[neals]

Bitcoin would work perfectly well without datacenters. The client is all you need, you can run it on your computer.

I'm talking about the people from VISA that have to store and maintain accountholders data. None of this exists for Bitcoin.

[biot]

Each bitcoin transaction needs to be verified by a majority of the network in order to mitigate the risk of a fraudulent transaction. Does the energy required to do this exceed Visa's per-transaction energy requirements?