Less spam.
Less friction.

A self-hosted ALTCHA proof-of-work demo. Your browser solves a challenge; the server checks it once before accepting the submission.

This test sends only the challenge response and honeypot field. No enquiry is stored and no email is sent. Challenges expire after three minutes and cannot be reused.

Keep honeypots, server validation and rate limits. Proof-of-work increases the cost of automated spam; it does not prove a visitor is human.