OTPZ is a Laravel package simplifying secure one-time password (OTP) implementation for first-factor authentication. It allows users to log in using a temporary code sent to their email instead of a traditional password. Key features include rate limiting, configurable expiration times, and one-time use validation for OTPs. OTPZ also offers session locking and failure attempt limits to enhance security. Developers can customize email templates and access auditable logs for OTP activity.