diff --git a/contrib/devtools/chainparams/abc/chainparams_main.txt b/contrib/devtools/chainparams/abc/chainparams_main.txt
index d80480cfb..f894062fa 100644
--- a/contrib/devtools/chainparams/abc/chainparams_main.txt
+++ b/contrib/devtools/chainparams/abc/chainparams_main.txt
@@ -1,4 +1,4 @@
-00000000000000000d28c3b3e1bdc796d599218c3ca96d79139b154bcf6b7f86
-0000000000000000000000000000000000000000015356daa9169b9ad57e7e90
-207
+00000000000000000604315df56e910edf0ed86fd8bbf650a2b6db18cd902f92
+0000000000000000000000000000000000000000015363b41a67d7065b4842b6
+208
 3
diff --git a/contrib/devtools/chainparams/abc/chainparams_test.txt b/contrib/devtools/chainparams/abc/chainparams_test.txt
index 2ad368157..c939f6585 100644
--- a/contrib/devtools/chainparams/abc/chainparams_test.txt
+++ b/contrib/devtools/chainparams/abc/chainparams_test.txt
@@ -1,4 +1,4 @@
-0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7
-00000000000000000000000000000000000000000000006e7adf49622960010f
+000000000027bda5ab3f9e02f3326e43d5d5276a88522381c3c114dcb2c581d7
+00000000000000000000000000000000000000000000006e7af70d7ac29ba8db
 55
 2
diff --git a/contrib/devtools/chainparams/bchn/chainparams_main.txt b/contrib/devtools/chainparams/bchn/chainparams_main.txt
index e8a4b1f5e..1d96fe7b1 100644
--- a/contrib/devtools/chainparams/bchn/chainparams_main.txt
+++ b/contrib/devtools/chainparams/bchn/chainparams_main.txt
@@ -1,4 +1,4 @@
-000000000000000000014318c77e019ba748ce39b81d6e14ce743acc76203a08
-00000000000000000000000000000000000000000153e54accb005ec4731a850
+0000000000000000010ce4db03d1d7619883d21a30f7443041cf26b3838603d2
+00000000000000000000000000000000000000000154b80e33d3a955049b20fd
 207
 3
diff --git a/contrib/devtools/chainparams/bchn/chainparams_test.txt b/contrib/devtools/chainparams/bchn/chainparams_test.txt
index 2ad368157..c939f6585 100644
--- a/contrib/devtools/chainparams/bchn/chainparams_test.txt
+++ b/contrib/devtools/chainparams/bchn/chainparams_test.txt
@@ -1,4 +1,4 @@
-0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7
-00000000000000000000000000000000000000000000006e7adf49622960010f
+000000000027bda5ab3f9e02f3326e43d5d5276a88522381c3c114dcb2c581d7
+00000000000000000000000000000000000000000000006e7af70d7ac29ba8db
 55
 2
diff --git a/src/networks/abc/chainparamsconstants.cpp b/src/networks/abc/chainparamsconstants.cpp
index 2c33e04b6..f03a4050b 100644
--- a/src/networks/abc/chainparamsconstants.cpp
+++ b/src/networks/abc/chainparamsconstants.cpp
@@ -1,18 +1,18 @@
 /**
  * @generated by contrib/devtools/chainparams/generate_chainparams_constants.py
  */
 
 #include <chainparamsconstants.h>
 
 namespace ChainParamsConstants {
-    const BlockHash MAINNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000000000d28c3b3e1bdc796d599218c3ca96d79139b154bcf6b7f86");
-    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("0000000000000000000000000000000000000000015356daa9169b9ad57e7e90");
-    const uint64_t MAINNET_ASSUMED_BLOCKCHAIN_SIZE = 207;
+    const BlockHash MAINNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000000000604315df56e910edf0ed86fd8bbf650a2b6db18cd902f92");
+    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("0000000000000000000000000000000000000000015363b41a67d7065b4842b6");
+    const uint64_t MAINNET_ASSUMED_BLOCKCHAIN_SIZE = 208;
     const uint64_t MAINNET_ASSUMED_CHAINSTATE_SIZE = 3;
 
-    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7");
-    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7adf49622960010f");
+    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("000000000027bda5ab3f9e02f3326e43d5d5276a88522381c3c114dcb2c581d7");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7af70d7ac29ba8db");
     const uint64_t TESTNET_ASSUMED_BLOCKCHAIN_SIZE = 55;
     const uint64_t TESTNET_ASSUMED_CHAINSTATE_SIZE = 2;
 } // namespace ChainParamsConstants
 
diff --git a/src/networks/bchn/chainparamsconstants.cpp b/src/networks/bchn/chainparamsconstants.cpp
index c45b0def1..3a6c86a43 100644
--- a/src/networks/bchn/chainparamsconstants.cpp
+++ b/src/networks/bchn/chainparamsconstants.cpp
@@ -1,18 +1,18 @@
 /**
  * @generated by contrib/devtools/chainparams/generate_chainparams_constants.py
  */
 
 #include <chainparamsconstants.h>
 
 namespace ChainParamsConstants {
-    const BlockHash MAINNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("000000000000000000014318c77e019ba748ce39b81d6e14ce743acc76203a08");
-    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000153e54accb005ec4731a850");
+    const BlockHash MAINNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("0000000000000000010ce4db03d1d7619883d21a30f7443041cf26b3838603d2");
+    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000154b80e33d3a955049b20fd");
     const uint64_t MAINNET_ASSUMED_BLOCKCHAIN_SIZE = 207;
     const uint64_t MAINNET_ASSUMED_CHAINSTATE_SIZE = 3;
 
-    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7");
-    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7adf49622960010f");
+    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("000000000027bda5ab3f9e02f3326e43d5d5276a88522381c3c114dcb2c581d7");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7af70d7ac29ba8db");
     const uint64_t TESTNET_ASSUMED_BLOCKCHAIN_SIZE = 55;
     const uint64_t TESTNET_ASSUMED_CHAINSTATE_SIZE = 2;
 } // namespace ChainParamsConstants