A Cryptocurrency startup named Currency.com based in Belarus has recently launched a securities trading platform allowing individuals to invest in equities, commodities, and indices with their crypto holdings of Bitcoin or Ethereum.
This startup currently has over 150 tokenized securities and eventually plans to roll out 10,000 different tokenized securites to their customers.
Investors are able to purchase these issued tokens with their cryptocurrency, meanwhile the tokens they purchase perform identically to the assets listed on NASDAQ.
I doubt SEC or any other government institution will allow that.
When talking about stocks or any other traditional investment, legal certainty is one of the most important aspects. If there is any sort of legal complication, you may just lose your stocks. This is very risk in my opinion.