2Zcash/Monero
These two cryptocurrencies are technically very different, but they’re bundled together here as they aim to solve the same problem: anonymous transactions.
Although often seen as a currency for the darknet and a way to launder money, Bitcoin’s blockchain is in fact quite transparent; every single transaction is logged and public, and anyone can see how the money moved around. Bitcoin’s protocol itself allows for a degree of anonymity, and there are ways to further anonymize Bitcoin transactions, but they aren’t perfect.