Wouldn't the problem be solved with some kind of blockchain? Maybe, one day, finally, in the distant future, we can have a use for the blockchain!
You see, the thing with blockchains, yeah, is that they, yeah, *downs glass*, they secure all the transactions yeah? *waves two fingers at bartender*, longest chain and all that yeah? no one will mess wiv you if you keep long chains bruv *collapses in drunken stupor*