. #25085

Concept ACK

<details><summary>A few suggestions regarding filter_checked</summary><p>

diff --git a/src/blockfilter.cpp b/src/blockfilter.cpp
index 59f34bc54e..0ab89fdbdb 100644
--- a/src/blockfilter.cpp
+++ b/src/blockfilter.cpp
@@ -47,7 +47,7 @@ GCSFilter::GCSFilter(const Params& params)
     : m_params(params), m_N(0), m_F(0), m_encoded{0}
 {}
 
-GCSFilter::GCSFilter(const Params& params, std::vector<unsigned char> encoded_filter, const bool filter_checked)
+GCSFilter::GCSFilter(const Params& params, std::vector<unsigned char> encoded_filter, bool filter_checked)
     : m_params(params), m_encoded(std::move(encoded_filter))
 {
     SpanReader stream{GCS_SER_TYPE, GCS_SER_VERSION, m_encoded};
@@ -221,7 +221,7 @@ static GCSFilter::ElementSet BasicFilterElements(const CBlock& block,
 }
 
 BlockFilter::BlockFilter(BlockFilterType filter_type, const uint256& block_hash,
-                         std::vector<unsigned char> filter, const bool filter_checked)
+                         std::vector<unsigned char> filter, bool filter_checked)
     : m_filter_type(filter_type), m_block_hash(block_hash)
 {
     GCSFilter::Params params;
diff --git a/src/blockfilter.h b/src/blockfilter.h
index af054dbf34..5de5679834 100644
--- a/src/blockfilter.h
+++ b/src/blockfilter.h
@@ -59,7 +59,7 @@ public:
     explicit GCSFilter(const Params& params = Params());
 
     /** Reconstructs an already-created filter from an encoding. */
-    GCSFilter(const Params& params, std::vector<unsigned char> encoded_filter, const bool filter_checked=false);
+    GCSFilter(const Params& params, std::vector<unsigned char> encoded_filter, bool filter_checked = false);
 
     /** Builds a new filter from the params and set of elements. */
     GCSFilter(const Params& params, const ElementSet& elements);
@@ -122,7 +122,7 @@ public:
 
     //! Reconstruct a BlockFilter from parts.
     BlockFilter(BlockFilterType filter_type, const uint256& block_hash,
-                std::vector<unsigned char> filter, const bool filter_checked=false);
+                std::vector<unsigned char> filter, bool filter_checked = false);
 
     //! Construct a new BlockFilter of the specified type from a block.
     BlockFilter(BlockFilterType filter_type, const CBlock& block, const CBlockUndo& block_undo);
diff --git a/src/index/blockfilterindex.cpp b/src/index/blockfilterindex.cpp
index bad766ebe1..0a4728f571 100644
--- a/src/index/blockfilterindex.cpp
+++ b/src/index/blockfilterindex.cpp
@@ -159,7 +159,7 @@ bool BlockFilterIndex::ReadFilterFromDisk(const FlatFilePos& pos, BlockFilter& f
         uint256 result;
         CHash256().Write(encoded_filter).Finalize(result);
         if (result != hash) return error("Checksum mismatch in filter decode.");
-        filter = BlockFilter(GetFilterType(), block_hash, std::move(encoded_filter), true);
+        filter = BlockFilter(GetFilterType(), block_hash, std::move(encoded_filter), /*filter_checked=*/true);
     }

</p></details>

Originally posted by @jonatack in #24832#pullrequestreview-939386764