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diff --git a/src/wallet/types.h b/src/wallet/types.h
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+// Copyright (c) 2009-2010 Satoshi Nakamoto
+// Copyright (c) 2009-2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+//! @file Public type definitions that are used inside and outside of the wallet
+//! (e.g. by src/wallet and src/interfaces and src/qt code).
+//!
+//! File is home for simple enum and struct definitions that don't deserve
+//! separate header files. More complicated wallet public types like
+//! CCoinControl that are used externally can have separate headers.
+
+#ifndef BITCOIN_WALLET_TYPES_H
+#define BITCOIN_WALLET_TYPES_H
+
+#include <type_traits>
+
+namespace wallet {
+/**
+ * IsMine() return codes, which depend on ScriptPubKeyMan implementation.
+ * Not every ScriptPubKeyMan covers all types, please refer to
+ * https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-0.21.0.md#ismine-semantics
+ * for better understanding.
+ *
+ * For LegacyScriptPubKeyMan,
+ * ISMINE_NO: the scriptPubKey is not in the wallet;
+ * ISMINE_WATCH_ONLY: the scriptPubKey has been imported into the wallet;
+ * ISMINE_SPENDABLE: the scriptPubKey corresponds to an address owned by the wallet user (can spend with the private key);
+ * ISMINE_USED: the scriptPubKey corresponds to a used address owned by the wallet user;
+ * ISMINE_ALL: all ISMINE flags except for USED;
+ * ISMINE_ALL_USED: all ISMINE flags including USED;
+ * ISMINE_ENUM_ELEMENTS: the number of isminetype enum elements.
+ *
+ * For DescriptorScriptPubKeyMan and future ScriptPubKeyMan,
+ * ISMINE_NO: the scriptPubKey is not in the wallet;
+ * ISMINE_SPENDABLE: the scriptPubKey matches a scriptPubKey in the wallet.
+ * ISMINE_USED: the scriptPubKey corresponds to a used address owned by the wallet user.
+ *
+ */
+enum isminetype : unsigned int {
+    ISMINE_NO         = 0,
+    ISMINE_WATCH_ONLY = 1 << 0,
+    ISMINE_SPENDABLE  = 1 << 1,
+    ISMINE_USED       = 1 << 2,
+    ISMINE_ALL        = ISMINE_WATCH_ONLY | ISMINE_SPENDABLE,
+    ISMINE_ALL_USED   = ISMINE_ALL | ISMINE_USED,
+    ISMINE_ENUM_ELEMENTS,
+};
+/** used for bitflags of isminetype */
+using isminefilter = std::underlying_type<isminetype>::type;
+} // namespace wallet
+
+#endif // BITCOIN_WALLET_TYPES_H