Verify a 3D Model

Drop any file or paste its SHA-256 hash to check whether it's registered in our directory. No account needed — works forever.

Drop any 3D file here

STL, OBJ, STEP, 3MF, or any format — we compute the SHA-256 in your browser, nothing is uploaded.

or paste a SHA-256 hash

Computing SHA-256…

How verification works

Every file uploaded to ModelDirectory.org is fingerprinted with SHA-256 — a one-way hash that uniquely identifies the exact bytes in a file. We store that fingerprint (never the file itself for verification purposes) alongside the upload date and creator.

When you drop a file here, your browser computes its SHA-256 locally — the file never leaves your device. We then query our database for that fingerprint. If it matches a registered model, we show you when it was first registered and whether the registration is anchored on the Polygon blockchain.

Blockchain anchoring means the fingerprint was written to an immutable smart contract on Polygon mainnet. Even if ModelDirectory.org shuts down, that on-chain record remains verifiable via Polygonscan.