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Bitcoin has radically changed the way we view transactions of digital assets and value. The decentralised nature of the blockchain is the base for its main strengths: security, transparency, trustworthiness and immutability. The game changed after the Bitcoin Core version 0.9.0 update in March 2014 when the OP_RETURN field was added. The OP RETURN field is an instruction of the Bitcoin scripting language which allows users to attach metadata to a transaction and therefore save it on the blockchain.