refactor: Convert remaining instances from uint256 to Txid

These remaining miscellaneous changes were identified by commenting out
the `operator const uint256&` conversion and the `Compare(const uint256&)`
method from `transaction_identifier.h`.

src/util/hasher.cpp

@@ -7,10 +7,18 @@
 #include <span.h>
 #include <util/hasher.h>
 
+SaltedUint256Hasher::SaltedUint256Hasher() :
+    k0{FastRandomContext().rand64()},
+    k1{FastRandomContext().rand64()} {}
+
 SaltedTxidHasher::SaltedTxidHasher() :
     k0{FastRandomContext().rand64()},
     k1{FastRandomContext().rand64()} {}
 
+SaltedWtxidHasher::SaltedWtxidHasher() :
+    k0{FastRandomContext().rand64()},
+    k1{FastRandomContext().rand64()} {}
+
 SaltedOutpointHasher::SaltedOutpointHasher(bool deterministic) :
     k0{deterministic ? 0x8e819f2607a18de6 : FastRandomContext().rand64()},
     k1{deterministic ? 0xf4020d2e3983b0eb : FastRandomContext().rand64()}

src/util/hasher.h

@@ -11,9 +11,24 @@
 #include <span.h>
 #include <uint256.h>
 
+#include <concepts>
 #include <cstdint>
 #include <cstring>
 
+class SaltedUint256Hasher
+{
+private:
+    /** Salt */
+    const uint64_t k0, k1;
+
+public:
+    SaltedUint256Hasher();
+
+    size_t operator()(const uint256& hash) const {
+        return SipHashUint256(k0, k1, hash);
+    }
+};
+
 class SaltedTxidHasher
 {
 private:
@@ -23,11 +38,26 @@ private:
 public:
     SaltedTxidHasher();
 
-    size_t operator()(const uint256& txid) const {
-        return SipHashUint256(k0, k1, txid);
+    size_t operator()(const Txid& txid) const {
+        return SipHashUint256(k0, k1, txid.ToUint256());
     }
 };
 
+class SaltedWtxidHasher
+{
+private:
+    /** Salt */
+    const uint64_t k0, k1;
+
+public:
+    SaltedWtxidHasher();
+
+    size_t operator()(const Wtxid& wtxid) const {
+        return SipHashUint256(k0, k1, wtxid.ToUint256());
+    }
+};
+
+
 class SaltedOutpointHasher
 {
 private:
@@ -47,7 +77,7 @@ public:
      * @see https://gcc.gnu.org/onlinedocs/gcc-13.2.0/libstdc++/manual/manual/unordered_associative.html
      */
     size_t operator()(const COutPoint& id) const noexcept {
-        return SipHashUint256Extra(k0, k1, id.hash, id.n);
+        return SipHashUint256Extra(k0, k1, id.hash.ToUint256(), id.n);
     }
 };