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.
That's possible. Since cryptocurrency works as a digital currency, they can manipulate the microchips by storing datas and information from it. And as we are looking in modern technologies, scanning a raw data is so easy. In my opinion, maybe 5-10 years from now. Who knows right?