diff --git a/src/blockfilter.cpp b/src/blockfilter.cpp
index 1a65e910c84f..496ec24fd2a5 100644
--- a/src/blockfilter.cpp
+++ b/src/blockfilter.cpp
@@ -28,7 +28,7 @@ static const std::map<BlockFilterType, std::string> g_filter_types = {
 uint64_t GCSFilter::HashToRange(const Element& element) const
 {
     uint64_t hash = CSipHasher(m_params.m_siphash_k0, m_params.m_siphash_k1)
-        .Write(element.data(), element.size())
+        .Write(element)
         .Finalize();
     return FastRange64(hash, m_F);
 }
diff --git a/src/core_io.h b/src/core_io.h
index bb05111da5da..1bf88ae23b79 100644
--- a/src/core_io.h
+++ b/src/core_io.h
@@ -16,6 +16,7 @@ class CBlock;
 class CBlockHeader;
 class CScript;
 class CTransaction;
+class SigningProvider;
 class CTxUndo;
 class uint256;
 struct CMutableTransaction;
@@ -55,7 +56,7 @@ UniValue ValueFromAmount(const CAmount amount);
 std::string FormatScript(const CScript& script);
 std::string EncodeHexTx(const CTransaction& tx);
 std::string SighashToStr(unsigned char sighash_type);
-void ScriptToUniv(const CScript& script, UniValue& out, bool include_hex = true, bool include_address = false);
+void ScriptToUniv(const CScript& script, UniValue& out, bool include_hex = true, bool include_address = false, const SigningProvider* provider = nullptr);
 void TxToUniv(const CTransaction& tx, const uint256& block_hash, UniValue& entry, bool include_hex = true, int serialize_flags = 0, const CTxUndo* txundo = nullptr, TxVerbosity verbosity = TxVerbosity::SHOW_DETAILS, const CSpentIndexTxInfo* ptxSpentInfo = nullptr);
 
 // evo/core_write.cpp
diff --git a/src/core_write.cpp b/src/core_write.cpp
index a3ec9b5643cb..8303cad671c3 100644
--- a/src/core_write.cpp
+++ b/src/core_write.cpp
@@ -156,13 +156,13 @@ std::string EncodeHexTx(const CTransaction& tx)
     return HexStr(ssTx);
 }
 
-void ScriptToUniv(const CScript& script, UniValue& out, bool include_hex, bool include_address)
+void ScriptToUniv(const CScript& script, UniValue& out, bool include_hex, bool include_address, const SigningProvider* provider)
 {
     CTxDestination address;
 
     out.pushKV("asm", ScriptToAsmStr(script));
     if (include_address) {
-        out.pushKV("desc", InferDescriptor(script, DUMMY_SIGNING_PROVIDER)->ToString());
+        out.pushKV("desc", InferDescriptor(script, provider ? *provider : DUMMY_SIGNING_PROVIDER)->ToString());
     }
     if (include_hex) {
         out.pushKV("hex", HexStr(script));
diff --git a/src/crypto/siphash.cpp b/src/crypto/siphash.cpp
index 679ae566696d..8004a0548ecb 100644
--- a/src/crypto/siphash.cpp
+++ b/src/crypto/siphash.cpp
@@ -45,14 +45,14 @@ CSipHasher& CSipHasher::Write(uint64_t data)
     return *this;
 }
 
-CSipHasher& CSipHasher::Write(const unsigned char* data, size_t size)
+CSipHasher& CSipHasher::Write(Span<const unsigned char> data)
 {
     uint64_t v0 = v[0], v1 = v[1], v2 = v[2], v3 = v[3];
     uint64_t t = tmp;
     uint8_t c = count;
 
-    while (size--) {
-        t |= ((uint64_t)(*(data++))) << (8 * (c % 8));
+    while (data.size() > 0) {
+        t |= uint64_t{data.front()} << (8 * (c % 8));
         c++;
         if ((c & 7) == 0) {
             v3 ^= t;
@@ -61,6 +61,7 @@ CSipHasher& CSipHasher::Write(const unsigned char* data, size_t size)
             v0 ^= t;
             t = 0;
         }
+        data = data.subspan(1);
     }
 
     v[0] = v0;
diff --git a/src/crypto/siphash.h b/src/crypto/siphash.h
index b573526932d5..4fb3dc2f2584 100644
--- a/src/crypto/siphash.h
+++ b/src/crypto/siphash.h
@@ -7,6 +7,7 @@
 
