“CardanoWall allows you to send a message to the Cardano blockchain in the easiest way possible, without delving into technical details. Your message will stay there forever and nobody can ever delete or change it. The most logical application is to make concrete the proof of the existence of documents. You can simply select files on your computer and the browser will calculate their unique hash sums. If you send those sums to the blockchain, this will be proof that such a document already existed at the moment of sending the message. It can also be used to simply congratulate someone for their birthday or anniversary, to speak about yourself, or share your thoughts. There are many applications of the Cardano blockchain and you already have the tools to utilise it right in front of you!”

https://cardanowall.com/en/

Source: reddit.com

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