Imagine you want to declare your love for someone forever. You could write down your name and the name of your sweetheart on a padlock and affix it to the railings of a bridge, as it happens in Paris, Rome, Florence—even though you’d probably make municipal authorities and art historians very unhappy. Or… you could write a message into the bitcoin blockchain, making it eternal, uncensorable, independent, timestamped, and signed. Sound romantic?
The blockchain is the public registry that tracks all transactions in bitcoin. It’s a decentralized ledger, and over 5,000 copies of it are distributed all around the world, hosted by the nodes of the bitcoin network. The blockchain records who is paying whom; however, it is also possible to slip some extra data (such as text) into these records, the same way you can write down the reasons for a bank wire transfer you are sending.
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http://motherboard.vice.com/read/love-is-forever-when-its-written-in-the-blockchain
