diff --git a/include/bitcoin/database/error.hpp b/include/bitcoin/database/error.hpp
index e28e8b435..bf7cf27bf 100644
--- a/include/bitcoin/database/error.hpp
+++ b/include/bitcoin/database/error.hpp
@@ -98,6 +98,7 @@ enum error_t : uint8_t
     tx_connected,
     tx_disconnected,
     block_valid,
+    block_prevalid,
     block_confirmable,
     block_unconfirmable,
     unassociated,
diff --git a/include/bitcoin/database/impl/query/consensus/consensus_forks.ipp b/include/bitcoin/database/impl/query/consensus/consensus_forks.ipp
index 74b4e3b3a..b405e17a3 100644
--- a/include/bitcoin/database/impl/query/consensus/consensus_forks.ipp
+++ b/include/bitcoin/database/impl/query/consensus/consensus_forks.ipp
@@ -25,6 +25,45 @@
 namespace libbitcoin {
 namespace database {
 
+// get_prevalids
+// ----------------------------------------------------------------------------
+// startup query (reorg safety not required)
+
+TEMPLATE
+header_links CLASS::get_prevalids(size_t fork_point) const NOEXCEPT
+{
+    header_links out{};
+    auto height = fork_point;
+
+    while (true)
+    {
+        const auto link = to_candidate(++height);
+        if (link.is_terminal())
+            break;
+
+        switch (get_block_state(link).value())
+        {
+            case error::block_prevalid:
+            {
+                out.push_back(link);
+                break;
+            }
+
+            case error::unassociated:
+            case error::block_unconfirmable:
+                return out;
+
+            ////case error::bypassed:
+            ////case error::unvalidated:
+            ////case error::block_valid:
+            ////case error::block_confirmable:
+            default:;
+        }
+    }
+
+    return out;
+}
+
 // get_confirmed
 // ----------------------------------------------------------------------------
 
@@ -133,8 +172,10 @@ header_states CLASS::get_validated_fork(size_t& fork_point,
     fork_point = get_fork_();
     auto height = add1(fork_point);
     auto link = to_candidate(height);
-    while (is_block_validated(ec, link, height, top_checkpoint) &&
-        (!filter || is_filtered_body(link)))
+
+    // Filter body always written before validated, so the check is redundant.
+    while (is_block_validated(ec, link, height, top_checkpoint)
+        /*&& (!filter || is_filtered_body(link))*/)
     {
         out.emplace_back(link, ec);
         link = to_candidate(++height);
diff --git a/include/bitcoin/database/impl/query/consensus/consensus_states.ipp b/include/bitcoin/database/impl/query/consensus/consensus_states.ipp
index 867b95ac5..74ad170ff 100644
--- a/include/bitcoin/database/impl/query/consensus/consensus_states.ipp
+++ b/include/bitcoin/database/impl/query/consensus/consensus_states.ipp
@@ -43,6 +43,7 @@ bool CLASS::is_validateable(size_t height) const NOEXCEPT
     return
         (ec == database::error::unvalidated) ||
         (ec == database::error::block_valid) ||
+        (ec == database::error::block_prevalid) ||
         (ec == database::error::unknown_state) ||
         (ec == database::error::block_confirmable);
 }
@@ -58,6 +59,10 @@ inline code CLASS::to_block_code(
         case block_state::valid:
             return error::block_valid;
 
+        // Transitional: Satisfies validation rules if signatures verify.
+        case block_state::prevalid:
+            return error::block_prevalid;
+
         // Final: Satisfies confirmation rules (prevouts confirmable).
         case block_state::confirmable:
             return error::block_confirmable;
@@ -134,6 +139,7 @@ code CLASS::get_header_state(const header_link& link) const NOEXCEPT
 // unassociated
 // unvalidated
 // block_valid
+// block_prevalid
 // block_confirmable
 // block_unconfirmable
 TEMPLATE
@@ -227,6 +233,12 @@ bool CLASS::set_block_valid(const header_link& link) NOEXCEPT
     return set_block_state(link, block_state::valid);
 }
 
+TEMPLATE
+bool CLASS::set_block_prevalid(const header_link& link) NOEXCEPT
+{
+    return set_block_state(link, block_state::prevalid);
+}
+
 TEMPLATE
 bool CLASS::set_block_confirmable(const header_link& link) NOEXCEPT
 {
diff --git a/include/bitcoin/database/query.hpp b/include/bitcoin/database/query.hpp
index 3179aab0f..694beed8f 100644
--- a/include/bitcoin/database/query.hpp
+++ b/include/bitcoin/database/query.hpp
@@ -569,6 +569,7 @@ class query
 
