Every other e-signature tool is a walled garden — if the vendor disappears, the proof goes with it. ProofLeaf is built the opposite way. ESIGN/UETA-compliant signing, plus a signed document that anyone can independently verify — forever, with no ProofLeaf account and no ProofLeaf servers.
Every completed document ships with an embedded audit trail, a SHA-256 fingerprint, and a Forever Verification Bundle — plus an open-source, MIT-licensed verifier anyone can run offline. No ProofLeaf required, ever.
Each signer is shown and attests to the document's exact fingerprint before signing. The original-to-final hash chain is recorded in the audit trail and Certificate of Evidence — not just that they signed, but exactly what.
Each document's hash is anchored to the Bitcoin blockchain via OpenTimestamps and is checkable against public block explorers by anyone. A decentralized proof-of-existence — not an RFC-3161 or qualified timestamp.
Timestamp any file to prove it existed, publish a public commitment to a statement or file, or verify a signed document. Files are hashed in your browser and never uploaded.
Honest note: ProofLeaf's default signing certificate is self-signed — it proves a document is unaltered; trusting who the signing authority is still means trusting ProofLeaf, exactly as disclosed. The hash, Bitcoin anchor, and open verifier do not.