diff --git a/builds/msvc/vs2026/libbitcoin-database-test/libbitcoin-database-test.vcxproj b/builds/msvc/vs2026/libbitcoin-database-test/libbitcoin-database-test.vcxproj
index de8a3922..58241b51 100644
--- a/builds/msvc/vs2026/libbitcoin-database-test/libbitcoin-database-test.vcxproj
+++ b/builds/msvc/vs2026/libbitcoin-database-test/libbitcoin-database-test.vcxproj
@@ -236,7 +236,7 @@
     <Import Project="$(NuGetPackageRoot)libbitcoin-boost_unit_test_framework-vc145.1.91.0\build\libbitcoin-boost_unit_test_framework-vc145.targets" Condition="Exists('$(NuGetPackageRoot)libbitcoin-boost_unit_test_framework-vc145.1.91.0\build\libbitcoin-boost_unit_test_framework-vc145.targets')" />
     <Import Project="$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets" Condition="Exists('$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets')" />
     <Import Project="$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets" Condition="Exists('$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets')" />
-    <Import Project="$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets" Condition="Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets')" />
+    <Import Project="$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets" Condition="Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -252,7 +252,7 @@
     <Error Condition="!Exists('$(NuGetPackageRoot)libbitcoin-boost_unit_test_framework-vc145.1.91.0\build\libbitcoin-boost_unit_test_framework-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)libbitcoin-boost_unit_test_framework-vc145.1.91.0\build\libbitcoin-boost_unit_test_framework-vc145.targets'))" />
     <Error Condition="!Exists('$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets'))" />
     <Error Condition="!Exists('$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets'))" />
-    <Error Condition="!Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets'))" />
+    <Error Condition="!Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets'))" />
   </Target>
   <ItemGroup>
     <ProjectReference Include="..\libbitcoin-database\libbitcoin-database.vcxproj">
diff --git a/builds/msvc/vs2026/libbitcoin-database-test/packages.config b/builds/msvc/vs2026/libbitcoin-database-test/packages.config
index a31e6417..ed441d53 100644
--- a/builds/msvc/vs2026/libbitcoin-database-test/packages.config
+++ b/builds/msvc/vs2026/libbitcoin-database-test/packages.config
@@ -6,7 +6,7 @@
  |
  -->
 <packages>
-  <package id="UltrafastSecp256k1-vc145" version="4.1.1.7" targetFramework="Native" />
+  <package id="UltrafastSecp256k1-vc145" version="4.3.0.3" targetFramework="Native" />
   <package id="libbitcoin-boost" version="1.91.0" targetFramework="Native" />
   <package id="libbitcoin-boost_container-vc145" version="1.91.0" targetFramework="Native" />
   <package id="libbitcoin-boost_iostreams-vc145" version="1.91.0" targetFramework="Native" />
diff --git a/builds/msvc/vs2026/libbitcoin-database-tools/libbitcoin-database-tools.vcxproj b/builds/msvc/vs2026/libbitcoin-database-tools/libbitcoin-database-tools.vcxproj
index 02643e5d..da24ea75 100644
--- a/builds/msvc/vs2026/libbitcoin-database-tools/libbitcoin-database-tools.vcxproj
+++ b/builds/msvc/vs2026/libbitcoin-database-tools/libbitcoin-database-tools.vcxproj
@@ -139,7 +139,7 @@
     <Import Project="$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets" Condition="Exists('$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets')" />
     <Import Project="$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets" Condition="Exists('$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets')" />
     <Import Project="$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets" Condition="Exists('$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets')" />
-    <Import Project="$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets" Condition="Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets')" />
+    <Import Project="$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets" Condition="Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -154,7 +154,7 @@
     <Error Condition="!Exists('$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets'))" />
     <Error Condition="!Exists('$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets'))" />
     <Error Condition="!Exists('$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets'))" />
-    <Error Condition="!Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets'))" />
+    <Error Condition="!Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets'))" />
   </Target>
   <ItemGroup>
     <ProjectReference Include="..\libbitcoin-database\libbitcoin-database.vcxproj">
diff --git a/builds/msvc/vs2026/libbitcoin-database-tools/packages.config b/builds/msvc/vs2026/libbitcoin-database-tools/packages.config
index bd16f25f..06a4118e 100644
--- a/builds/msvc/vs2026/libbitcoin-database-tools/packages.config
+++ b/builds/msvc/vs2026/libbitcoin-database-tools/packages.config
@@ -6,7 +6,7 @@
  |
  -->
 <packages>
-  <package id="UltrafastSecp256k1-vc145" version="4.1.1.7" targetFramework="Native" />
+  <package id="UltrafastSecp256k1-vc145" version="4.3.0.3" targetFramework="Native" />
   <package id="libbitcoin-boost" version="1.91.0" targetFramework="Native" />
   <package id="libbitcoin-boost_container-vc145" version="1.91.0" targetFramework="Native" />
   <package id="libbitcoin-boost_iostreams-vc145" version="1.91.0" targetFramework="Native" />
diff --git a/builds/msvc/vs2026/libbitcoin-database/libbitcoin-database.vcxproj b/builds/msvc/vs2026/libbitcoin-database/libbitcoin-database.vcxproj
index 7c21739a..d9d11598 100644
--- a/builds/msvc/vs2026/libbitcoin-database/libbitcoin-database.vcxproj
+++ b/builds/msvc/vs2026/libbitcoin-database/libbitcoin-database.vcxproj
@@ -295,7 +295,7 @@
     <Import Project="$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets" Condition="Exists('$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets')" />
     <Import Project="$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets" Condition="Exists('$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets')" />
     <Import Project="$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets" Condition="Exists('$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets')" />
-    <Import Project="$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets" Condition="Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets')" />
+    <Import Project="$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets" Condition="Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -310,7 +310,7 @@
     <Error Condition="!Exists('$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)libbitcoin-boost_thread-vc145.1.91.0\build\libbitcoin-boost_thread-vc145.targets'))" />
     <Error Condition="!Exists('$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)libbitcoin-boost_url-vc145.1.91.0\build\libbitcoin-boost_url-vc145.targets'))" />
     <Error Condition="!Exists('$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)secp256k1_vc145.0.6.1.2\build\native\secp256k1_vc145.targets'))" />
-    <Error Condition="!Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.1.1.7\build\native\UltrafastSecp256k1-vc145.targets'))" />
+    <Error Condition="!Exists('$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(NuGetPackageRoot)UltrafastSecp256k1-vc145.4.3.0.3\build\native\UltrafastSecp256k1-vc145.targets'))" />
   </Target>
   <ItemGroup>
     <Natvis Include="..\..\debug.natvis" />
diff --git a/builds/msvc/vs2026/libbitcoin-database/packages.config b/builds/msvc/vs2026/libbitcoin-database/packages.config
index bd16f25f..06a4118e 100644
--- a/builds/msvc/vs2026/libbitcoin-database/packages.config
+++ b/builds/msvc/vs2026/libbitcoin-database/packages.config
@@ -6,7 +6,7 @@
  |
  -->
 <packages>
-  <package id="UltrafastSecp256k1-vc145" version="4.1.1.7" targetFramework="Native" />
+  <package id="UltrafastSecp256k1-vc145" version="4.3.0.3" targetFramework="Native" />
   <package id="libbitcoin-boost" version="1.91.0" targetFramework="Native" />
   <package id="libbitcoin-boost_container-vc145" version="1.91.0" targetFramework="Native" />
   <package id="libbitcoin-boost_iostreams-vc145" version="1.91.0" targetFramework="Native" />
diff --git a/test/query/signatures.cpp b/test/query/signatures.cpp
index 22641390..fd1bc21b 100644
--- a/test/query/signatures.cpp
+++ b/test/query/signatures.cpp
@@ -84,21 +84,24 @@ BOOST_AUTO_TEST_CASE(query__verify_ecdsa_signatures__various__expected_links)
     test::query_accessor query{ store };
     constexpr auto expected1 = 42u;
     constexpr auto expected2 = 24u;
-    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 42));
-    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 42));
+    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 1));
+    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 2));
     BOOST_REQUIRE(query.set_signature(sighash_bad,   ecdsa_compressed, ecdsa_signature, expected1));
-    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 42));
-    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 42));
+    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 3));
+    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 4));
     BOOST_REQUIRE(query.set_signature(sighash_bad,   ecdsa_compressed, ecdsa_signature, expected2));
-    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 42));
-    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 42));
+    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 5));
+    BOOST_REQUIRE(query.set_signature(ecdsa_sighash, ecdsa_compressed, ecdsa_signature, 6));
 
