Style, comments.

Author: evoskuil

include/bitcoin/system/chain/input.hpp

@@ -160,7 +160,6 @@ class BC_API input
     sizes size_;
 
 public:
-    /// TODO: prevout destruct requires input destruct.
     /// Public mutable metadata access, copied but not compared for equality.
     /// Defaults are set so non-population issues usually imply invalidity.
     mutable chain::output::cptr prevout{};

include/bitcoin/system/chain/prevout.hpp

@@ -37,10 +37,10 @@ class BC_API prevout final
     {
         /// The confirmed chain height of the prevout (zero if not found).
         /// Unused if the input owning this prevout is null (coinbase).
-        size_t height{ zero };
+        size_t height;
 
-        /// node: populated with database identifier for prevout's parent tx.
-        uint32_t parent;
+        /// node: populated with a database identifier for the parent tx.
+        uint32_t parent{ zero };
     };
 
     ///************************************************************************
@@ -53,8 +53,8 @@ class BC_API prevout final
         /// Unused if the input owning this prevout is null (coinbase).
         uint32_t median_time_past{ max_uint32 };
 
-        /// node: populated with database identifier for spender's parent tx.
-        uint32_t spender;
+        /// node: set to the database record of the input association.
+        uint32_t link;
     };
 
     ///************************************************************************