A brokerage with a waiting period.
A sell order requires a one-line reason. The reason is posted to the public feed immediately, with the ticker and no name or amount.
The order is held for 24 hours. During that time you can cancel with one tap and no fee. The app shows you your own reason whenever you open it.
If the order is still standing after 24 hours, it executes at market on Robinhood Chain. The reason is marked executed in the archive.
Only sells wait. Nobody panic-buys at 3am. Actually, some people do. We are thinking about it.