The methods described herein are configured for authenticating a user identity. Fingerprint data is collected from a digit via a fingerprint sensor and heartbeat data is collected from the digit, via an optical heartbeat sensor, based on light projected from a light source. The collected fingerprint data is verified by comparison to stored fingerprint data associated with the user identity. The collected heartbeat data is used to detect the presence of a heartbeat. Based on a successful verification of the collected fingerprint data and a successful detection of the heartbeat, the user identity is authenticated. Authenticating the user identity based on both fingerprint data and heartbeat data enhances the security of the authentication process by preventing fraudulent use of fingerprints.