 #include <stdint.h>
 
+#include <span.h>
 #include <uint256.h>
 
 /** SipHash-2-4 */
@@ -26,7 +27,7 @@ class CSipHasher
      */
     CSipHasher& Write(uint64_t data);
     /** Hash arbitrary bytes. */
-    CSipHasher& Write(const unsigned char* data, size_t size);
+    CSipHasher& Write(Span<const unsigned char> data);
     /** Compute the 64-bit SipHash-2-4 of the data written so far. The object remains untouched. */
     uint64_t Finalize() const;
 };
diff --git a/src/llmq/quorums.h b/src/llmq/quorums.h
index 2b28f80835ec..80cf0e839d5d 100644
--- a/src/llmq/quorums.h
+++ b/src/llmq/quorums.h
@@ -235,10 +235,10 @@ struct SaltedHasherImpl<llmq::CQuorumDataRequestKey>
     static std::size_t CalcHash(const llmq::CQuorumDataRequestKey& v, uint64_t k0, uint64_t k1)
     {
         CSipHasher c(k0, k1);
-        c.Write(reinterpret_cast<const unsigned char*>(&v.proRegTx), sizeof(v.proRegTx));
-        c.Write(reinterpret_cast<const unsigned char*>(&v.m_we_requested), sizeof(v.m_we_requested));
-        c.Write(reinterpret_cast<const unsigned char*>(&v.quorumHash), sizeof(v.quorumHash));
-        c.Write(reinterpret_cast<const unsigned char*>(&v.llmqType), sizeof(v.llmqType));
+        c.Write(Span{reinterpret_cast<const unsigned char*>(&v.proRegTx), sizeof(v.proRegTx)});
+        c.Write(Span{reinterpret_cast<const unsigned char*>(&v.m_we_requested), sizeof(v.m_we_requested)});
+        c.Write(Span{reinterpret_cast<const unsigned char*>(&v.quorumHash), sizeof(v.quorumHash)});
+        c.Write(Span{reinterpret_cast<const unsigned char*>(&v.llmqType), sizeof(v.llmqType)});
         return c.Finalize();
     }
 };
diff --git a/src/net.cpp b/src/net.cpp
index 4e9d3457cb7f..a2828e314b97 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -4267,7 +4267,7 @@ std::vector<CAddress> CConnman::GetAddresses(CNode& requestor, size_t max_addres
     auto local_socket_bytes = requestor.addrBind.GetAddrBytes();
     uint64_t cache_id = GetDeterministicRandomizer(RANDOMIZER_ID_ADDRCACHE)
         .Write(requestor.ConnectedThroughNetwork())
-        .Write(local_socket_bytes.data(), local_socket_bytes.size())
+        .Write(local_socket_bytes)
         // For outbound connections, the port of the bound address is randomly
         // assigned by the OS and would therefore not be useful for seeding.
         .Write(requestor.IsInboundConn() ? requestor.addrBind.GetPort() : 0)
@@ -4974,7 +4974,7 @@ uint64_t CConnman::CalculateKeyedNetGroup(const CAddress& address) const
 {
     std::vector<unsigned char> vchNetGroup(m_netgroupman.GetGroup(address));
 
