Blockchain can be generally thought of as a technology to securely store data, using unique properties of cryptography. Unlike traditional forms of record-keeping, they do not rely on a central source to store records, instead
distributing data across a network. Blockchains are the technical foundation of digital cryptocurrencies such as Bitcoin. Blockchains, both private and public, have a multitude of current and proposed applications beyond transactions – they can be used to authenticate persons and data, as well as serve as a basis for file systems and content distribution.
Although Technology is never the only solution to protecting and promoting freedom of expression, but It’s a powerful tool in enabling freedom of expression, but in the wrong hands, technology can also become an instrument of repression. Even where states or other actors promote or permit access to technology (such as blockchain technology) this does not absolve them from meeting their obligations under international human rights law.
Since blockchains are tools through which individuals can exercise their right to freedom of expression, this confers obligations on state and
private actors under international law to respect freedom of expression in their implementation.