First of all "controlling digital assets" is a solution in search of a problem, for a majority of people anyway. Secondly, in order for that to be even remotely possible, the first thing that is needed is trust. You can't replace that by any algorithm.

Trust isn't there, and for good reason. Rug-pulls are rampant. Entities that present themselves as solvent one day fall down like a house of cards the next day. It is the Wild West, complete with gamblers, snake-oil salesmen, and bandits, and the sheriff is just another bandit.

The major "innovation" crypto brought has been in leveraging psychological manipulation techniques previously used by cults and sects in order to quickly part foolish people from their money. The math part is just a distraction.