-    return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(vchNetGroup.data(), vchNetGroup.size()).Finalize();
+    return GetDeterministicRandomizer(RANDOMIZER_ID_NETGROUP).Write(vchNetGroup).Finalize();
 }
 
 void CConnman::PerformReconnections()
diff --git a/src/netaddress.h b/src/netaddress.h
index 173179309add..f7ab7bfce9e0 100644
--- a/src/netaddress.h
+++ b/src/netaddress.h
@@ -586,7 +586,7 @@ class CServiceHash
         CSipHasher hasher(m_salt_k0, m_salt_k1);
         hasher.Write(a.m_net);
         hasher.Write(a.port);
-        hasher.Write(a.m_addr.data(), a.m_addr.size());
+        hasher.Write(a.m_addr);
         return static_cast<size_t>(hasher.Finalize());
     }
 
diff --git a/src/test/fuzz/addrman.cpp b/src/test/fuzz/addrman.cpp
index eddd958094bb..33206cdfffcf 100644
--- a/src/test/fuzz/addrman.cpp
+++ b/src/test/fuzz/addrman.cpp
@@ -170,8 +170,8 @@ class AddrManDeterministic : public AddrMan
             hasher.Write(a.source.GetNetwork());
             hasher.Write(addr_key.size());
             hasher.Write(source_key.size());
-            hasher.Write(addr_key.data(), addr_key.size());
-            hasher.Write(source_key.data(), source_key.size());
+            hasher.Write(addr_key);
+            hasher.Write(source_key);
             return (size_t)hasher.Finalize();
         };
 
diff --git a/src/test/fuzz/crypto.cpp b/src/test/fuzz/crypto.cpp
index 2fd8327b36f0..5c7d9d94433a 100644
--- a/src/test/fuzz/crypto.cpp
+++ b/src/test/fuzz/crypto.cpp
@@ -57,7 +57,7 @@ FUZZ_TARGET(crypto)
                 (void)sha256.Write(data.data(), data.size());
                 (void)sha3.Write(data);
                 (void)sha512.Write(data.data(), data.size());
-                (void)sip_hasher.Write(data.data(), data.size());
+                (void)sip_hasher.Write(data);
 
                 (void)Hash(data);
                 (void)Hash160(data);
diff --git a/src/test/fuzz/golomb_rice.cpp b/src/test/fuzz/golomb_rice.cpp
index 1a1225b635d3..e006653ca94c 100644
--- a/src/test/fuzz/golomb_rice.cpp
+++ b/src/test/fuzz/golomb_rice.cpp
@@ -23,7 +23,7 @@ namespace {
 uint64_t HashToRange(const std::vector<uint8_t>& element, const uint64_t f)
 {
     const uint64_t hash = CSipHasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL)
-                              .Write(element.data(), element.size())
+                              .Write(element)
                               .Finalize();
     return FastRange64(hash, f);
 }
diff --git a/src/test/hash_tests.cpp b/src/test/hash_tests.cpp
index fd18212185ab..157451cc611e 100644
--- a/src/test/hash_tests.cpp
+++ b/src/test/hash_tests.cpp
@@ -83,21 +83,21 @@ BOOST_AUTO_TEST_CASE(siphash)
     CSipHasher hasher(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x726fdb47dd0e0e31ull);
     static const unsigned char t0[1] = {0};
-    hasher.Write(t0, 1);
+    hasher.Write(t0);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x74f839c593dc67fdull);
     static const unsigned char t1[7] = {1,2,3,4,5,6,7};
-    hasher.Write(t1, 7);
+    hasher.Write(t1);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x93f5f5799a932462ull);
     hasher.Write(0x0F0E0D0C0B0A0908ULL);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x3f2acc7f57c29bdbull);
     static const unsigned char t2[2] = {16,17};
-    hasher.Write(t2, 2);
+    hasher.Write(t2);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x4bc1b3f0968dd39cull);
     static const unsigned char t3[9] = {18,19,20,21,22,23,24,25,26};
-    hasher.Write(t3, 9);
+    hasher.Write(t3);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x2f2e6163076bcfadull);
     static const unsigned char t4[5] = {27,28,29,30,31};
-    hasher.Write(t4, 5);
+    hasher.Write(t4);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x7127512f72f27cceull);
     hasher.Write(0x2726252423222120ULL);
     BOOST_CHECK_EQUAL(hasher.Finalize(),  0x0e3ea96b5304a7d0ull);
@@ -111,7 +111,7 @@ BOOST_AUTO_TEST_CASE(siphash)
     for (uint8_t x=0; x<std::size(siphash_4_2_testvec); ++x)
     {
         BOOST_CHECK_EQUAL(hasher2.Finalize(), siphash_4_2_testvec[x]);
-        hasher2.Write(&x, 1);
+        hasher2.Write(Span{&x, 1});
     }
     // Check test vectors from spec, eight bytes at a time
     CSipHasher hasher3(0x0706050403020100ULL, 0x0F0E0D0C0B0A0908ULL);
@@ -139,9 +139,9 @@ BOOST_AUTO_TEST_CASE(siphash)
         uint8_t nb[4];
         WriteLE32(nb, n);
         CSipHasher sip256(k1, k2);
-        sip256.Write(x.begin(), 32);
+        sip256.Write(x);
         CSipHasher sip288 = sip256;
-        sip288.Write(nb, 4);
+        sip288.Write(nb);
         BOOST_CHECK_EQUAL(SipHashUint256(k1, k2, x), sip256.Finalize());
         BOOST_CHECK_EQUAL(SipHashUint256Extra(k1, k2, x, n), sip288.Finalize());
     }
diff --git a/src/txrequest.cpp b/src/txrequest.cpp
index b748ccaf1262..ae1beed5c634 100644
--- a/src/txrequest.cpp
+++ b/src/txrequest.cpp
@@ -116,7 +116,7 @@ class PriorityComputer {
 