     /// Setters.
     bool set_block_valid(const header_link& link) NOEXCEPT;
+    bool set_block_prevalid(const header_link& link) NOEXCEPT;
     bool set_block_unconfirmable(const header_link& link) NOEXCEPT;
     bool set_block_confirmable(const header_link& link) NOEXCEPT;
     bool set_block_unknown(const header_link& link) NOEXCEPT;
@@ -665,6 +666,7 @@ class query
     header_links get_confirmed_headers(size_t first,
         size_t limit) const NOEXCEPT;
 
+    header_links get_prevalids(size_t fork_point) const NOEXCEPT;
     height_link get_confirmed_height(const header_link& link) const NOEXCEPT;
     header_links get_confirmed_fork(const header_link& fork) const NOEXCEPT;
     header_links get_candidate_fork(size_t& fork_point) const NOEXCEPT;
diff --git a/include/bitcoin/database/types/block_state.hpp b/include/bitcoin/database/types/block_state.hpp
index 3cd510be2..471cad4bd 100644
--- a/include/bitcoin/database/types/block_state.hpp
+++ b/include/bitcoin/database/types/block_state.hpp
@@ -32,8 +32,11 @@ enum block_state : uint8_t
     /// transitional
     valid = 1,
 
+    /// transitional
+    prevalid = 2,
+
     /// final
-    unconfirmable = 2,
+    unconfirmable = 3,
 
     /// transitional (debug)
     block_unknown = 42
diff --git a/src/error.cpp b/src/error.cpp
index c5c070ee0..9b3ee9a27 100644
--- a/src/error.cpp
+++ b/src/error.cpp
@@ -92,6 +92,7 @@ DEFINE_ERROR_T_MESSAGE_MAP(error)
     { tx_connected, "transaction connected" },
     { tx_disconnected, "transaction disconnected" },
     { block_valid, "block valid" },
+    { block_prevalid, "block prevalid" },
     { block_confirmable, "block confirmable" },
     { block_unconfirmable, "block unconfirmable" },
     { unassociated, "unassociated" },
diff --git a/test/error.cpp b/test/error.cpp
index ca911ab23..6f2a61337 100644
--- a/test/error.cpp
+++ b/test/error.cpp
@@ -468,6 +468,15 @@ BOOST_AUTO_TEST_CASE(error_t__code__block_valid__true_expected_message)
     BOOST_REQUIRE_EQUAL(ec.message(), "block valid");
 }
 
+BOOST_AUTO_TEST_CASE(error_t__code__block_prevalid__true_expected_message)
+{
+    constexpr auto value = error::block_prevalid;
+    const auto ec = code(value);
+    BOOST_REQUIRE(ec);
+    BOOST_REQUIRE(ec == value);
+    BOOST_REQUIRE_EQUAL(ec.message(), "block prevalid");
+}
+
 BOOST_AUTO_TEST_CASE(error_t__code__block_confirmable__true_expected_message)
 {
     constexpr auto value = error::block_confirmable;
diff --git a/test/query/confirmed.cpp b/test/query/confirmed.cpp
index 9c9396d82..f62539d02 100644
--- a/test/query/confirmed.cpp
+++ b/test/query/confirmed.cpp
@@ -22,6 +22,170 @@
 
 BOOST_FIXTURE_TEST_SUITE(query_confirmed_tests, test::directory_setup_fixture)
 
