password (TOTP) mechanism. Unlike traditional TOTP systems, this approach leverages blockchain data—specifically, Bitcoin block height and block hash—combined with a securely stored secret to derive a dynamic 6-digit validation code. The system enables user-friendly, secure access to a wallet without directly exposing or requiring the user to memorize a fixed passphrase.