chris 8b1e89cf04 Lower ALTCHA cost to 2000
50000 was taking >1 minute on some devices. 2000 should be ~1-2s in
most browsers while still being meaningful work for bots. The HMAC
key and expiration are the real security — cost is just friction.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-13 19:23:55 -04:00
2026-06-13 19:23:55 -04:00
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