Im thinking like an micro chip implanted in our body. This system is not out of the picture because how we discover things every year, it is not impossible that in the future this things may happen and it will boom like btc.
Any objects or anything that is planted in our bodies has an effect that's not good, whether it's according to religion, for the owner, anyway vulnerable to the occurrence of the threatening danger, because of the evil-doer will assume that he's "the bank, which runs" this's not very effective.
Time continues to move forward, to offset the development of the era, every human being never ceases to create a variety of innovations including the media to pay.