I would think it should be possible for recording devices such as cameras and phones to encode digital signatures, with said signature tracked to the buyer’s device. With subsequent copies, another would be added by the device, much like a blockchain.
It’s got its limits, but it would help.
Excellent ideas, both of you.
Carry_Okie suggests building security (basically SSH certificates) into all future cameras / microphones / etc. While a good idea, I suspect this wouldn’t be practical and wouldn’t solve the problem of existing hardware.
Bob434 postulates a passphrase. This could work well.
I already offered 2-factor, either phone or authenticator app (as goodnesswins suggests).
They are already using facial recognition, fingerprints, and voice recognition as methods to unlock smart phones. It would not be hard to use this tech to created a unique one off hashed encrypted token that could be shared only with the important sites like banking and medical portals. But I would not want it connected to my real person for any other accounts anywhere else. So I would have to have two, one used as an anonymous token. But if someone stole your phone...
I had a talk with a friend of mine, who is working on a business venture. He said a new exchange method is in the works, uses a blockchain like technique to verify the money is real, and makes transaction costs less than a penny.
It could help with some of this.
It could make debit cards obsolete. All digital, of course.
It is said to be much, much cheaper than the current banking method of moving money.