# Verify an ALTCHA challenge on the server

Canonical source : [Verify an ALTCHA challenge on the server](<https://sebastien.rigaux.be/en/tech-watch/links/verify-an-altcha-challenge-on-the-server>)

The documentation explains generating a single-use challenge and cryptographically verifying the widget response. It separates browser responsibilities from backend verification.

- Selected on : 2025-05-27

- Entry updated : 2026-10-14T07:00:28+0000

- Format : Documentation

- Source language : EN

Original resource : [Verify an ALTCHA challenge on the server](<https://altcha.org/docs/integration/server/>)

Tags : [Security](<https://sebastien.rigaux.be/en/tech-watch/tags/security>) · [Forms](<https://sebastien.rigaux.be/en/tech-watch/tags/forms>)

Available versions : [Français](<https://sebastien.rigaux.be/veille/liens/verifier-un-challenge-altcha-cote-serveur>) · [English](<https://sebastien.rigaux.be/en/tech-watch/links/verify-an-altcha-challenge-on-the-server>)

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