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.
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The blockchains and wallets currently supported, along with more detailed technical information, are available in our Documentation.
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If you have any questions or concerns, feel free to reach out to us at support@notabene.id or contact your Customer Success Manager.