Securities and Exchange Commission (SEC) Chair Gary Gensler reiterated that Bitcoin is not a security.Gensler cited the approval of spot Bitcoin exchange-traded funds (ETFs) as evidence of its non-security status.Gensler believes most cryptocurrencies, aside from Bitcoin, are securities and should be regulated by the SEC.Dogecoin creator Billy Markus urged Gensler to declare Dogecoin a non-security, arguing that it shares similarities with Bitcoin.