In Tor I don't know how PoW is used.
Bitcoin is different. PoW is the goal of the game of signing a block. Every miner competes to complete the PoW before the others, and the first who completes wins and appends the next block. You cannot move this schema to relays. There is no "competitive game" to publish the next note or anything similar.
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But it works. People wait the 10 minutes and the spam is filtered.
And with Tor it's basically the same as with email except with coders that did it instead of writing a paper saying it wouldn't work ๐
Interesting. I will search and read about that.
But I don't think you can wait 10 minutes of intensive computing on a smartphone to just send a message - it would make nostr unusable, and onboarding almost impossible.