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The story of the Dutch Martijn Wismeijer, who made this procedure public in 2014, is followed by many.

The Dutch Martijn Wismeijer is very cautious when it comes to storing Bitcoin, so much so that in 2014, he stored two NFC chips (Near Field Communication) implanted surgically in each hand to store his Bitcoin encrypted keys.

Wismeijer stated a number of reasons for the drastic method of storing crypto, saying that he had lost most of his bitcoins in recent years due to exchange failures, hacking and theft.

I can safely say most of the Bitcoin, more than 80 percent, I have lost it due to hacks, thefts, failed exchanges and other problems. If I had the chip in 2010, I probably was already a rich man. "

However, Wismeijer was also simply curious about the idea of ​​storing her digital currency under her skin. He told IBTimes in 2014:

I did it because I wanted to experiment with strong bitcoins using subdermal implants because I thought that would be the Holy Grail of contactless payments. "

They did the procedure in a body piercing study, which he recommends to anyone who wants to do the same. The chips are made from glass and measure 2 mm x 12 mm end to end, that is, they are the size of a small grain of rice. Wismeijer said the process was less painful than an injection, and noted that the procedure is similar to the one carried out to put the pets' safety chip.

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The NFC chips store 888 bytes of data each, which is sufficient for the storage of 26 encrypted Bitcoin address keys. Wismeijer says she uses her chips every day to make purchases: the process is to scan the chips with her smartphone to receive and then decrypt the keys to make a transaction. Keys can be removed and replaced with new keys for other cryptocurrencies remotely with a smartphone, and encryption prevents people from simply scanning Wisemeijer's hands to read their keys.

Due to the attention he received, he never stores large quantities in the chips to avoid being targeted by thieves, but he says he is not the only one who stores digital coins in this way. Wismeijer owns Mr. Bitcoin, a company that installs Bitcoin ATMs.

After appearing on the news, many of his employees followed in his footsteps. Wismeijer says she knows "at least 50" people in the Prague area who only use sub-thermal bitcoin wallets.

While the method may seem drastic, the security of Bitcoin is a major problem. According to some reports, up to 23% of all Bitcoin have already been irreversibly lost, which makes people take their security very seriously. Although approved by the FDA (Food and Drugs Administration), the process apparently is not free of risks, since there are certain studies that link NFC chips with cancer. However, the health risks do not deter all, as many people continue to follow the example of Wismeijer taking this maximum security precaution to protect their bitcoins.

You can see in this video how was the procedure:

https://www.youtube.com/watch?v=B9HcFxTM8hI