diff --git a/contrib/devtools/chainparams/abc/chainparams_main.txt b/contrib/devtools/chainparams/abc/chainparams_main.txt
index 3455c2062..b2a02d7d8 100644
--- a/contrib/devtools/chainparams/abc/chainparams_main.txt
+++ b/contrib/devtools/chainparams/abc/chainparams_main.txt
@@ -1,4 +1,4 @@
-00000000000000000823f7172d4fdd74457434e721ee798fcbd15d19a0c088e7
-0000000000000000000000000000000000000000015377edc8d668e58b0dc2c5
+00000000000000000bbf74c9cbc94a1b2efd539b191be565961c7867a3672101
+00000000000000000000000000000000000000000153873c309a54a154807f7b
 209
 3
diff --git a/contrib/devtools/chainparams/abc/chainparams_test.txt b/contrib/devtools/chainparams/abc/chainparams_test.txt
index e625a466c..2721b4dc8 100644
--- a/contrib/devtools/chainparams/abc/chainparams_test.txt
+++ b/contrib/devtools/chainparams/abc/chainparams_test.txt
@@ -1,4 +1,4 @@
-00000000002834e464c106c67bd88729850cdfe25b37d562a21b05d769e0393b
-00000000000000000000000000000000000000000000006e7d3307aac824d6f2
+00000000000922af6e587f3cddd4a3d715e046563935d85a2b5b6bfcd1c25ef7
+00000000000000000000000000000000000000000000006e7d5c32f4d4fec4f8
 55
 2
diff --git a/contrib/devtools/chainparams/bchn/chainparams_main.txt b/contrib/devtools/chainparams/bchn/chainparams_main.txt
index 7ed14f814..e662e58d6 100644
--- a/contrib/devtools/chainparams/bchn/chainparams_main.txt
+++ b/contrib/devtools/chainparams/bchn/chainparams_main.txt
@@ -1,4 +1,4 @@
-000000000000000003230276d61bcb89b37d152449b3031f27b4a6ec40a33269
-000000000000000000000000000000000000000001568e2a4dee7ff865c05cce
+00000000000000000386c48790bb079b739646e89d022f70b0fdc544d697bdb5
+000000000000000000000000000000000000000001577689a4b54eeff4367e61
 208
 3
diff --git a/contrib/devtools/chainparams/bchn/chainparams_test.txt b/contrib/devtools/chainparams/bchn/chainparams_test.txt
index e625a466c..2721b4dc8 100644
--- a/contrib/devtools/chainparams/bchn/chainparams_test.txt
+++ b/contrib/devtools/chainparams/bchn/chainparams_test.txt
@@ -1,4 +1,4 @@
-00000000002834e464c106c67bd88729850cdfe25b37d562a21b05d769e0393b
-00000000000000000000000000000000000000000000006e7d3307aac824d6f2
+00000000000922af6e587f3cddd4a3d715e046563935d85a2b5b6bfcd1c25ef7
+00000000000000000000000000000000000000000000006e7d5c32f4d4fec4f8
 55
 2
diff --git a/src/networks/abc/chainparamsconstants.cpp b/src/networks/abc/chainparamsconstants.cpp
index 0060a3055..f6bdcb1f9 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("00000000000000000823f7172d4fdd74457434e721ee798fcbd15d19a0c088e7");
-    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("0000000000000000000000000000000000000000015377edc8d668e58b0dc2c5");
+    const BlockHash MAINNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000000000bbf74c9cbc94a1b2efd539b191be565961c7867a3672101");
+    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000153873c309a54a154807f7b");
     const uint64_t MAINNET_ASSUMED_BLOCKCHAIN_SIZE = 209;
     const uint64_t MAINNET_ASSUMED_CHAINSTATE_SIZE = 3;
 
-    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000002834e464c106c67bd88729850cdfe25b37d562a21b05d769e0393b");
-    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7d3307aac824d6f2");
+    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000922af6e587f3cddd4a3d715e046563935d85a2b5b6bfcd1c25ef7");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7d5c32f4d4fec4f8");
     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 5a438aa1b..887d7de3c 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("000000000000000003230276d61bcb89b37d152449b3031f27b4a6ec40a33269");
-    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("000000000000000000000000000000000000000001568e2a4dee7ff865c05cce");
+    const BlockHash MAINNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000000000386c48790bb079b739646e89d022f70b0fdc544d697bdb5");
+    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("000000000000000000000000000000000000000001577689a4b54eeff4367e61");
     const uint64_t MAINNET_ASSUMED_BLOCKCHAIN_SIZE = 208;
     const uint64_t MAINNET_ASSUMED_CHAINSTATE_SIZE = 3;
 
-    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000002834e464c106c67bd88729850cdfe25b37d562a21b05d769e0393b");
-    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7d3307aac824d6f2");
+    const BlockHash TESTNET_DEFAULT_ASSUME_VALID = BlockHash::fromHex("00000000000922af6e587f3cddd4a3d715e046563935d85a2b5b6bfcd1c25ef7");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("00000000000000000000000000000000000000000000006e7d5c32f4d4fec4f8");
     const uint64_t TESTNET_ASSUMED_BLOCKCHAIN_SIZE = 55;
     const uint64_t TESTNET_ASSUMED_CHAINSTATE_SIZE = 2;
 } // namespace ChainParamsConstants