OpenSig

OpenSig is a simple yet powerful standalone e-signature dapp for digitally signing documents and files on EVM-based blockchains.

Privacy is paramount.  Documents are never uploaded and signatures published to the blockchain cannot be identified or decrypted without the original document.  Even top secret documents can be signed with confidence from the privacy of your computer without having to trust a third party.

OpenSig’s annotation feature can be used to annotate signatures with a purpose, message, url or other data.  Annotations are encrypted by default so that only users with the original document can read them.  If unencrypted they can be used to write public messages to the blockchain.

OpenSig does not charge for publishing signatures, you only pay the blockchain transaction fee.

Features

• Provides proof of existence.
• Provides proof of possession.
• Signatures are non-repudiable.
• Annotate signatures with an encrypted purpose, message, url or other data.
• Notarise public data to the blockchain.

Uses

• Digitally signing documents and contracts.
• Protecting your creations from future copyright challenges.
• Notarising public messages to the blockchain.
• Publishing public links to files on decentralised storage.