Loved this idea when I first heard about it. Really excited to see it is a reality. I just uploaded my first work for registration and it looks beautiful! (It was quick, easy and painless too!)
Pros:
Clean, clear interface, beautiful UX, Bitcoin blockchain <- key differentiating factor for me!
Cons:
None that I have encountered so far for its core use case of artwork registration.
Really looking forward to seeing you guys grow!
