First of all, beautiful site. I'm happy to see nuxt projects in the wild, and especially happy when they're this beautiful. I really like the iconography and illustration styles and how nicely it blends with the content. Your UI is stellar.
On the technology side, the page explaining what Blockstack is reads poorly. You use the same subheads a few times to ask that question, but don't really answer it. It feels like an afterthought, which is unfortunate as it was my first stop on the site.
It seems like the "how" of this tool is a big deal to you. Why is the data being stored the way it is? How can you better tell that story? Can you use the same level of awesome you use on the features page?
And finally, if you can't add a working demo to the site due to the blockstack platform, you can still record video demos that highlight different features. Keep that sweet animation style in your video work and you've got some really enjoyable content.
I hope your project takes off. Cheers.