Tor turns to proof-of-work puzzles to defend onion network from DDoS attacks
https://www.theregister.com/2023/08/26/tor_tweaks_onion_routing_software/

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> The updated software, used to run Tor nodes, now supports a proof-of-work challenge called EquiX. Designed by Tevador, who developed Monero's proof-of-work algorithm, it is "a CPU-friendly client puzzle with fast verification and small solution size (16 bytes)."
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> It appears this computation will not go toward cryptomining, which some may feel is a lost revenue opportunity and others may welcome as an ethical necessity.
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GOOD. It is absolutely an ethical necessity.