I was struck when we incorporated our company and raised financing how much we still use ink and paper to keep track of things like corporate ownership. When signing so many documents I wanted to seal them with paraffin wax and send them to our lawyers via carrier pigeon. In the case of Facebook, a multi-billion dollar company, it seems amazing that someone can come out of the woodwork and with a little effort in doc…
It is called escrow, and it is a longstanding industry.
In order for it to help, a company or individual would need a way to say, "only contracts held in escrow are valid from the period from x to y" and have it hold up in court.