My cryptocurrency portfolio mostly involves Bitcoin With some Ethereum, Litecoin, and Ripple as diversification. The amount I have invested in cryptocurrencies compared to my total portfolio is way too high right now. This is why I only invest €100 each month into Bitcoin at the moment. I do not buy €100 at once but I buy €10 every three days to dollar cost average even more. I buy my Bitcoin on Coinbase and transfer occasionally to my hardware wallet to keep them even safer.