How to implement captcha for new account signup

Mastodon instances seem to attract a good number of spammy bot registrations. Interested to hear if anyone has been successful implementing a captcha at signup, and how you did it. Self-hosted is fine, mods to code are fine. Working on it ourselves at the moment but interested to hear from others.

Thanks!

No one else has worked on this? Seems like it has come up in conversation at least a few times.

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