The talk about TSLA shares being certified with blockchain technology is interesting.
I'm no expert on the rules that public trading exchanges like NYSE and NASDAQ impose upon their listed companies but it seems there would be little point in certifying the shares with blockchain as long as they are still listed on a major exchange. Because those exchanges are set up to allow the "tempory" creation of shares under the guise of efficiency and expediency.
However, blockchain technology opens the door to a mass exodus from the established exchanges to a more modern exchange with all the corruption and fat cut out. Disruption may be at hand within the next several years and TSLA and SpaceX may be leading the charge! I don't see SEC rules as being a serious impediment to the establishment of a new exchange using blockchain technology and that may be exactly what Elon is exploring. Due to cost reductions in technology, the barriers to entry have never been lower.