Content Proof

Content Proof

Prove your content is real with Gmail-verified signatures

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Prove your content is real in the AI era. Create cryptographic signatures for any file using just your Gmail account. No expensive certificates needed - get tamper-proof Ed25519 signatures + QR codes for instant verification. Perfect for fighting deepfakes.
Content Proof gallery image
Content Proof gallery image
Content Proof gallery image
Free
Launch tags:Crypto•GitHub•Web3
Launch Team
Flowstep
Flowstep
Generate real UI in seconds
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What do you think? …

Sean O'Reilly
Maker
📌
"Hey Product Hunt! 👋 I built Content Proof because I was frustrated by how expensive and complex it is to prove digital content is authentic. Traditional signing certificates cost $250+ annually and require business verification. The "aha" moment: Everyone trusts Gmail accounts already. What if we could turn your Gmail identity into a signing certificate? What makes this different: Uses your existing Gmail trust (no new accounts/certificates) Ed25519 signatures survive metadata stripping (looking at you, Instagram) QR codes make verification mobile-friendly Free for individual creators Built with modern crypto: Same Ed25519 algorithm used by Signal, Tor, and SSH. SHA-256 hashing detects even single-bit changes. Perfect timing: With AI-generated content everywhere, human creators need a way to prove their work is genuine. Would love your feedback! What would make this more useful for your content verification needs?"