diff --git a/include/bitcoin/node/chase.hpp b/include/bitcoin/node/chase.hpp
index 557e3143..ed2e18b6 100644
--- a/include/bitcoin/node/chase.hpp
+++ b/include/bitcoin/node/chase.hpp
@@ -145,6 +145,17 @@ enum class chase
     /// Issued by 'confirm' [and handled by 'transaction'].
     reorganized,
 
+    /// Wallet.
+    /// -----------------------------------------------------------------------
+
+    /// An input spent|unspent the given address (address_t).
+    /// Issued by 'confirm' [and handled by services].
+    spent,
+
+    /// An address of given address received|unreceived payment (address_t).
+    /// Issued by 'confirm' [and handled by services].
+    received,
+
     /// Mining.
     /// -----------------------------------------------------------------------
 
diff --git a/include/bitcoin/node/define.hpp b/include/bitcoin/node/define.hpp
index ac433205..3113d8d8 100644
--- a/include/bitcoin/node/define.hpp
+++ b/include/bitcoin/node/define.hpp
@@ -73,6 +73,7 @@ using peer_t = uint64_t;
 using object_t = object_key;
 using header_t = database::header_link::integer;
 using transaction_t = database::tx_link::integer;
+using address_t = database::address_link::integer;
 
 /// std::variant types must be distinct, and xcode size_t is neither uint32_t 
 /// nor uint64_t, so this ensures we have the distinct set of necessary types.