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 In my case, it’s for a website where users can post pseudonymously via a randomly generated Nostr keypair. Nostr isn’t the focus, just the means of communication. So my relay needs to filter by kind (easy) but I also need PoW enforcement to prevent spam. 
 Getwired.app does this. Would your app be similar to it? 
 Thanks, but not quite. My work-in-progress site will allow users to compare two, randomly selected Magic the Gathering cards and pick one. I’m going to use a custom kind number, empty content, and the payload choice information will be tags.

Way back in the day, like 20 years ago, there were sites that let users pick among images like this. One was called thefairest<dot>info. The other I recall was thefunniest<dot>info.

Of course, by allowing anon visitors to post images, they didn’t last forever. I’m thinking can bring back the concept in limited form by using a curated image set and deterring spam with Proof-of-Work. 
 That sounds fantastic.