diff --git a/builds/msvc/vs2013/bs/bs.vcxproj b/builds/msvc/vs2013/bs/bs.vcxproj
index 3e253cf1..b37ad155 100644
--- a/builds/msvc/vs2013/bs/bs.vcxproj
+++ b/builds/msvc/vs2013/bs/bs.vcxproj
@@ -5,7 +5,7 @@
     <PlatformToolset>CTP_Nov2013</PlatformToolset>
     <ProjectGuid>{F45B7D90-90BC-41EF-9AD1-9B29256A09FE}</ProjectGuid>
     <ProjectName>bs</ProjectName>
-    <NuGetPackageImportStamp>d5ab076e</NuGetPackageImportStamp>
+    <NuGetPackageImportStamp>1ef951ad</NuGetPackageImportStamp>
   </PropertyGroup>
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="DebugDEXE|Win32">
@@ -89,8 +89,7 @@
     <Import Project="..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets')" />
     <Import Project="..\..\..\..\..\..\nuget\libsodium_vc120.1.0.0.0\build\native\libsodium_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\libsodium_vc120.1.0.0.0\build\native\libsodium_vc120.targets')" />
     <Import Project="..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets')" />
-    <Import Project="..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets')" />
-    <Import Project="..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets')" />
+    <Import Project="..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -107,8 +106,7 @@
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets'))" />
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\czmq_vc120.3.0.1.0\build\native\czmq_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\czmq_vc120.3.0.1.0\build\native\czmq_vc120.targets'))" />
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets'))" />
-    <Error Condition="!Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets'))" />
-    <Error Condition="!Exists('..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets'))" />
+    <Error Condition="!Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets'))" />
   </Target>
   <ItemGroup>
     <ProjectReference Include="..\libbitcoin-server\libbitcoin-server.vcxproj">
diff --git a/builds/msvc/vs2013/bs/packages.config b/builds/msvc/vs2013/bs/packages.config
index ab35baa5..c73d240e 100644
--- a/builds/msvc/vs2013/bs/packages.config
+++ b/builds/msvc/vs2013/bs/packages.config
@@ -11,6 +11,5 @@
   <package id="czmqpp_vc120" version="1.1.0.0" targetFramework="Native" />
   <package id="libsodium_vc120" version="1.0.0.0" targetFramework="Native" />
   <package id="libzmq_vc120" version="4.2.0.0" targetFramework="Native" />
-  <package id="openssl_no-asm_vc120" version="1.0.1.800" targetFramework="Native" />
-  <package id="secp256k1_vc120" version="0.1.0.8" targetFramework="Native" />
+  <package id="secp256k1_vc120" version="0.1.0.13" targetFramework="Native" />
 </packages>
diff --git a/builds/msvc/vs2013/libbitcoin-server-test/libbitcoin-server-test.vcxproj b/builds/msvc/vs2013/libbitcoin-server-test/libbitcoin-server-test.vcxproj
index a698dcfb..e6320738 100644
--- a/builds/msvc/vs2013/libbitcoin-server-test/libbitcoin-server-test.vcxproj
+++ b/builds/msvc/vs2013/libbitcoin-server-test/libbitcoin-server-test.vcxproj
@@ -5,7 +5,7 @@
     <PlatformToolset>v120</PlatformToolset>
     <ProjectGuid>{66A0E586-2E3A-448F-BCD0-348AFEB0D5EA}</ProjectGuid>
     <ProjectName>libbitcoin-server-test</ProjectName>
-    <NuGetPackageImportStamp>f1d64d8c</NuGetPackageImportStamp>
+    <NuGetPackageImportStamp>e5840320</NuGetPackageImportStamp>
   </PropertyGroup>
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="DebugDEXE|Win32">
@@ -82,8 +82,7 @@
     <Import Project="..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets')" />
     <Import Project="..\..\..\..\..\..\nuget\libsodium_vc120.1.0.0.0\build\native\libsodium_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\libsodium_vc120.1.0.0.0\build\native\libsodium_vc120.targets')" />
     <Import Project="..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets')" />
-    <Import Project="..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets')" />
-    <Import Project="..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets')" />
+    <Import Project="..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -101,8 +100,7 @@
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets'))" />
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\czmq_vc120.3.0.1.0\build\native\czmq_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\czmq_vc120.3.0.1.0\build\native\czmq_vc120.targets'))" />
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets'))" />
-    <Error Condition="!Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets'))" />
-    <Error Condition="!Exists('..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets'))" />
+    <Error Condition="!Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets'))" />
   </Target>
   <ItemGroup>
     <ProjectReference Include="..\libbitcoin-server\libbitcoin-server.vcxproj">
diff --git a/builds/msvc/vs2013/libbitcoin-server-test/packages.config b/builds/msvc/vs2013/libbitcoin-server-test/packages.config
index 56d0796c..c804b268 100644
--- a/builds/msvc/vs2013/libbitcoin-server-test/packages.config
+++ b/builds/msvc/vs2013/libbitcoin-server-test/packages.config
@@ -12,6 +12,5 @@
   <package id="czmqpp_vc120" version="1.1.0.0" targetFramework="Native" />
   <package id="libsodium_vc120" version="1.0.0.0" targetFramework="Native" />
   <package id="libzmq_vc120" version="4.2.0.0" targetFramework="Native" />
-  <package id="openssl_no-asm_vc120" version="1.0.1.800" targetFramework="Native" />
-  <package id="secp256k1_vc120" version="0.1.0.8" targetFramework="Native" />
+  <package id="secp256k1_vc120" version="0.1.0.13" targetFramework="Native" />
 </packages>
diff --git a/builds/msvc/vs2013/libbitcoin-server/libbitcoin-server.vcxproj b/builds/msvc/vs2013/libbitcoin-server/libbitcoin-server.vcxproj
index 1e3ce44c..a0ae0c76 100644
--- a/builds/msvc/vs2013/libbitcoin-server/libbitcoin-server.vcxproj
+++ b/builds/msvc/vs2013/libbitcoin-server/libbitcoin-server.vcxproj
@@ -4,7 +4,7 @@
     <PlatformToolset>CTP_Nov2013</PlatformToolset>
     <ProjectGuid>{73CE0AC2-ECB2-4E8D-A136-17840C0371A0}</ProjectGuid>
     <ProjectName>libbitcoin-server</ProjectName>
-    <NuGetPackageImportStamp>d5ab076e</NuGetPackageImportStamp>
+    <NuGetPackageImportStamp>5a63dbf2</NuGetPackageImportStamp>
   </PropertyGroup>
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="DebugDLL|Win32">
@@ -122,8 +122,7 @@
     <Import Project="..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets')" />
     <Import Project="..\..\..\..\..\..\nuget\libsodium_vc120.1.0.0.0\build\native\libsodium_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\libsodium_vc120.1.0.0.0\build\native\libsodium_vc120.targets')" />
     <Import Project="..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets')" />
-    <Import Project="..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets')" />
-    <Import Project="..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets')" />
+    <Import Project="..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets" Condition="Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets')" />
   </ImportGroup>
   <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
     <PropertyGroup>
@@ -140,7 +139,6 @@
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\libzmq_vc120.4.2.0.0\build\native\libzmq_vc120.targets'))" />
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\czmq_vc120.3.0.1.0\build\native\czmq_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\czmq_vc120.3.0.1.0\build\native\czmq_vc120.targets'))" />
     <Error Condition="!Exists('..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\czmqpp_vc120.1.1.0.0\build\native\czmqpp_vc120.targets'))" />
-    <Error Condition="!Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.8\build\native\secp256k1_vc120.targets'))" />
-    <Error Condition="!Exists('..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\openssl_no-asm_vc120.1.0.1.800\build\native\openssl_no-asm_vc120.targets'))" />
+    <Error Condition="!Exists('..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\..\nuget\secp256k1_vc120.0.1.0.13\build\native\secp256k1_vc120.targets'))" />
   </Target>
 </Project>
\ No newline at end of file
diff --git a/builds/msvc/vs2013/libbitcoin-server/packages.config b/builds/msvc/vs2013/libbitcoin-server/packages.config
index ab35baa5..c73d240e 100644
--- a/builds/msvc/vs2013/libbitcoin-server/packages.config
+++ b/builds/msvc/vs2013/libbitcoin-server/packages.config
@@ -11,6 +11,5 @@
   <package id="czmqpp_vc120" version="1.1.0.0" targetFramework="Native" />
   <package id="libsodium_vc120" version="1.0.0.0" targetFramework="Native" />
   <package id="libzmq_vc120" version="4.2.0.0" targetFramework="Native" />
-  <package id="openssl_no-asm_vc120" version="1.0.1.800" targetFramework="Native" />
-  <package id="secp256k1_vc120" version="0.1.0.8" targetFramework="Native" />
+  <package id="secp256k1_vc120" version="0.1.0.13" targetFramework="Native" />
 </packages>
diff --git a/configure.ac b/configure.ac
index 93b4db76..b6b96ae6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -7,9 +7,7 @@
 
