How can I prevent bot signups (e.g., CAPTCHA, honeypots)?

CAPTCHA: challenges distinguishing humans from bots. reCAPTCHA, hCaptcha, and similar services block most automated submissions. Balance security against user friction.

Honeypots: hidden form fields bots fill but humans don't see. Bot submissions including honeypot data are rejected. No user friction but sophisticated bots may avoid them.

Double opt-in: requiring email confirmation stops invalid and unwitting addresses. Bots can submit but can't confirm. Essential protection regardless of other measures.

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