You tried this approach?
How is it working for Tor?
https://blog.torproject.org/introducing-proof-of-work-defense-for-onion-services/
xtoshi
npub1vh…uay96
2025-03-25 12:48:34 UTC
in reply to nevent1q…x7yn
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npub1vhr3lrqksmuys4rhxk8hx4jsqetv779dd567270pk2j99rh62ynqfuay96Seen on
wss://nos.lol