 # Standard declarations.
 #==============================================================================
-# Requires Automake 1.14 or newer.
-
-# Declare the required version of Autoconf.
+# Declare the required version of autoconf.
 AC_PREREQ([2.65])
 
 # Process command-line arguments and perform initialization and verification.
diff --git a/install.sh b/install.sh
index b02d842d..83596b17 100755
--- a/install.sh
+++ b/install.sh
@@ -240,7 +240,8 @@ CZMQPP_OPTIONS=\
 # Define secp256k1 options.
 #------------------------------------------------------------------------------
 SECP256K1_OPTIONS=\
-"--disable-tests "
+"--disable-tests "\
+"--enable-module-recovery "
 
 # Define bitcoin options.
 #------------------------------------------------------------------------------
@@ -593,7 +594,7 @@ build_all()
     build_from_github zeromq libzmq master $PARALLEL "$@" $ZMQ_OPTIONS
     build_from_github zeromq czmq master $PARALLEL "$@" $CZMQ_OPTIONS
     build_from_github zeromq czmqpp master $PARALLEL "$@" $CZMQPP_OPTIONS
-    build_from_github libbitcoin secp256k1 version3 $PARALLEL "$@" $SECP256K1_OPTIONS
+    build_from_github libbitcoin secp256k1 version4 $PARALLEL "$@" $SECP256K1_OPTIONS
     build_from_github libbitcoin libbitcoin version2 $PARALLEL "$@" $BITCOIN_OPTIONS
     build_from_github libbitcoin libbitcoin-consensus version1 $PARALLEL "$@" $BITCOIN_CONSENSUS_OPTIONS
     build_from_github libbitcoin libbitcoin-blockchain version2 $PARALLEL "$@" $BITCOIN_BLOCKCHAIN_OPTIONS