None of the cryptos are sound money ("money not liable to sudden appreciation or depreciation in value") except stablecoins on Ethereum. Bitcoin can easily lose 80% of its value in a month and no one would be surprised. Bitcoin is the biggest speculative bubble of all time. It absolutely has no utility (imagine if Bitcoin disappeared now - what would the world lose?).
The actual real exciting stuff regarding the cryptos is here: https://ethereum.org/en/dapps/