Legally he must inform in advance if he indents to sell large amounts.
According to what laws? BTC isn't a security and Craig Wright is not a company insider. He doesn't need to disclose anything under any law I've ever heard of.
There's no such thing as "insider trading" with BTC so he doesn't need to use
a 10b5-1 plan or anything like that. And if he were trying to comply with Rule 10b5-1, his little social media FUD doesn't meet the requirements.
Right, he doesn't really need to atm - there is no regulation in place.
But to be save u might deduct things from standard regs, like for (finite) stocks - where u can calc e.g. thresholds and more, and must report such stuff in most juristictions.
That's kind a proactive due dilligence.