It's a nice idea.

 I don't think they intend to do this but you can imagine them expanding into other topics and whitelisting sources in a similar way. Kind of a regression from Google, but probably gets rid of a lot of noise.

k00b

I like the author filter. It's a cool way to discover posts on a particular subject from those most informed on a topic.

It still lacks a lot of sources and could use a logo or something.

bitcoinnym

This is cool, I just tried a common term
https://bitcoinsearch.xyz/?q=HTLC&size=n_50_n