     Priority operator()(const CInv& inv, NodeId peer, bool preferred) const
     {
-        uint64_t low_bits = CSipHasher(m_k0, m_k1).Write(inv.hash.begin(), inv.hash.size()).Write(inv.type).Write(peer).Finalize() >> 1;
+        uint64_t low_bits = CSipHasher(m_k0, m_k1).Write(inv.hash).Write(inv.type).Write(peer).Finalize() >> 1;
         return low_bits | uint64_t{preferred} << 63;
     }
 
diff --git a/src/util/bytevectorhash.cpp b/src/util/bytevectorhash.cpp
index 29be138eeb1f..92f1dbd5d80e 100644
--- a/src/util/bytevectorhash.cpp
+++ b/src/util/bytevectorhash.cpp
@@ -16,5 +16,5 @@ ByteVectorHash::ByteVectorHash() :
 
 size_t ByteVectorHash::operator()(const std::vector<unsigned char>& input) const
 {
-    return CSipHasher(m_k0, m_k1).Write(input.data(), input.size()).Finalize();
+    return CSipHasher(m_k0, m_k1).Write(input).Finalize();
 }
diff --git a/src/util/hasher.cpp b/src/util/hasher.cpp
index bc1f84479bc7..4ce0df4fcb62 100644
--- a/src/util/hasher.cpp
+++ b/src/util/hasher.cpp
@@ -20,5 +20,5 @@ SaltedSipHasher::SaltedSipHasher() : m_k0(GetRand<uint64_t>()), m_k1(GetRand<uin
 
 size_t SaltedSipHasher::operator()(const Span<const unsigned char>& script) const
 {
-    return CSipHasher(m_k0, m_k1).Write(script.data(), script.size()).Finalize();
+    return CSipHasher(m_k0, m_k1).Write(script).Finalize();
 }
diff --git a/test/functional/mempool_packages.py b/test/functional/mempool_packages.py
index cb2207999f8e..029be2cdeff6 100755
--- a/test/functional/mempool_packages.py
+++ b/test/functional/mempool_packages.py
@@ -7,7 +7,6 @@
 from decimal import Decimal
 
 from test_framework.messages import (
-    COIN,
     DEFAULT_ANCESTOR_LIMIT,
     DEFAULT_DESCENDANT_LIMIT,
 )
@@ -26,9 +25,6 @@
 
 
 class MempoolPackagesTest(BitcoinTestFramework):
-    def add_options(self, parser):
-        self.add_wallet_options(parser)
-
     def set_test_params(self):
         self.num_nodes = 2
         self.extra_args = [
@@ -47,10 +43,6 @@ def run_test(self):
         self.wallet = MiniWallet(self.nodes[0])
         self.wallet.rescan_utxos()
 
