This is what I've heard too.

When credit cards came my parents told me that this has been the fulfillment of that verse. However, technology keeps on innovating day by day and the one that I believed was the microchip implanted to the wrist or forehead.

With crypto's today, it's not yet widely accepted so I doubt it.

For the mark of the beast, there's one idea that I've heard before that it was going to be another religion.