Prove you made it first. SHA-256 hash + Polygon blockchain proof + visual watermark. Certify any file in 30 seconds — your file never leaves your device.
react open-source cryptography typescript smart-contracts blockchain provenance polygon solidity sha256 web3 proof-of-existence vite digital-notary vercel content-authenticity creator-economy ip-protection anti-deepfake file-authentication
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Updated
Apr 24, 2026 - TypeScript