According to CoinMeta, the public comment period for the proposed "Cryptocurrency Regulation" by the U.S. Securities and Exchange Commission (SEC) concluded on Tuesday. The Center for Policy Innovation (CPI) submitted a letter of opinion, calling for clearer rules regarding whether tokens are subject to securities laws, airdrops, token buybacks, and secondary market intermediaries. The CPI also advocates for making the proposed safe harbor more operational, while former SEC enforcement officials and other commentators advocate for withdrawing the proposal.