is it currently possible to trade an actual security like an Apple-stock through DeFi? I would say no, since DeFi would have to access the TradFi ledger to legally change ownership. It is only possible:
(1) If Apple gives out a token that works like it’s stock in the first place
(2) To trade a synthetic version of the stock that has nothing to do with actually owning the stock.
Is this correct? Is there maybe a solution, that works similar to Tether, where the seller locks in the Apple-Stock with a CEX that gives out the representation in DeFi? If the buyer then wants to get the stock, the company changes the off-chain ownership in return for the token.