Actually, you won't have to have a chip implanted in you for that. Think of it this way: all of your financial info is kept on a blockchain, and your palm is your private key. By swiping your palm you basically sign a transaction, and a certain amount is deducted from your balance.
Yes, that's what I meant in the first place. This would be somewhat convenient for the average person as it won't be necessary to carry bulky wallets or even a mobile device to conduct transactions worldwide. The implant will contain your utmost sensitive information, easily accessible and controllable by governments worldwide. With nanotechnology on the rise, this seems to be the way of the future. Cashiers may disappear by then, as AI would take control of everything. People would simply stand in the "Self-Checkout" line in order to swipe items on the machine and use their hand to fulfill the payment. This would be something similar to what Walmart has right now (but without the need for credit cards or cash). Your hand will act as the private key, to unlock the funds for a specific transaction.
I think, technically, we can do it today already. And I wouldn't be scared of some "evil corporations" taking advantage of that. With right implementation of blockchain technologies it's more like ordinary people would be able to control corporations, than the vice versa.
We'll see. Everything will depend on how much people are willing to adopt Blockchain technology for their own benefit. If big corporations manage to get ahold of Blockchain tech for transforming our current economic system, then they'll largely dominate the worldwide economy as we know it. Imagine if all governments worldwide would agree to use one global currency for daily transactions. They'll be able to easily track & trace suspicious activity within the Blockchain, allowing them to freeze accounts or restrict access to user's funds in a much more efficient manner than physical cash. With this in play, a "New World Order" would become a reality within the future. AI will also play a huge part in ensuring everything behaves as intended.