Proof your Mac is real.
A 30-day cryptographic certificate for high-value used Macs. The seller runs a notarized macOS app; the buyer verifies on receipt that the device they got is the device that was certified. $39, one-time.
Three steps. One device. One certificate that buyers can re-verify on arrival.
Notarized macOS app. Five-minute fast checks, then a 30–45 minute supervised burn-in for CPU, GPU, memory, and SSD.
The diagnostic payload is signed by the Mac's Secure Enclave. The seller shares macfax.com/r/{id} with prospective buyers.
On delivery, the buyer runs a 30-second check. If the enclave key matches the cert, the device is what was certified. If not, refuse delivery.
30+ checks across identity, spec, health, and tamper.
The same diagnostic Apple's authorized service providers run, plus sustained burn-in workloads tuned for the buyers who care: ML researchers, devs, and Mac Studio resellers. Every result lands on the cert, signed.
Read the full diagnostic stack →- Serial valid · Apple Coverage
- Activation Lock state
- Find My Mac
- MDM / DEP enrollment
- iCloud account state
- Chip variant + cores
- Memory size and type
- Storage size and type
- GPU core count
- Listed-vs-actual
- SSD wear, hours, writes
- Battery cycles (laptops)
- CPU sustained burn-in
- GPU MLX inference burn
- Memory 30-min memtest
- Logic-board ↔ chassis match
- Service History pane
- Secure Boot / SIP / FileVault
- Fan / thermal anomalies
- Enclave attestation
What software cannot prove — and we won't pretend otherwise.
A Macfax cert is a snapshot of the device's technical state, signed by the device itself. It cannot certify cosmetic condition, prior liquid exposure, whether the case has been opened, or repair history beyond what's in the macOS Service History pane. We say so on every cert.
A PDF report can be re-used on a different device. A Macfax cert can't.
The cert is signed by the Mac's Secure Enclave key, fused to the logic board. On receipt, the buyer re-attests in 30 seconds. If the enclave key doesn't match, the cert fails — and the deal stops at the doorstep.
Macfax | PDF inspection report | Apple Coverage Check | |
|---|---|---|---|
| Verifies the serial is real | |||
| Catches case-swap fraud | — | — | |
| Diagnostic burn-in | partial | — | |
| Buyer re-verifies on receipt | — | — | |
| Tamper-evident signature | — | — |
$39 once. Free for the buyer. No subscription.
- Hardware-attested via App Attest
- 30-day cert with re-issue option
- Buyer re-attestation included free
- Refund within 60s if cert generation fails
- Re-attests the device's enclave key
- Compares against the cert's signature
- Returns match or mismatch in plain language
- If mismatch — refuse delivery
Common questions.
- What does $39 actually cover?
- One signed cert, valid 30 days from issuance. Re-issuance is free within 14 days for the same Mac. Buyer verification is always free.
- What if my Mac fails the diagnostic?
- Automatic refund within 60 seconds. We don't issue a cert for a Mac that doesn't pass — and we don't charge you to find out it didn't.
- Why isn't this just an Apple service?
- Apple has every primitive needed but hasn't shipped a P2P verification product. We're filling the gap until they do — or until they don't.
- How does the buyer verify on receipt?
- They open the cert URL, click "Verify on receipt," and run the 30-second check. The same notarized app re-attests the device's enclave key. If it matches, the cert is valid. If not, refuse delivery and contact the seller.
- What happens if a cert is contested?
- MVP-tier dispute handling is by email; we mediate between buyer and seller using the cryptographic evidence on file. Higher-tier dispute kits are post-MVP.