Dutchman Martijn Wismeijer is very cautious when it comes to storing Bitcoin – so much so that in 2014, he had two NFC (near field communication) chips surgically implanted into each hand to store his encrypted Bitcoin keys.
Wismeijer stated a number of reasons for the drastic method of storing crypto, saying he had lost the majority of his Bitcoin over the years to exchange failure, hacking, and theft.
“I can safely say most of the bitcoin, more than 80 percent, I have lost due to hacks, thefts, exchanges gone bad and other problems. If I would’ve had the chip in 2010, I’d probably be a rich man by now.”
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https://samcrypto.com/bitcoin-skin-people-using-subdermal-microchip-wallets/