+static void push_chain(test::query_accessor& query)
+{
+    BOOST_REQUIRE(query.initialize(test::genesis));
+    BOOST_REQUIRE(query.set(test::block1, context{ 0, 1, 0 }, false, false));
+    BOOST_REQUIRE(query.set(test::block2, context{ 0, 2, 0 }, false, false));
+    BOOST_REQUIRE(query.push_candidate(1));
+    BOOST_REQUIRE(query.push_candidate(2));
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__empty_chain__empty)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    BOOST_REQUIRE(query.initialize(test::genesis));
+    BOOST_REQUIRE(query.get_prevalids(0).empty());
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__no_prevalids__empty)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    push_chain(query);
+
+    BOOST_REQUIRE(query.get_prevalids(0).empty());
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__single_prevalid__one_link)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    push_chain(query);
+
+    const auto link1 = query.to_candidate(1);
+    BOOST_REQUIRE(query.set_block_prevalid(link1));
+
+    const auto out = query.get_prevalids(0);
+    BOOST_REQUIRE_EQUAL(out.size(), 1u);
+    BOOST_REQUIRE(out.front() == link1);
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__two_prevalids__both_links)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    push_chain(query);
+
+    const auto link1 = query.to_candidate(1);
+    const auto link2 = query.to_candidate(2);
+    BOOST_REQUIRE(query.set_block_prevalid(link1));
+    BOOST_REQUIRE(query.set_block_prevalid(link2));
+
+    const auto out = query.get_prevalids(0);
+    BOOST_REQUIRE_EQUAL(out.size(), 2u);
+    BOOST_REQUIRE(out.front() == link1);
+    BOOST_REQUIRE(out.back() == link2);
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__valid_below_prevalid__collects_prevalid)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    push_chain(query);
+
+    const auto link1 = query.to_candidate(1);
+    const auto link2 = query.to_candidate(2);
+
+    BOOST_REQUIRE(query.set_block_valid(link1));
+    BOOST_REQUIRE(query.set_block_prevalid(link2));
+
+    const auto out = query.get_prevalids(0);
+    BOOST_REQUIRE_EQUAL(out.size(), 1u);
+    BOOST_REQUIRE(out.front() == link2);
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__confirmable_below_prevalid__collects_prevalid)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    push_chain(query);
+
+    const auto link1 = query.to_candidate(1);
+    const auto link2 = query.to_candidate(2);
+
+    BOOST_REQUIRE(query.set_block_confirmable(link1));
+    BOOST_REQUIRE(query.set_block_prevalid(link2));
+
+    const auto out = query.get_prevalids(0);
+    BOOST_REQUIRE_EQUAL(out.size(), 1u);
+    BOOST_REQUIRE(out.front() == link2);
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__fork_above_prevalid__excludes_below)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    push_chain(query);
+
+    const auto link1 = query.to_candidate(1);
+    const auto link2 = query.to_candidate(2);
+    BOOST_REQUIRE(query.set_block_prevalid(link1));
+    BOOST_REQUIRE(query.set_block_prevalid(link2));
+
+    const auto out = query.get_prevalids(1);
+    BOOST_REQUIRE_EQUAL(out.size(), 1u);
+    BOOST_REQUIRE(out.front() == link2);
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__unconfirmable_stops__excludes_above)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    push_chain(query);
+
+    const auto link1 = query.to_candidate(1);
+    const auto link2 = query.to_candidate(2);
+
+    BOOST_REQUIRE(query.set_block_unconfirmable(link1));
+    BOOST_REQUIRE(query.set_block_prevalid(link2));
+    BOOST_REQUIRE(query.get_prevalids(0).empty());
+}
+
+BOOST_AUTO_TEST_CASE(query_prevalids__get_prevalids__unassociated_stops__excludes_above)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+
+    BOOST_REQUIRE(query.initialize(test::genesis));
+    BOOST_REQUIRE(query.set(test::block1.header(), context{ 0, 1, 0 }, false));
+    BOOST_REQUIRE(query.set(test::block2, context{ 0, 2, 0 }, false, false));
+    BOOST_REQUIRE(query.push_candidate(1));
+    BOOST_REQUIRE(query.push_candidate(2));
+
+    const auto link2 = query.to_candidate(2);
+    BOOST_REQUIRE(query.set_block_prevalid(query.to_candidate(2)));
+    BOOST_REQUIRE(query.get_prevalids(0).empty());
+}
+
 BOOST_AUTO_TEST_CASE(query_confirmed__is_candidate_block__push_pop_candidate__expected)
 {
     settings settings{};
diff --git a/test/query/properties_block.cpp b/test/query/properties_block.cpp
index 71043e9a9..ad76cc9b6 100644
--- a/test/query/properties_block.cpp
+++ b/test/query/properties_block.cpp
@@ -240,6 +240,21 @@ BOOST_AUTO_TEST_CASE(query_properties_block__get_block_state__valid__block_valid
     BOOST_REQUIRE_EQUAL(query.get_block_state(1), error::block_valid);
 }
 
+BOOST_AUTO_TEST_CASE(query_properties_block__get_block_state__prevalid__block_prevalid)
+{
+    settings settings{};
+    settings.path = TEST_DIRECTORY;
+    test::chunk_store store{ settings };
+    test::query_accessor query{ store };
+    BOOST_REQUIRE(!store.create(test::events_handler));
+    BOOST_REQUIRE(query.initialize(test::genesis));
+    BOOST_REQUIRE(query.set(test::block1, context{}, false, false));
+
+    BOOST_REQUIRE(query.set_block_prevalid(1));
+    BOOST_REQUIRE_EQUAL(query.get_header_state(1), error::block_prevalid);
+    BOOST_REQUIRE_EQUAL(query.get_block_state(1), error::block_prevalid);
+}
+
 BOOST_AUTO_TEST_CASE(query_properties_block__get_block_state__unconfirmable__block_unconfirmable)
 {
     settings settings{};