One of the great value propositions of blockchains is the transparency that such public ledgers offer. There are many cases though where it is desirable to conduct private transactions. In this article, we want to introduce you to four concepts that aim to increase the level of privacy for transactions on public blockchains. It is a common misconception that cryptocurrencies are private. Most of them are pseudo-anonymous, meaning that real-world identities are not connected to addresses by default, but can be connected through ongoing data analysis.