With just your heart, you might be able to access upcoming Apple devices.

Apple’s patent shows an iPhone that will measure ECG in the future, but Apple Watch measures ECG already.
Apple is working to make passwords, Touch ID and Face ID obsolete. In the future, unlocking your device could be as simple as holding a new iPhone or letting your Apple Watch detect your unique heartbeat. Apple Watch’s ECG app monitors the unique rhythm of each heart. Apple recently filed a patent that describes a method for identifying users by their unique cardiovascular measurements. You can unlock your devices with this technology if you continue to wear your Apple Watch. Verifying your heart patterns rather than a password or fingerprint scan increases your security and speeds up identification. You need to enter a passcode on your Apple Watch to unlock your Mac. You could unlock your Mac by putting on your Apple Watch and taking an ECG. You can unlock other devices if you leave your watch on. Two points of contact are required to take an ECG. Apple Watch sensors are located at the back and digital crown of the watch. Touching the digital crown while launching the ECG app creates a circuit which allows the heart to measured. Apple’s patent describes an innovative approach to iPhone design which would allow it authenticate by using heart rate simply by holding the iPhone normally. The iPhone’s entire exterior would be transformed into a device that measures heart rate. The patent also discusses the use of ECG data to detect “mood” in a user. Apple uses the example of measuring heart characteristics while working out and then playing music that matches the beats per minute. A user could stream a faster-paced track when they need to work harder or automatically play a slower-paced track during a cooldown. The patent was credited Gloria Lin, Taido Makajima Pareet Raul and Andrew B. Hodge. Lin is credited with a number of patents including the identification of users based on biometrics.