     header_links links{};
     BOOST_REQUIRE_EQUAL(query.ecdsa_records(), 8u);
     BOOST_REQUIRE(query.verify_ecdsa_signatures(links));
     BOOST_REQUIRE_EQUAL(links.size(), 2u);
-    BOOST_REQUIRE_EQUAL(links.front(), expected1);
-    BOOST_REQUIRE_EQUAL(links.back(), expected2);
+
+    // Order is not guaranteed.
+    const auto back = links.back();
+    const auto front = links.front();
+    BOOST_REQUIRE((front == expected1 && back == expected2) || (front == expected2 && back == expected1));
 }
 
 // schnorr
@@ -159,21 +162,24 @@ BOOST_AUTO_TEST_CASE(query__verify_schnorr_signatures__various__expected_links)
     test::query_accessor query{ store };
     constexpr auto expected1 = 42u;
     constexpr auto expected2 = 24u;
-    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 42));
-    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 42));
+    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 1));
+    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 2));
     BOOST_REQUIRE(query.set_signature(sighash_bad,     schnorr_xonly, schnorr_signature, expected1));
-    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 42));
-    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 42));
+    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 3));
+    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 4));
     BOOST_REQUIRE(query.set_signature(sighash_bad,     schnorr_xonly, schnorr_signature, expected2));
-    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 42));
-    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 42));
+    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 5));
+    BOOST_REQUIRE(query.set_signature(schnorr_sighash, schnorr_xonly, schnorr_signature, 6));
 
     header_links links{};
     BOOST_REQUIRE_EQUAL(query.schnorr_records(), 8u);
     BOOST_REQUIRE(query.verify_schnorr_signatures(links));
     BOOST_REQUIRE_EQUAL(links.size(), 2u);
-    BOOST_REQUIRE_EQUAL(links.front(), expected1);
-    BOOST_REQUIRE_EQUAL(links.back(), expected2);
+
+    // Order is not guaranteed.
+    const auto back = links.back();
+    const auto front = links.front();
+    BOOST_REQUIRE((front == expected1 && back == expected2) || (front == expected2 && back == expected1));
 }
 
 BOOST_AUTO_TEST_SUITE_END()