“As an entrepreneur and founder of Mr. Bitcoin, a company that installs Bitcoin ATMs in the Netherlands and Belgium, Wismeijer had a 2 millimeter by 12 millimeter NFC Type 2 compliant NTAG216 RFID chip injected into the muscle tissue between his index finger and thumb on each hand. One he uses to store and overwrite common, everyday data, such as contact details, while the other holds his encrypted Bitcoin wallet key. After his doctor in Amsterdam understandably refused to perform the procedure, Wismeijer says he turned to a professional piercing artist to do the deed. Wismeijer is already planning to use his chips as keys to NFC-enabled door locks at his home.”
http://www.slashgear.com/man-injects-bitcoin-wallet-nfc-chips-into-his-hands-16355694/