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diff --git a/src/wallet/external_signer.h b/src/wallet/external_signer.h
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+++ b/src/wallet/external_signer.h
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+// Copyright (c) 2018-2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_WALLET_EXTERNAL_SIGNER_H
+#define BITCOIN_WALLET_EXTERNAL_SIGNER_H
+
+#include <stdexcept>
+#include <string>
+#include <univalue.h>
+
+class ExternalSignerException : public std::runtime_error {
+public:
+    using std::runtime_error::runtime_error;
+};
+
+//! Enables interaction with an external signing device or service, such as
+//! a hardware wallet. See doc/external-signer.md
+class ExternalSigner
+{
+private:
+    //! The command which handles interaction with the external signer.
+    std::string m_command;
+
+public:
+    //! @param[in] command      the command which handles interaction with the external signer
+    //! @param[in] fingerprint  master key fingerprint of the signer
+    ExternalSigner(const std::string& command, const std::string& fingerprint);
+
+    //! Master key fingerprint of the signer
+    std::string m_fingerprint;
+};
+
+#endif // BITCOIN_WALLET_EXTERNAL_SIGNER_H