In 2013, someone embedded a tribute to Nelson Mandela into the Bitcoin blockchain.

How? By using a feature called OP_RETURN, which lets users write a small piece of text into a transaction (limited to 80 bytes).After Mandela passed away in December 2013, a user encoded a short message memorializing him directly into a Bitcoin transaction.That message is now forever stored on the blockchain immutable and censorship resistant.

This shows how the blockchain can be used not just for money, but as a form of permanent public record kind of like digital graffiti on the wall of the future.

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