Prove a document existed at a point in time — unaltered, forever, even against quantum computers.
Your file is hashed in your browser and never uploaded. We sign the hash with post-quantum ML-DSA-65 (NIST FIPS-204), timestamp it, and anchor it on-chain. You get a certificate anyone can verify — for good.
or click to choose — any file, any size
🔒 The file never leaves your device — only its SHA-256 hash is sentEnter a certificate ID or a document hash. We re-verify the post-quantum signature live, and prove that any altered document is rejected.
hashed locally — never uploaded
Your browser computes the SHA-256 of your file. The file itself never leaves your device.
The sovereign authority signs hash + timestamp with post-quantum ML-DSA-65 (NIST FIPS-204).
The proof is anchored on MameyNode (chain 20022) with a block height and transaction digest.
Anyone can re-verify the certificate. Change one byte of the document and the signature rejects it.
Timestamps signed with RSA/ECDSA can be forged once a large quantum computer runs Shor's algorithm. Old “proofs” stop being proofs.
ML-DSA-65 (CRYSTALS-Dilithium) rests on Module-LWE lattice hardness — no known quantum break. Your proof stays valid into the quantum era.
Runs on our own node, open-source crypto, zero third parties. The file is never seen — privacy by design.