---
title: "Discussion on \"The bot problem that CAPTCHA can't solve, and proof of human can\" | Hashnode"
description: "Discussion on \"The bot problem that CAPTCHA can't solve, and proof of human can\". reCAPTCHA asks if you look human. Proof of human asks if you're unique. Different questions, different attack surfaces. Here's why it matters."
url: "https://hashnode.com/posts/captcha-cant-stop-sybil-attacks-proof-of-human-can/6abdeaf5b712493925002e32"
---

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Discussion

# [The bot problem that CAPTCHA can't solve, and proof of human can](https://devabkk.hashnode.dev/captcha-cant-stop-sybil-attacks-proof-of-human-can?utm_source=hashnode&utm_medium=feed)

reCAPTCHA asks if you look human. Proof of human asks if you're unique. Different questions, different attack surfaces. Here's why it matters.

Oct 1 · 7 min read · devabkk.hashnode.dev  
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-   [#websecurity](https://hashnode.com/tag/websecurity)
-   [#captcha](https://hashnode.com/tag/captcha)
-   [#authentication](https://hashnode.com/tag/authentication)
-   [#security](https://hashnode.com/tag/security)

## Written by

[Lewis Gilchrist](https://hashnode.com/@lewis-dev)

@lewis-dev · London, UK

  
[View profile](https://hashnode.com/@lewis-dev)

Sharing my thoughts regarding the emergent technologies related to Digital Security and Digital Privacy.

learning about zero-knowledge proofs and decentralized identity, one confusing whitepaper at a time.

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