diff --git a/README.md b/README.md
index edea1ad62..401129443 100644
--- a/README.md
+++ b/README.md
@@ -97,7 +97,7 @@ Dates are provided in the format YYYY-MM-DD.
 | 253,999                       | 2020-10-09 | Illiterate Illuminati    | v0.9.0.0                | v0.9.3.3                    | Dynamic coinbase unlock (up to 1 mo.), Deterministic unlock times, Enforce maximum coinbase amount, show_qr_code wallet command, CLSAG
 | 331,170                       | 2021-07-04 | Junkie Jeff              | v0.10.0.0               | v0.10.2.0                   | Bulletproofs+, Miner Block Header Signing, Vote by Block, Change coinbase unlock time to 1 day, Reset difficulty and switch back to Monero's difficulty algorithm
 | 514,000                       | 2023-04-01 | Kunty Karen              | v0.11.0.0               | v0.11.0.1                   | View tags, fee changes, adjusted dynamic block weight algorithm, multisig security fixes, RPC broadcast node donation sub-address, Limit tx_extra max size to ~1kb, 12-hour difficulty adjustment window
-| 528,888                       | 2023-05-23 | XXXXX                    | v0.12.0.0               | v0.12.0.0                   | Reset difficulty and switch back to Monero's difficulty algorithm
+| 528,888                       | 2023-05-23 | XXXXX                    | v0.12.0.0               | v0.12.0.0                   | Reset difficulty and switch back to Monero's difficulty algorithm, Enable pool mining
 
 X's indicate that these details have not been determined as of commit date.
 
diff --git a/src/cryptonote_basic/cryptonote_basic.h b/src/cryptonote_basic/cryptonote_basic.h
index 215903a0c..024758a63 100644
--- a/src/cryptonote_basic/cryptonote_basic.h
+++ b/src/cryptonote_basic/cryptonote_basic.h
@@ -470,7 +470,7 @@ namespace cryptonote
       VARINT_FIELD(timestamp)
       FIELD(prev_id)
       FIELD(nonce)
-      if (major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG)
+      if (major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG && major_version < HF_VERSION_END_BLOCK_HEADER_MINER_SIG)
       {
           FIELD(signature)
           FIELD(vote)
diff --git a/src/cryptonote_basic/cryptonote_boost_serialization.h b/src/cryptonote_basic/cryptonote_boost_serialization.h
index 6d2b7e55b..a4b20ba4e 100644
--- a/src/cryptonote_basic/cryptonote_boost_serialization.h
+++ b/src/cryptonote_basic/cryptonote_boost_serialization.h
@@ -196,7 +196,7 @@ namespace boost
     a & b.timestamp;
     a & b.prev_id;
     a & b.nonce;
-    if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG)
+    if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG && b.major_version < HF_VERSION_END_BLOCK_HEADER_MINER_SIG)
     {
       a & b.signature;
       a & b.vote;
diff --git a/src/cryptonote_basic/miner.cpp b/src/cryptonote_basic/miner.cpp
index 83bea8b5b..13e651456 100644
--- a/src/cryptonote_basic/miner.cpp
+++ b/src/cryptonote_basic/miner.cpp
@@ -613,7 +613,7 @@ namespace cryptonote
       b.nonce = nonce;
 
       // Miner Block Header Signing
-      if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG)
+      if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG && b.major_version < HF_VERSION_END_BLOCK_HEADER_MINER_SIG)
       {
         // tx key derivation
         crypto::key_derivation derivation;
diff --git a/src/cryptonote_config.h b/src/cryptonote_config.h
index 937218a2d..9196e14e4 100644
--- a/src/cryptonote_config.h
+++ b/src/cryptonote_config.h
@@ -199,6 +199,7 @@
 #define HF_VERSION_VIEW_TAGS                    20
 #define HF_VERSION_2021_SCALING                 20
 #define HF_VERSION_CAP_TX_EXTRA_SIZE            20
+#define HF_VERSION_END_BLOCK_HEADER_MINER_SIG   21
 
 #define PER_KB_FEE_QUANTIZATION_DECIMALS        8
 #define CRYPTONOTE_SCALING_2021_FEE_ROUNDING_PLACES 2
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index a7365662e..2b06869fe 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -1415,7 +1415,7 @@ difficulty_type Blockchain::get_next_difficulty_for_alternative_chain(const std:
 bool Blockchain::prevalidate_miner_transaction(const block& b, uint64_t height, uint8_t hf_version)
 {
   // Miner Block Header Signing
-  if (hf_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG)
+  if (hf_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG && hf_version < HF_VERSION_END_BLOCK_HEADER_MINER_SIG)
   {
       // sanity checks
       if (b.miner_tx.vout.size() != 1)
diff --git a/src/rpc/core_rpc_server.cpp b/src/rpc/core_rpc_server.cpp
index 9cee51133..4bac1e817 100644
--- a/src/rpc/core_rpc_server.cpp
+++ b/src/rpc/core_rpc_server.cpp
@@ -2193,7 +2193,7 @@ namespace cryptonote
         return false;
       }
       b.nonce = req.starting_nonce;
-      if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG)
+      if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG && b.major_version < HF_VERSION_END_BLOCK_HEADER_MINER_SIG)
       {
           b.signature = {};
           b.vote = 0;
diff --git a/src/rpc/daemon_handler.cpp b/src/rpc/daemon_handler.cpp
index 2acc66bd6..7c58e87eb 100644
--- a/src/rpc/daemon_handler.cpp
+++ b/src/rpc/daemon_handler.cpp
@@ -895,7 +895,7 @@ namespace rpc
     header.minor_version = b.minor_version;
     header.timestamp = b.timestamp;
     header.nonce = b.nonce;
-    if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG)
+    if (b.major_version >= HF_VERSION_BLOCK_HEADER_MINER_SIG && b.major_version < HF_VERSION_END_BLOCK_HEADER_MINER_SIG)
     {
       header.signature = b.signature;
       header.vote = b.vote;