Most cryptocurrencies will lose their value over time, and this is something that you should take into account when holding your currencies for the medium to long-term.If you are looking to keep your coins for a long time, you should do your research to ascertain which ones are suitable for such a purpose, and which ones are not. Currencies such as Ethereum, Monero, IOTA, and Dash are all considered leading coins and experience the most trade volume on a daily basis.You should be sure to follow each coins chart to identify low periods or times of stability and instability.