Should not things like this be possible thanks to the blockchain, if the business is open with what adresses it uses.
It does not have to reveal who of for what the adresses are used?

And making fake claims is not even possible, because you would have to prove that you did a certain transaction and proving
that is possible since a user can prove they own a sending adress by moving coins in and out of it.


Now with Bip 16 this business could create mirror adresses, owning only half of the acess to that adress.
The other half could be spread out to different persons.
 
The other key could be spread out to different persons.
Is there not also things like this that OT can solve?