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Your file never leaves your device. Only a fingerprint is used—not the document itself. Create an agreement, invite others, and sign. Print when everyone is done. All of that is free. When you want lasting proof, lock the fingerprint on the blockchain for one credit. Anyone can check later that the file has not changed—even without an account. They just need the original document. You can also store signatures and filled fields on-chain, so the proof trail outlives any single server. Private by default. Public proof when you need it.