cost 100 → 50000: was solvable in milliseconds by a bot, now takes ~1-2s in a real browser, making mass automation impractical. expiresAt 10min: embeds expiry in the HMAC-signed challenge so the server rejects replayed tokens without needing to store seen challenges. ALTCHA_HMAC_KEY must be set to a strong secret in production. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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