Validate signet block solutions.

include/bitcoin/node/chasers/chaser_validate.hpp

@@ -184,6 +184,7 @@ class BCN_API chaser_validate
     // These are thread safe.
     const uint32_t subsidy_interval_;
     const uint64_t initial_subsidy_;
+    const system::chain::script signet_challenge_;
     const size_t maximum_backlog_;
     const size_t maximum_height_;
     const uint64_t verify_target_;

src/chasers/chaser_validate.cpp

@@ -41,6 +41,7 @@ chaser_validate::chaser_validate(full_node& node) NOEXCEPT
     validation_strand_(validation_threadpool_.service().get_executor()),
     subsidy_interval_(node.system_settings().subsidy_interval_blocks),
     initial_subsidy_(node.system_settings().initial_subsidy()),
+    signet_challenge_(node.system_settings().signet_challenge),
     maximum_backlog_(node.node_settings().maximum_concurrency_()),
     maximum_height_(node.node_settings().maximum_height_()),
     verify_target_(node.node_settings().batch_verify),

src/chasers/chaser_validate_parallel.cpp

@@ -260,7 +260,7 @@ code chaser_validate::validate(bool& batched, bool& capturing,
     auto& query = archive();
 
     code ec{};
-    if (((ec = block.check())) || ((ec = block.check(ctx))))
+    if (((ec = block.check())) || ((ec = block.check(ctx, signet_challenge_))))
         return ec;
 
     if ((ec = block.accept(ctx, subsidy_interval_, initial_subsidy_)))

src/configuration.cpp

@@ -65,6 +65,14 @@ code configuration::initialize() NOEXCEPT
     if (!node.use_gpu_())
         database.gpu_scan_minimum = max_uint32;
 
+    // The signet message identifier is derived from its challenge [bip325].
+    if (bitcoin.forks.signet)
+    {
+        const auto challenge = bitcoin.signet_challenge.to_data(true);
+        const auto hash = system::bitcoin_hash(challenge);
+        network.identifier = system::from_little_endian<uint32_t>(hash);
+    }
+
     database.initialize(bitcoin, node.limited_blocks, node.silent_start_height);
     return network.initialize();
 }

test/configuration.cpp

@@ -39,6 +39,21 @@ BOOST_AUTO_TEST_CASE(configuration__initialize__mainnet__success_peer_identifier
     BOOST_REQUIRE_EQUAL(instance.network.peer.identifier, 0xd9b4bef9_u32);
 }
 
+BOOST_AUTO_TEST_CASE(configuration__initialize__signet__success_peer_identifier_signet_magic)
+{
+    node::configuration instance(chain::selection::signet);
+    BOOST_REQUIRE(!instance.initialize());
+    BOOST_REQUIRE_EQUAL(instance.network.peer.identifier, 0x40cf030a_u32);
+}
+
+BOOST_AUTO_TEST_CASE(configuration__initialize__custom_signet__success_peer_identifier_challenge_magic)
+{
+    node::configuration instance(chain::selection::signet);
+    instance.bitcoin.signet_challenge = system::config::script{ "1" };
+    BOOST_REQUIRE(!instance.initialize());
+    BOOST_REQUIRE_EQUAL(instance.network.peer.identifier, from_little_endian<uint32_t>(bitcoin_hash(base16_chunk("0151"))));
+}
+
 BOOST_AUTO_TEST_CASE(configuration__initialize__silent_without_witness__silent_unwitnessed)
 {
     node::configuration instance(chain::selection::mainnet);