Offline signature verifier

This self-contained file verifies signatures offline. Paste a signature link or its ending below. Verification updates as you type.

Signature link or ending

Nothing verified. Paste a link or ending above.

How it works

Noah's private key signs the message and its issue time. Ed25519 signatures let anyone holding the public key confirm their origin and detect changes. The signed time is the signer's statement, not an independent time guarantee.

The compact link contains the data and signature, not a server database lookup. Signatures are not encryption: anyone with the complete link can read the message.

This file does not need a network connection and never uploads messages.

This file trusts its embedded public key. Offline copies cannot learn about a key replacement or compromise.