diff --git a/contrib/devtools/chainparams/abc/chainparams_main.txt b/contrib/devtools/chainparams/abc/chainparams_main.txt
index 879375fb9..d80480cfb 100644
--- a/contrib/devtools/chainparams/abc/chainparams_main.txt
+++ b/contrib/devtools/chainparams/abc/chainparams_main.txt
@@ -1,4 +1,4 @@
-0000000000000000007a99bcce8386923dd2ef62b86e827bde426af7cd772b9c
-00000000000000000000000000000000000000000152eb12743403ccefe4b784
+00000000000000000d28c3b3e1bdc796d599218c3ca96d79139b154bcf6b7f86
+0000000000000000000000000000000000000000015356daa9169b9ad57e7e90
 207
 3
diff --git a/contrib/devtools/chainparams/abc/chainparams_test.txt b/contrib/devtools/chainparams/abc/chainparams_test.txt
index 1f02f5fe1..2ad368157 100644
--- a/contrib/devtools/chainparams/abc/chainparams_test.txt
+++ b/contrib/devtools/chainparams/abc/chainparams_test.txt
@@ -1,4 +1,4 @@
-00000000000192e42a0dd8eb129d29e132b02e55017a52111b1d32a2ab1e2862
-00000000000000000000000000000000000000000000006e6b6dea215d3dba09
+0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7
+00000000000000000000000000000000000000000000006e7adf49622960010f
 55
 2
diff --git a/contrib/devtools/chainparams/bchn/chainparams_main.txt b/contrib/devtools/chainparams/bchn/chainparams_main.txt
index 879375fb9..e8a4b1f5e 100644
--- a/contrib/devtools/chainparams/bchn/chainparams_main.txt
+++ b/contrib/devtools/chainparams/bchn/chainparams_main.txt
@@ -1,4 +1,4 @@
-0000000000000000007a99bcce8386923dd2ef62b86e827bde426af7cd772b9c
-00000000000000000000000000000000000000000152eb12743403ccefe4b784
+000000000000000000014318c77e019ba748ce39b81d6e14ce743acc76203a08
+00000000000000000000000000000000000000000153e54accb005ec4731a850
 207
 3
diff --git a/contrib/devtools/chainparams/bchn/chainparams_test.txt b/contrib/devtools/chainparams/bchn/chainparams_test.txt
index 1f02f5fe1..2ad368157 100644
--- a/contrib/devtools/chainparams/bchn/chainparams_test.txt
+++ b/contrib/devtools/chainparams/bchn/chainparams_test.txt
@@ -1,4 +1,4 @@
-00000000000192e42a0dd8eb129d29e132b02e55017a52111b1d32a2ab1e2862
-00000000000000000000000000000000000000000000006e6b6dea215d3dba09
+0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7
+00000000000000000000000000000000000000000000006e7adf49622960010f
 55
 2
diff --git a/src/networks/abc/chainparamsconstants.cpp b/src/networks/abc/chainparamsconstants.cpp
index 956d15e65..2c33e04b6 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("0000000000000000007a99bcce8386923dd2ef62b86e827bde426af7cd772b9c");
-    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000152eb12743403ccefe4b784");
+    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 uint64_t MAINNET_ASSUMED_CHAINSTATE_SIZE = 3;
 
-    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000192e42a0dd8eb129d29e132b02e55017a52111b1d32a2ab1e2862");
-    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e6b6dea215d3dba09");
+    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7adf49622960010f");
     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 956d15e65..c45b0def1 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("0000000000000000007a99bcce8386923dd2ef62b86e827bde426af7cd772b9c");
-    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000152eb12743403ccefe4b784");
+    const BlockHash MAINNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("000000000000000000014318c77e019ba748ce39b81d6e14ce743acc76203a08");
+    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000153e54accb005ec4731a850");
     const uint64_t MAINNET_ASSUMED_BLOCKCHAIN_SIZE = 207;
     const uint64_t MAINNET_ASSUMED_CHAINSTATE_SIZE = 3;
 
-    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000192e42a0dd8eb129d29e132b02e55017a52111b1d32a2ab1e2862");
-    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e6b6dea215d3dba09");
+    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("0000000003b6973508fabca990eae41f389af0f5d4834fef3d4bd0461f75c9d7");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7adf49622960010f");
     const uint64_t TESTNET_ASSUMED_BLOCKCHAIN_SIZE = 55;
     const uint64_t TESTNET_ASSUMED_CHAINSTATE_SIZE = 2;
 } // namespace ChainParamsConstants