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Coinbase - Bitcoin, safe and easy.
Two Factor Auth (2FA) - List of websites and whether or not they support 2FA
Binance - Cryptocurrencies exchange platform
Rapid 2FA - A painless way to add two-factor authentication to your site
Poloniex - US-based cryptocurrency exchange with maximum security
TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type