Signature proofs are a form of wallet ownership proof in which the user uses their private keys to sign an off-chain message which can then be verified using their blockchain address. This cryptographically proves that the user holds the private keys of the wallet where they intend to transfer funds.
The blockchains and wallets currently supported, along with more detailed technical information, are available in our Documentation.
If you have any questions or concerns, feel free to reach out to us at support@notabene.id or contact your Customer Success Manager.