I came across this as often look at great domains to see what's there and was very pleasantly surprised.
I think this is an amazing idea and they are using the bitcoin blockchain
perfect for sealing your idea whether graphics, concept or whatever without wasting tons on trademark, copyright crap
a welcome addition I think!
https://www.proof.com/best of all free, or a tiny fee on blockchain
makes easy for people not as tech savvy as some