-        if self.is_specified_wallet_compiled():
-            self.nodes[0].createwallet("watch_wallet", disable_private_keys=True)
-            self.nodes[0].importaddress(self.wallet.get_address())
-
         peer_inv_store = self.nodes[0].add_p2p_connection(P2PTxInvStore()) # keep track of invs
 
         # DEFAULT_ANCESTOR_LIMIT transactions off a confirmed tx should be fine
@@ -63,13 +55,6 @@ def run_test(self):
             ancestor_vsize += t["tx"].get_vsize()
             ancestor_fees += t["fee"]
             self.wallet.sendrawtransaction(from_node=self.nodes[0], tx_hex=t["hex"])
-            # Check that listunspent ancestor{count, size, fees} yield the correct results
-            if self.is_specified_wallet_compiled():
-                wallet_unspent = self.nodes[0].listunspent(minconf=0)
-                this_unspent = next(utxo_info for utxo_info in wallet_unspent if utxo_info["txid"] == t["txid"])
-                assert_equal(this_unspent['ancestorcount'], i + 1)
-                assert_equal(this_unspent['ancestorsize'], ancestor_vsize)
-                assert_equal(this_unspent['ancestorfees'], ancestor_fees * COIN)
 
         # Wait until mempool transactions have passed initial broadcast (sent inv and received getdata)
         # Otherwise, getrawmempool may be inconsistent with getmempoolentry if unbroadcast changes in between
diff --git a/test/functional/wallet_basic.py b/test/functional/wallet_basic.py
index 62e9c26f6de0..9f3147bcf2e6 100755
--- a/test/functional/wallet_basic.py
+++ b/test/functional/wallet_basic.py
@@ -8,6 +8,10 @@
 
 from test_framework.blocktools import COINBASE_MATURITY
 from test_framework.descriptors import descsum_create
+from test_framework.messages import (
+    COIN,
+    DEFAULT_ANCESTOR_LIMIT,
+)
 from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
     assert_array_result,
@@ -19,6 +23,7 @@
     find_vout_for_address,
 )
 from test_framework.wallet_util import test_address
+from test_framework.wallet import MiniWallet
 
 NOT_A_NUMBER_OR_STRING = "Amount is not a number or string"
 OUT_OF_RANGE = "Amount out of range"
@@ -828,6 +833,34 @@ def run_test(self):
 
         zeroconf_wallet.sendtoaddress(zeroconf_wallet.getnewaddress(), Decimal('0.5'))
 
+        self.test_chain_listunspent()
+
+    def test_chain_listunspent(self):
+        if not self.options.descriptors:
+            return
+        self.wallet = MiniWallet(self.nodes[0])
+        self.nodes[0].get_wallet_rpc(self.default_wallet_name).sendtoaddress(self.wallet.get_address(), "5")
+        self.generate(self.wallet, 1, sync_fun=self.no_op)
+        self.nodes[0].createwallet("watch_wallet", disable_private_keys=True)
+        watch_wallet = self.nodes[0].get_wallet_rpc("watch_wallet")
+        watch_wallet.importaddress(self.wallet.get_address())
+
+        # DEFAULT_ANCESTOR_LIMIT transactions off a confirmed tx should be fine
+        chain = self.wallet.create_self_transfer_chain(chain_length=DEFAULT_ANCESTOR_LIMIT)
+        ancestor_vsize = 0
+        ancestor_fees = Decimal(0)
+
+        for i, t in enumerate(chain):
+            ancestor_vsize += t["tx"].get_vsize()
+            ancestor_fees += t["fee"]
+            self.wallet.sendrawtransaction(from_node=self.nodes[0], tx_hex=t["hex"])
+            # Check that listunspent ancestor{count, size, fees} yield the correct results
+            wallet_unspent = watch_wallet.listunspent(minconf=0)
+            this_unspent = next(utxo_info for utxo_info in wallet_unspent if utxo_info["txid"] == t["txid"])
+            assert_equal(this_unspent['ancestorcount'], i + 1)
+            assert_equal(this_unspent['ancestorsize'], ancestor_vsize)
+            assert_equal(this_unspent['ancestorfees'], ancestor_fees * COIN)
+
 
 if __name__ == '__main__':
     WalletTest().main()