Many well-known altcoins did not survive this winter. Altcoins are all about making money. Many technologies cannot support hacking attacks. But when we invest, we still think about choosing to invest in altcoins. Because altcoins can bring us considerable profits in the short term. Bitcoin can only be used as a store of value. I believe in Bitcoin like I believe in gold. Therefore, more considerations will be made when investing in altcoins. Caution is necessary. Your money only you know the loss or profit.