Data privacy has been an important issue, especially over the last few years. Ethereum and other blockchains have had an ongoing problem with the lack of privacy. The European Union (EU) approved a law in 2016, the General Data Protection Regulation (GDPR), that is currently enforceable. It is considered to be one massive step towards protecting and preserving user privacy. Not only does it affect companies with offices in the EU but also organizations throughout the world that have users from the EU. Further, it mandates key obligations for organizations handling user data, in addition to introducing new rights for individuals - for instance, the right to erasure represents a challenge to the immutable nature of a blockchain.