To the best of my knowledge (and I'm well known as a hater) they are actually audited by auditors. [1]

> "Audit reports of the GUSD reserve are published monthly by an independent registered accounting firm, BPM LLP."

[1] https://www.gemini.com/dollar

To quote the comment I linked to:

> GUSD's site claims audits - under a heading titled "Review the Gemini dollar reserve-funds independent accountant audits" but links to attestations (example: https://assets.ctfassets.net/jg6lo9a2ukvr/3ZfEIugZkOLsArm4JK..., "conducted in accordance with attestation standards").

Good lord. Thanks for letting me know.