OnionFlation: Turning Tor’s Proof-of-Work Into a DoS Cannon

Tor’s proof-of-work shield was supposed to save onion services from being crushed by ddos attacks. Instead, a pack of security researchers just turned that shield into a wrecking ball—by inflating the PoW difficulty level researchers were able to deny users access to a tor hidden service.

J Jonah Jameson

Mar 11, 20267 min read

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J Jonah Jameson

@Just_The_Facts_JJJ

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Jameson is a veteran reporter best known as the outspoken editor-in-chief of the Daily Bugle in New York City. Jameson built a reputation for aggressive reporting, and an uncompromising belief that the press should hold powerful figures accountable.

Joined March 11, 2026 New York City

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