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It took a year to ship WebAssembly in Anubis

Original article
anubis.techaro.lol|338 points|170 comments|by xena|Sep 6, 2026

The Journey to WebAssembly in Anubis

You have encountered this screen because the site administrator has deployed Anubis to defend the server against the aggressive scraping tactics employed by AI corporations.

The Problem

When AI companies scrape websites indiscriminately, it often leads to server instability. Websites stay online →\rightarrow→ Websites experience downtime, rendering resources unavailable to every visitor.

The Mechanism: Proof-of-Work (PoW)

Anubis implements a PoW system inspired by Hashcash (a method originally designed to curb email spam). The core logic is based on the computational cost of access:

Total Cost=∑(Computational Effort×Number of Requests)\text{Total Cost} = \sum (\text{Computational Effort} \times \text{Number of Requests})Total Cost=∑(Computational Effort×Number of Requests)

User TypeComputational LoadImpact
Individual HumanNegligibleUnnoticeable delay
Mass ScraperMassiveProhibitively expensive

The Long-Term Strategy

This PoW page is merely a temporary placeholder. The ultimate goal is to refine fingerprinting techniques to identify headless browsers—for instance, by analyzing specific font rendering behaviors. Once perfected, legitimate users will bypass the challenge entirely.

Security Concept

Technical Requirements

To proceed, your browser must support modern JavaScript. Certain security extensions may interfere with this process.

Required Actions:

  • Enable JavaScript in your browser.
  • Disable JShelter or similar restrictive plugins for this specific domain.
// Conceptual PoW check
if (client.solveChallenge(difficulty)) {
    allowAccess();
} else {
    showChallengePage();
}

"This necessity arises because AI companies have fundamentally altered the social contract regarding how website hosting operates."