The SEC's Report of Investigation found that tokens offered and sold by a "virtual" organization known as "The DAO" were securities and therefore subject to the federal securities laws. The Report confirms that issuers of distributed ledger or blockchain technology-based securities must register offers and sales of such securities unless a valid exemption applies. Those participating in unregistered offerings also may be liable for violations of the securities laws. Additionally, securities exchanges providing for trading in these securities must register unless they are exempt. The purpose of the registration provisions of the federal securities laws is to ensure that investors are sold investments that include all the proper disclosures and are subject to regulatory scrutiny for investors' protection.

https://www.sec.gov/news/press-release/2017-131