diff --git a/include/bitcoin/database/impl/query/confirm.ipp b/include/bitcoin/database/impl/query/confirm.ipp
index 89a13848..598dfc53 100644
--- a/include/bitcoin/database/impl/query/confirm.ipp
+++ b/include/bitcoin/database/impl/query/confirm.ipp
@@ -130,7 +130,7 @@ bool CLASS::is_spent(const spend_link& link) const NOEXCEPT
 
 // unused
 TEMPLATE
-bool CLASS::is_strong(const spend_link& link) const NOEXCEPT
+bool CLASS::is_strong_spend(const spend_link& link) const NOEXCEPT
 {
     return !to_block(to_spend_tx(link)).is_terminal();
 }
@@ -284,6 +284,7 @@ inline error::error_t CLASS::unspendable_prevout(const point_link& link,
     return error::success;
 }
 
+
 TEMPLATE
 inline error::error_t CLASS::unspent_duplicates(const tx_link& link,
     const context& ctx) const NOEXCEPT
@@ -291,6 +292,7 @@ inline error::error_t CLASS::unspent_duplicates(const tx_link& link,
     if (!ctx.is_enabled(system::chain::flags::bip30_rule))
         return error::success;
 
+    // This will be empty if current block is not set_strong.
     const auto coinbases = to_strongs(get_tx_key(link));
     if (coinbases.empty())
         return error::integrity;
@@ -319,7 +321,7 @@ code CLASS::block_confirmable(const header_link& link) const NOEXCEPT
     if (txs.empty())
         return error::success;
 
-    code ec{};
+    code ec{}; 
     if ((ec = unspent_duplicates(txs.front(), ctx)))
         return ec;
 
@@ -363,6 +365,12 @@ bool CLASS::set_strong(const header_link& link, const tx_links& txs,
     });
 }
 
+TEMPLATE
+bool CLASS::is_strong(const header_link& link) const NOEXCEPT
+{
+    return !to_block(to_coinbase(link)).is_terminal();
+}
+
 TEMPLATE
 bool CLASS::set_strong(const header_link& link) NOEXCEPT
 {
diff --git a/include/bitcoin/database/query.hpp b/include/bitcoin/database/query.hpp
index 18d98021..040ff264 100644
--- a/include/bitcoin/database/query.hpp
+++ b/include/bitcoin/database/query.hpp
@@ -416,7 +416,8 @@ class query
     /// These are not used in confirmation.
     /// These rely on strong (use only for confirmation process).
     bool is_spent(const spend_link& link) const NOEXCEPT;
-    bool is_strong(const spend_link& link) const NOEXCEPT;
+    bool is_strong(const header_link& link) const NOEXCEPT;
+    bool is_strong_spend(const spend_link& link) const NOEXCEPT;
     bool is_mature(const spend_link& link, size_t height) const NOEXCEPT;
     bool is_locked(const spend_link& link, uint32_t sequence,
         const context& ctx) const NOEXCEPT;
diff --git a/test/query/confirm.cpp b/test/query/confirm.cpp
index 5719755a..b32a2e07 100644
--- a/test/query/confirm.cpp
+++ b/test/query/confirm.cpp
@@ -238,6 +238,32 @@ BOOST_AUTO_TEST_CASE(query_confirm__is_spent_output__strong_confirmed__true)
     BOOST_REQUIRE(query.is_spent_output(query.to_output(1, 1)));  // block1a
 }
 
+BOOST_AUTO_TEST_CASE(query_confirm__is_strong_spend__strong__true)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE_EQUAL(store.create(events_handler), error::success);
+    BOOST_REQUIRE(query.initialize(test::genesis));
+    BOOST_REQUIRE(query.is_strong_spend(query.to_spend(0, 0)));
+}
+
+BOOST_AUTO_TEST_CASE(query_confirm__is_strong_spend__weak__false)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE_EQUAL(store.create(events_handler), error::success);
+    BOOST_REQUIRE(query.initialize(test::genesis));
+    BOOST_REQUIRE(query.set(test::block1, context{}));
+    BOOST_REQUIRE(!query.is_strong_spend(query.to_spend(1, 0)));
+    BOOST_REQUIRE(query.set_strong(1));
+    BOOST_REQUIRE(query.is_strong_spend(query.to_spend(1, 0)));
+}
+
+// The coinbase tx is strong.
 BOOST_AUTO_TEST_CASE(query_confirm__is_strong__strong__true)
 {
     settings settings{};
@@ -246,7 +272,7 @@ BOOST_AUTO_TEST_CASE(query_confirm__is_strong__strong__true)
     test::query_accessor query{ store };
     BOOST_REQUIRE_EQUAL(store.create(events_handler), error::success);
     BOOST_REQUIRE(query.initialize(test::genesis));
-    BOOST_REQUIRE(query.is_strong(query.to_spend(0, 0)));
+    BOOST_REQUIRE(query.is_strong(0));
 }
 
 BOOST_AUTO_TEST_CASE(query_confirm__is_strong__weak__false)
@@ -258,9 +284,9 @@ BOOST_AUTO_TEST_CASE(query_confirm__is_strong__weak__false)
     BOOST_REQUIRE_EQUAL(store.create(events_handler), error::success);
     BOOST_REQUIRE(query.initialize(test::genesis));
     BOOST_REQUIRE(query.set(test::block1, context{}));
-    BOOST_REQUIRE(!query.is_strong(query.to_spend(1, 0)));
+    BOOST_REQUIRE(!query.is_strong(1));
     BOOST_REQUIRE(query.set_strong(1));
-    BOOST_REQUIRE(query.is_strong(query.to_spend(1, 0)));
+    BOOST_REQUIRE(query.is_strong(1));
 }
 
 BOOST_AUTO_TEST_CASE(query_confirm__is_spent__unspent__false)
diff --git a/test/query/translate.cpp b/test/query/translate.cpp
index ba023d78..5c129629 100644
--- a/test/query/translate.cpp
+++ b/test/query/translate.cpp
@@ -140,6 +140,21 @@ BOOST_AUTO_TEST_CASE(query_translate__to_header__always__expected)
     BOOST_REQUIRE_EQUAL(query.to_header(test::block1.hash()), 1u);
 }
 
+BOOST_AUTO_TEST_CASE(query_translate__to_coinbase__always__expected)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE_EQUAL(store.create(events_handler), error::success);
+    BOOST_REQUIRE_EQUAL(query.to_header(test::genesis.hash()), header_link::terminal);
+    BOOST_REQUIRE(query.initialize(test::genesis));
+    BOOST_REQUIRE_EQUAL(query.to_coinbase(0), 0u);
+    BOOST_REQUIRE(query.to_coinbase(1).is_terminal());
+    BOOST_REQUIRE(query.set(test::block1, test::context));
+    BOOST_REQUIRE_EQUAL(query.to_coinbase(1), 1u);
+}
+
 // to_point
 
 BOOST_AUTO_TEST_CASE(query_translate__to_point__null_points__empty_points_table)