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Just FYI. Wallets on exchange are not safe either. In fact they are more prone to attacks. Just be careful with that.

I prefer to sell and keep in BTC and ETH wallets if not Power Up. Coins.ph requires Google Authenticator codes.

Binance is safer than Bittrex I guess because Binance requires Google Authenticator codes to withdraw but fee is quite high. I am not sure if Bittrex do the same now. :)

I always enable 2 Factor Authentication.