The proof problem in used Macs.
A used Mac listing is a wall of unverifiable claims: "2023, 32 GB, no issues, never opened." Buyers discount the listing or walk; sellers drop price to compensate. A Macfax report turns those claims into a tamper-proof record any buyer can verify in 30 seconds. That asymmetry shows up in price and time-to-sale.
Free to run · $49 per Mac to publish · Money-back guarantee
Verified Macs close faster, for more.
Sample of 47 sold Mac Studio M3 Ultra (512 GB / 4 TB) listings across eBay and Swappa, last 30 days. We surface data, not advice. Sellers can decide what's worth doing.
verified listings sold in 4.1 days median vs 9.8 days unverified
same condition, same model year; verification correlates with the listing holding its ask
messages-per-listing before close, sample n=47
Signed at the source. Verified on receipt.
The seller runs the diagnostic on their Mac and publishes a report URL. The buyer, on the Mac that arrives, re-derives the same device-key fingerprint. If they match, the hardware is the same. If they don't, something changed.
- Runs full diagnostic
- Signs with Secure Enclave
- Publishes report
- Hardware-attested record
- Open to anyone
- Issued by Macfax
- Re-runs the attestation
- Compares fingerprints
- Confirms · or refuses
The cryptography is doing the work. Neither side trusts the other; both trust Apple's Secure Enclave, and Macfax stores the result. The protocol is open. Anyone can verify a report without us.
What a Macfax report does that screenshots can't.
Can't be screenshotted
Buyers anchor on the real report URL. A screenshot is just an image; without the URL, it doesn't certify anything. The report on macfax.com is the trust anchor.
Can't be replayed
Each report is bound to a single Mac's Secure Enclave. A buyer can re-derive the fingerprint on receipt; if the hardware was swapped, the fingerprint won't match.
Can't be forged
Apple's App Attest signs every report. We don't take anyone's word; not the seller's, not the buyer's, not our own.
$49 per Mac. Free to run. Money-back guarantee.
The diagnostic is free to run. Pay only when you publish a report URL you can share. If a report doesn't help your listing close, refund.
Free to run · $49 per Mac to publish · Money-back guarantee