> Cryptocurrencies? Aka the least private form of transactions, where not only the sender and receiver know, but the whole block chain immutably stores for ever

> Cryptocurrencies? Aka the least private form of transactions, where not only the sender and receiver know, but the whole block chain immutably stores for everyone else to view? There are cryptocurrencies like ZCash, Monero, Zano, Freedom Dollar, etc. that are sufficiently private.