Enterprise-grade document verification. Your files never leave your device. Powered by Polygon.
Documents Verified
Organizations
Uptime
Three simple steps to tamper-proof document verification
SHA-256 hash computed locally in your browser. Your document never leaves your device.
Hash checked against Polygon smart contract. Immutable, transparent proof.
Verified, revoked, or not found — in under 2 seconds.
Your documents never leave your device. We only see a 64-character hash — a mathematical fingerprint that cannot be reversed. Even we can't read your files.
const hash = SHA256(file);
// 64-char fingerprint
"a7ffc6f8bf1ed766..."
// File never leaves device
// Only hash sent to chainWhen someone verifies a document, they see this — instant trust.
Document is authentic
Verified Institution · iith.ac.in
Official Seal
Indian Institute of Technology Hyderabad
SHA-256 Hash
0xa3f8b2c9d4e71f6823a9b5c0d8e4f1a2b7c6d5e4f3a2b1c0d9e8f7a6b5c4d3e2
Tiered trust levels for every type of issuer
Verified Business
Verified Institution
Verified Individual
Government Entity
Your Document Wallet
Save verified PDFs, show and verify documents in person, and scan QR codes for instant verification — all from your pocket.
Degree Certificate
IIT Hyderabad
Start free, upgrade when you need more. Verification is always free.
For individuals getting started
Need custom pricing? Contact us
Integrate document verification in 3 lines of code with our SDK.
$ npm install @proofcrest/sdk
import { verify } from '@proofcrest/sdk';
const result = await verify(file);When you upload a document, we compute its SHA-256 hash on your device. This hash is then checked against the Polygon blockchain. If an organization has registered that exact hash, we show who registered it and when. The document itself never leaves your device.
Yes, 100% free, forever. Verification doesn't cost us gas fees (it's a read-only blockchain query). We want maximum adoption — free verification drives trust in the platform.
No. ProofCrest handles all blockchain interactions behind the scenes. Organizations get custodial wallets, and the platform pays gas fees. Users never interact with crypto.
Even a single byte change produces a completely different hash. This is by design — it ensures that only the exact original document will verify.
We use Polygon (formerly Matic), an Ethereum Layer 2. It offers low gas fees, fast finality (~2 seconds), and full EVM compatibility.
Join 500+ organizations already using ProofCrest for blockchain-powered document verification.
Start Free — No Credit Card Required