Privacy is important because it supports freedom, dignity, autonomy, justice, and democracy, and therefore it is important that privacy is studied in ontologically robust ways. A form of privacy is implemented in the right to be forgotten, which is a human right established by the European Court of Justice. Blockchain and Holochain are examples of recently emerged technologies that were shaped by, and are now shaping of, social contexts in which economic transactions may occur. The right to be forgotten represents a compliance challenge for public and private implementations of blockchain technology. This paper describes a few of these challenges.