diff --git a/src/p2p_server.cpp b/src/p2p_server.cpp
index 79d835ca..ab659ed8 100644
--- a/src/p2p_server.cpp
+++ b/src/p2p_server.cpp
@@ -1944,11 +1944,9 @@ void P2PServer::P2PClient::send_handshake_solution(const uint8_t (&challenge)[CH
 	}
 }
 
-bool P2PServer::P2PClient::check_handshake_solution(const hash& solution, const uint8_t (&solution_salt)[CHALLENGE_SIZE])
+bool P2PServer::P2PClient::check_handshake_solution(const hash& solution, const uint8_t (&solution_salt)[CHALLENGE_SIZE]) const
 {
-	P2PServer* owner = static_cast<P2PServer*>(m_owner);
-
-	const std::vector<uint8_t>& consensus_id = owner->m_pool->side_chain().consensus_id();
+	const std::vector<uint8_t>& consensus_id = static_cast<const P2PServer*>(m_owner)->m_pool->side_chain().consensus_id();
 	const int consensus_id_size = static_cast<int>(consensus_id.size());
 
 	uint8_t challenge[CHALLENGE_SIZE];
diff --git a/src/p2p_server.h b/src/p2p_server.h
index ea5e91c1..b9173567 100644
--- a/src/p2p_server.h
+++ b/src/p2p_server.h
@@ -101,7 +101,7 @@ class P2PServer : public TCPServer
 
 		[[nodiscard]] bool send_handshake_challenge();
 		void send_handshake_solution(const uint8_t (&challenge)[CHALLENGE_SIZE]);
-		[[nodiscard]] bool check_handshake_solution(const hash& solution, const uint8_t (&solution_salt)[CHALLENGE_SIZE]);
+		[[nodiscard]] bool check_handshake_solution(const hash& solution, const uint8_t (&solution_salt)[CHALLENGE_SIZE]) const;
 
 		[[nodiscard]] bool on_handshake_challenge(const uint8_t* buf);
 		[[nodiscard]] bool on_handshake_solution(const uint8_t* buf);
@@ -115,7 +115,7 @@ class P2PServer : public TCPServer
 		void on_block_notify(const uint8_t* buf);
 
 		[[nodiscard]] bool handle_incoming_block_async(const PoolBlock* block, uint64_t max_time_delta = 0);
-		void handle_incoming_block(p2pool* pool, PoolBlock& block, std::vector<hash>& missing_blocks, bool& result);
+		static void handle_incoming_block(p2pool* pool, PoolBlock& block, std::vector<hash>& missing_blocks, bool& result);
 		void post_handle_incoming_block(p2pool* pool, const PoolBlock& block, const uint32_t reset_counter, bool is_v6, const raw_ip& addr, std::vector<hash>& missing_blocks, const bool result);
 
 		[[nodiscard]] bool is_good() const { return m_handshakeComplete && !m_handshakeInvalid && (m_listenPort >= 0); }
diff --git a/src/p2pool.cpp b/src/p2pool.cpp
index d46a756c..9399790d 100644
--- a/src/p2pool.cpp
+++ b/src/p2pool.cpp
@@ -582,12 +582,12 @@ void p2pool::update_aux_data(const hash& chain_id)
 
 			aux_id.reserve(m_mergeMiningClients.size() + 1);
 
-			IMergeMiningClient::ChainParameters params;
+			IMergeMiningClient::ChainParameters chain_params;
 
 			for (const IMergeMiningClient* c : m_mergeMiningClients) {
-				if (c->get_params(params)) {
-					data.aux_chains.emplace_back(params.aux_id, params.aux_hash, params.aux_diff);
-					aux_id.emplace_back(params.aux_id);
+				if (c->get_params(chain_params)) {
+					data.aux_chains.emplace_back(chain_params.aux_id, chain_params.aux_hash, chain_params.aux_diff);
+					aux_id.emplace_back(chain_params.aux_id);
 				}
 			}
 			aux_id.emplace_back(m_sideChain->consensus_hash());
diff --git a/src/side_chain.cpp b/src/side_chain.cpp
index 5b16d75a..5ff34a9a 100644
--- a/src/side_chain.cpp
+++ b/src/side_chain.cpp
@@ -511,7 +511,6 @@ void SideChain::cleanup_incoming_blocks()
 	MutexLock lock(m_incomingBlocksLock);
 
 	// Forget seen blocks that were added more than 10 minutes ago
-	hash h;
 	for (auto i = m_incomingBlocks.begin(); i != m_incomingBlocks.end();) {
 		if (cur_time < i->second + 10 * 60) {
 			++i;