Yes it's a great idea, and in the OP article he asks "Is anybody working on this?" The answer is yes - there is a proof of concept illustrated in this article:

Yes it's a great idea, and in the OP article he asks "Is anybody working on this?" The answer is yes - there is a proof of concept illustrated in this article: https://www.pirateparty.org.uk/party-magazine/who-made-could-digitally-registered-images-be-future-creators https://www.pirateparty.org.uk/party-magazine/who-made-could... And others are working on this as a service for many uses, including signing artwork, see BT Proof, for example: https://www.btproof.com/ https://www.btproof.com/