Well you would only give them up willingly. If you don`t want to collect bitcoin duration on the side, you don`t need to. The blockchain can backtrack and make sure only one account per person.

A blockchain with file sharing should make this quite easy for willing participants to obtain supply.

You cannot avoid your heart beating my friend.
https://www.wired.com/insights/2014/06/heartbeat-may-soon-password/
https://www.technologyreview.com/s/613891/the-pentagon-has-a-laser-that-can-identify-people-from-a-distanceby-their-heartbeat/
https://thenextweb.com/artificial-intelligence/2019/07/05/the-pentagons-new-heartbeat-detection-laser-could-save-us-from-our-surveillance-horror/

As for what is bitcoin duration, it does not exist yet, I do see in the future why it is needed to keep the system going tho.
https://www.youtube.com/watch?v=jYJVG1fKnRo

It ends in mass killings of bot army's

Let`s say you could only have 1 account verified via fingerprint or iris or even heart beat(public anyways) to a bitcoin address and accumulated bitcoin duration, would you sign up?

Or lets say the coins you own already generate bitcoin duration coins, like POS forging kind of.



I would, all those metrics are given up every time I go out in public anyways.