$BTC Many people consider BTC as a stock, which is a mistake. BTC is absolutely secure because there is no developer behind it, all of its transactions only have code and do not need to go through the exchange, alt coins follow the trend of digital currency, but there are still developers, so all transactions are stored and the possibility of assets being frozen or investigated is very high. So BTC can only go up, when there is no non-state currency to replace it.

Even $ETH , the second-ranked currency, is still run by a junkie named Vitalik Buterin, all eth transactions are not absolutely anonymous.