How do I check if a used GPU was mined on?

Enter the serial at cvin.org/en/check (hashed locally, never uploaded) — in 30 seconds you get the public history: sustained high-load telemetry, listing and rental records, liens. Mining damage is temporal; snapshots can't show it, history can.

Seller never registered — no record found. Now what?

Ask them to spend 5 minutes registering free at cvin.org (serial is hashed locally and never uploaded). Willingness to register is a good-faith signal; refusal should raise your guard.

FREE TOOL · PRE-BUY CHECK

30 seconds before you buy that used GPU

The serial is hashed locally in your browser — never uploaded, never leaves this page. You instantly get the CVIN and the public registry verdict: history, liens, conflicting operator claims. Free, no signup.

Serial number

Model

The serial never uploads. Same local SHA-256 truncation as the declare form: serial → browser hash → only the hash is sent. Your serial is the most sensitive asset datum you own; we never touch the plaintext.

Found / not found — what to do next

Has history

Device is registered

You'll see observation count, identity level, last activity and risk signals. Next: full record (free /r/ page), or a $2 official verification report — numbered, signed, independently verifiable, printable for large deals.

No history

Device not in registry

Doesn't mean it's bad — it means no operator or observer has ever vouched for it. The strongest move isn't walking away: ask the seller to spend 5 minutes registering (free; only the hash uploads). A seller who registers and matches is a good-faith signal; one who refuses tells you something too.

Script

Copy-paste for the seller

Ask for a verifiable history, not a verbal promise — mining damage is temporal and snapshots can't show it, history can.

Hi — before I pay, I'd like a quick verification: please go to cvin.org/en/check, enter this card's serial (hashed locally, never uploaded) and send me the device record link. A public, verifiable history is what lets me buy with confidence. Registration is free and takes 5 minutes. If the card has a long high-load history or existing liens, please disclose upfront.

I'm a miner · ROI calculator Why history beats benchmarks