ZenGo, a mobile app to manage your cryptocurrencies, is about to launch a Visa debit card in the U.S. This isn’t the first crypto-powered debit card — Coinbase announced a U.S. expansion for its debit card just last week. But ZenGo is a non-custodial wallet, which means that you’re in control of your crypto assets. When you leave your crypto assets on an exchange, somebody could log in to your account and send your assets to other wallets. Sure, there are some security features, such as email validation and two-factor authentication….