"Mr. Bitcoin" will never forget where he left his wallet. It's implanted under his skin.

The Amsterdam-based Bitcoin entrepreneur, whose real name Martijn Wismeijer, turned himself into a real-life cyborg by having a miniature digital communications chip implanted in his hand.

He posted a video of the procedure on YouTube:

Wismeijer and his compatriots got tiny NFC chips injected into their hands. NFC, which stands for near-field communications, is the same type of technology built into the Apple Pay digital payment system and numerous Android devices.

NFC is a short-range wireless system that allows devices to send data back and forth, enabling the user to make mobile payments or send commands to other smart devices.

The chip that "Mr. Bitcoin" used was developed by a company called Dangerous Things. According to the company's Indiegogo campaign, its inventor, Amal Graafstra, had the first model implanted into his own hand by a surgeon in 2005, and got a second upgraded model injected a couple of months later using a pet chip injector assembly. Wismeijer used the same type of injector to have the miniature device slipped under his skin.

Dangerous Things' implantable NFC chip in bioglass capsule.

Dangerous Things

"The xNT [chip] is a 2mm x 12mm, fully NFC Type 2 compliant RFID tag encased in a cylindrical Schott 8625 bioglass ampule and sterilized in ethylene oxide gas," according to the Dangerous Things Indiegogo page.

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Man becomes human Bitcoin wallet with chip implanted in hand