U.S. crypto exchange Coinbase claimed that digital assets listed on its platform fall outside the U.S. Securities and Exchange Commission's (SEC) purview in its first legal response to the regulator's lawsuit. The SEC sued Coinbase at the beginning of June, alleging that a dozen of the cryptocurrencies offered through its wallet or trading platforms were unregistered securities. In its answer, filed early Thursday, Coinbase claimed that these cryptos are not investment contracts and therefore are not securities.