diff --git a/src/common.h b/src/common.h
index 0fa8944..9655f7b 100644
--- a/src/common.h
+++ b/src/common.h
@@ -122,7 +122,7 @@ constexpr uint8_t MINER_REWARD_UNLOCK_TIME = 60;
 constexpr uint8_t NONCE_SIZE = 4;
 constexpr uint8_t EXTRA_NONCE_SIZE = 4;
 constexpr uint8_t EXTRA_NONCE_MAX_SIZE = EXTRA_NONCE_SIZE + 10;
-constexpr uint8_t TX_VERSION = 4;  // Salvium Carrot v1
+constexpr uint8_t TX_VERSION = 60;
 constexpr uint8_t TXIN_GEN = 0xFF;
 constexpr uint8_t TXOUT_TO_TAGGED_KEY = 3;
 constexpr uint8_t TXOUT_TO_CARROT_V1 = 4;
diff --git a/src/p2pool.cpp b/src/p2pool.cpp
index 8eed988..01b4415 100644
--- a/src/p2pool.cpp
+++ b/src/p2pool.cpp
@@ -1155,6 +1155,14 @@ void p2pool::submit_block() const
 	}
 	else {
 		LOGINFO(0, log::LightGreen() << "submit_block: height = " << height << ", external blob (" << submit_data.blob.size() << " bytes)");
+                std::string hex;
+                hex.reserve(submit_data.blob.size() * 2);
+                for (size_t i = 0; i < std::min<size_t>(submit_data.blob.size(), 400); ++i) {
+                        char buf[3];
+                        snprintf(buf, sizeof(buf), "%02x", submit_data.blob[i]);
+                        hex.append(buf);
+                }
+                LOGINFO(0, "BLOB HEX (first 400 bytes): " << hex);
 		is_external = true;
 	}
 
diff --git a/src/pool_block.cpp b/src/pool_block.cpp
index 9789922..bf384cc 100644
--- a/src/pool_block.cpp
+++ b/src/pool_block.cpp
@@ -228,6 +228,31 @@ std::vector<uint8_t> PoolBlock::serialize_mainchain_data(size_t* header_size, si
 		*miner_tx_size = data.size() - header_size0;
 	}
 
+        // Protocol tx (Salvium Carrot v1+)
+        if (m_majorVersion >= 10) {
+                writeVarint(4, data);  // version = TRANSACTION_VERSION_CARROT
+                writeVarint(60, data);  // unlock_time = 60
+                
+                // vin (1 txin_gen)
+                writeVarint(1, data);  // vin.size() = 1
+                data.push_back(TXIN_GEN);
+                writeVarint(m_txinGenHeight, data);
+                
+                // vout (empty)
+                writeVarint(0, data);  // vout.size() = 0
+                
+                // extra (2 bytes: 0x02 0x00)
+                writeVarint(2, data);  // extra.size() = 2
+                data.push_back(0x02);
+                data.push_back(0x00);
+                
+                // type = PROTOCOL
+                writeVarint(2, data);  // transaction_type::PROTOCOL = 2
+                
+                // rct_signatures (null)
+                data.push_back(0);  // RCTTypeNull
+        }
+
 	writeVarint(m_transactions.size() - 1, data);
 
 #ifdef WITH_INDEXED_HASHES