We can start with payment. What would someone pay with? Credit/debit numbers can be stolen. Checks can be stolen or forged. Cash can be counterfeit. What form of transaction has zero chance of fraud?
To make transactions available to people you need to introduce systems that can have fraud in them. There is a balance between availability/ease and fraud.
Bitcoin. It can easily be confirmed as valid (zero chance of counterfeit), and is otherwise a bearer instrument with no further settlement, and impossible to reverse (like cash).
We can start with payment. What would someone pay with? Credit/debit numbers can be stolen. Checks can be stolen or forged. Cash can be counterfeit. What form of transaction has zero chance of fraud?
To make transactions available to people you need to introduce systems that can have fraud in them. There is a balance between availability/ease and fraud.