Provide static v4 tx validation utility for server use.

builds/gnu/Makefile.am

@@ -57,6 +57,7 @@ src_libbitcoin_node_la_SOURCES = \
     ${srcdir}/../../src/estimator.cpp \
     ${srcdir}/../../src/full_node.cpp \
     ${srcdir}/../../src/settings.cpp \
+    ${srcdir}/../../src/validate.cpp \
     ${srcdir}/../../src/channels/channel_peer.cpp \
     ${srcdir}/../../src/chasers/chaser.cpp \
     ${srcdir}/../../src/chasers/chaser_block.cpp \
@@ -114,6 +115,7 @@ include_bitcoin_node_HEADERS = \
     ${srcdir}/../../include/bitcoin/node/events.hpp \
     ${srcdir}/../../include/bitcoin/node/full_node.hpp \
     ${srcdir}/../../include/bitcoin/node/settings.hpp \
+    ${srcdir}/../../include/bitcoin/node/validate.hpp \
     ${srcdir}/../../include/bitcoin/node/version.hpp
 
 include_bitcoin_node_channelsdir = \

builds/msvc/vs2022/libbitcoin-node/libbitcoin-node.vcxproj

@@ -164,6 +164,7 @@
     <ClCompile Include="..\..\..\..\src\sessions\session_manual.cpp" />
     <ClCompile Include="..\..\..\..\src\sessions\session_outbound.cpp" />
     <ClCompile Include="..\..\..\..\src\settings.cpp" />
+    <ClCompile Include="..\..\..\..\src\validate.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\builds\msvc\resource.h" />
@@ -219,6 +220,7 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\node\sessions\session_peer.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\sessions\sessions.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\settings.hpp" />
+    <ClInclude Include="..\..\..\..\include\bitcoin\node\validate.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\version.hpp" />
   </ItemGroup>
   <ItemGroup>

builds/msvc/vs2022/libbitcoin-node/libbitcoin-node.vcxproj.filters

@@ -192,6 +192,9 @@
     <ClCompile Include="..\..\..\..\src\settings.cpp">
       <Filter>src</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\validate.cpp">
+      <Filter>src</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\builds\msvc\resource.h">
@@ -353,6 +356,9 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\node\settings.hpp">
       <Filter>include\bitcoin\node</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\include\bitcoin\node\validate.hpp">
+      <Filter>include\bitcoin\node</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\include\bitcoin\node\version.hpp">
       <Filter>include\bitcoin\node</Filter>
     </ClInclude>

builds/msvc/vs2026/libbitcoin-node/libbitcoin-node.vcxproj

@@ -164,6 +164,7 @@
     <ClCompile Include="..\..\..\..\src\sessions\session_manual.cpp" />
     <ClCompile Include="..\..\..\..\src\sessions\session_outbound.cpp" />
     <ClCompile Include="..\..\..\..\src\settings.cpp" />
+    <ClCompile Include="..\..\..\..\src\validate.cpp" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\builds\msvc\resource.h" />
@@ -219,6 +220,7 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\node\sessions\session_peer.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\sessions\sessions.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\settings.hpp" />
+    <ClInclude Include="..\..\..\..\include\bitcoin\node\validate.hpp" />
     <ClInclude Include="..\..\..\..\include\bitcoin\node\version.hpp" />
   </ItemGroup>
   <ItemGroup>

builds/msvc/vs2026/libbitcoin-node/libbitcoin-node.vcxproj.filters

@@ -192,6 +192,9 @@
     <ClCompile Include="..\..\..\..\src\settings.cpp">
       <Filter>src</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\..\src\validate.cpp">
+      <Filter>src</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="..\..\..\..\builds\msvc\resource.h">
@@ -353,6 +356,9 @@
     <ClInclude Include="..\..\..\..\include\bitcoin\node\settings.hpp">
       <Filter>include\bitcoin\node</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\..\include\bitcoin\node\validate.hpp">
+      <Filter>include\bitcoin\node</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\..\include\bitcoin\node\version.hpp">
       <Filter>include\bitcoin\node</Filter>
     </ClInclude>

include/bitcoin/node.hpp

@@ -26,6 +26,7 @@
 #include <bitcoin/node/events.hpp>
 #include <bitcoin/node/full_node.hpp>
 #include <bitcoin/node/settings.hpp>
+#include <bitcoin/node/validate.hpp>
 #include <bitcoin/node/version.hpp>
 #include <bitcoin/node/channels/channel.hpp>
 #include <bitcoin/node/channels/channel_peer.hpp>

include/bitcoin/node/validate.hpp

@@ -0,0 +1,40 @@
+/**
+ * Copyright (c) 2011-2026 libbitcoin developers
+ *
+ * This file is part of libbitcoin.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef LIBBITCOIN_NODE_VALIDATE_HPP
+#define LIBBITCOIN_NODE_VALIDATE_HPP
+
+#include <bitcoin/node/define.hpp>
+#include <bitcoin/node/full_node.hpp>
+
+namespace libbitcoin {
+namespace node {
+
+/// Transaction validation against the confirmed chain, for services that
+/// accept transactions from clients (there is no tx pool until v5). Shared
+/// by the server protocols, which obtain the context of the next block.
+
+/// Validate tx in the given context, populating its prevout metadata.
+/// Includes the block-rule guards, a DoS guard for standalone validation.
+BCN_API code validate_transaction(const system::chain::transaction& tx,
+    const query& query, const system::chain::context& pool) NOEXCEPT;
+
+} // namespace node
+} // namespace libbitcoin
+
+#endif

src/validate.cpp

@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 2011-2026 libbitcoin developers
+ *
+ * This file is part of libbitcoin.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <bitcoin/node/validate.hpp>
+
+#include <bitcoin/node/define.hpp>
+
+namespace libbitcoin {
+namespace node {
+
+using namespace system;
+
+code validate_transaction(const chain::transaction& tx, const query& query,
+    const chain::context& pool) NOEXCEPT
+{
+    code ec{};
+
+    // Ensure tx does not violate tx consensus rules.
+    if (!ec) ec = tx.check();
+    if (!ec) ec = tx.check(pool);
+    if (!ec) query.populate_with_metadata(tx, true);
+    if (!ec) ec = tx.accept(pool);
+    if (!ec) ec = tx.confirm(pool);
+    if (!ec) ec = tx.connect(pool);
+
+    // Ensure tx does not violate presumed block consensus rules.
+    // This is a DoS guard when validating a tx outside of a block.
+    if (!ec) ec = tx.check_guard();
+    if (!ec) ec = tx.check_guard(pool);
+    if (!ec) ec = tx.accept_guard(pool);
+    return ec;
+}
+
+} // namespace node
+} // namespace libbitcoin