diff --git a/contrib/devtools/chainparams/chainparams_main.txt b/contrib/devtools/chainparams/chainparams_main.txt
new file mode 100644
--- /dev/null
+++ b/contrib/devtools/chainparams/chainparams_main.txt
@@ -0,0 +1,2 @@
+000000000000000002be7b5e999ab5d40b8cbcbabd0f288695881da496eb65a2
+000000000000000000000000000000000000000000fd614ab0f9f59277fe2975
diff --git a/contrib/devtools/chainparams/chainparams_test.txt b/contrib/devtools/chainparams/chainparams_test.txt
new file mode 100644
--- /dev/null
+++ b/contrib/devtools/chainparams/chainparams_test.txt
@@ -0,0 +1,2 @@
+00000000fbabb53ec6eddb3d56d3262f30dbb6549b391255090d351eccd01c24
+0000000000000000000000000000000000000000000000512031dc9900995ec4
diff --git a/contrib/devtools/chainparams/generate_chainparams_constants.py b/contrib/devtools/chainparams/generate_chainparams_constants.py
new file mode 100755
--- /dev/null
+++ b/contrib/devtools/chainparams/generate_chainparams_constants.py
@@ -0,0 +1,72 @@
+#!/usr/bin/env python3
+# Copyright (c) 2019 The Bitcoin developers
+# Distributed under the MIT software license, see the accompanying
+# file COPYING or http://www.opensource.org/licenses/mit-license.php.
+'''
+Script to generate list of chainparams constants (ie. assumevalid and
+minimum chainwork).
+
+This script expects a text file for each chain in the directory that is passed
+as an argument:
+
+    chainparams_main.txt
+    chainparams_test.txt
+
+These files must consist of lines in the format
+
+    <assumevalid hash>
+    <minimum chainwork>
+
+The outputted constants should be pasted into `src/chainparamsconstants.h`.
+'''
+
+import sys
+import os
+
+
+def process_constants(indir, file_name):
+    with open(os.path.join(indir, file_name), 'r', encoding="utf8") as f:
+        constants = f.readlines()
+
+    # Ensure only two lines are read from the file.
+    assert(len(constants) == 2)
+
+    return [line.rstrip() for line in constants]
+
+
+def main():
+    if len(sys.argv) != 2:
+        print('Usage: {} <dir_with_chainparams_txt>'.format(sys.argv[0]), file=sys.stderr)
+        sys.exit(1)
+
+    indir = sys.argv[1]
+
+    print('''\
+#ifndef BITCOIN_CHAINPARAMSCONSTANTS_H
+#define BITCOIN_CHAINPARAMSCONSTANTS_H
+/**
+ * Chain params constants for each tracked chain.
+ * @{} by contrib/devtools/chainparams/generate_chainparams_constants.py
+ */
+
+#include <uint256.h>
+
+namespace ChainParamsConstants {{
+    const uint256 MAINNET_DEFAULT_ASSUME_VALID = uint256S("{}");
+    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("{}");
+
+    const uint256 TESTNET_DEFAULT_ASSUME_VALID = uint256S("{}");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("{}");
+}} // namespace ChainParamsConstants
+
+#endif // BITCOIN_CHAINPARAMSCONSTANTS_H\
+'''.format(
+        # 'generated' is split out so this file is not identified as generated.
+        "generated",
+        *process_constants(indir, 'chainparams_main.txt'),
+        *process_constants(indir, 'chainparams_test.txt'))
+    )
+
+
+if __name__ == '__main__':
+    main()
diff --git a/src/Makefile.am b/src/Makefile.am
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -118,6 +118,7 @@
   chain.h \
   chainparams.h \
   chainparamsbase.h \
+  chainparamsconstants.h \
   chainparamsseeds.h \
   checkpoints.h \
   checkqueue.h \
diff --git a/src/chainparams.cpp b/src/chainparams.cpp
--- a/src/chainparams.cpp
+++ b/src/chainparams.cpp
@@ -6,6 +6,7 @@
 
 #include <chainparams.h>
 
+#include <chainparamsconstants.h>
 #include <chainparamsseeds.h>
 #include <consensus/merkle.h>
 #include <tinyformat.h>
@@ -104,13 +105,13 @@
         consensus.fPowNoRetargeting = false;
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S(
-            "000000000000000000000000000000000000000000fd614ab0f9f59277fe2975");
+        consensus.nMinimumChainWork =
+            ChainParamsConstants::MAINNET_MINIMUM_CHAIN_WORK;
 
         // By default assume that the signatures in ancestors of this block are
         // valid.
-        consensus.defaultAssumeValid = uint256S(
-            "000000000000000002be7b5e999ab5d40b8cbcbabd0f288695881da496eb65a2");
+        consensus.defaultAssumeValid =
+            ChainParamsConstants::MAINNET_DEFAULT_ASSUME_VALID;
 
         // August 1, 2017 hard fork
         consensus.uahfHeight = 478558;
@@ -272,13 +273,13 @@
         consensus.fPowNoRetargeting = false;
 
         // The best chain should have at least this much work.
-        consensus.nMinimumChainWork = uint256S(
-            "0000000000000000000000000000000000000000000000512031dc9900995ec4");
+        consensus.nMinimumChainWork =
+            ChainParamsConstants::TESTNET_MINIMUM_CHAIN_WORK;
 
         // By default assume that the signatures in ancestors of this block are
         // valid.
-        consensus.defaultAssumeValid = uint256S(
-            "00000000fbabb53ec6eddb3d56d3262f30dbb6549b391255090d351eccd01c24");
+        consensus.defaultAssumeValid =
+            ChainParamsConstants::TESTNET_DEFAULT_ASSUME_VALID;
 
         // August 1, 2017 hard fork
         consensus.uahfHeight = 1155875;
diff --git a/src/chainparamsconstants.h b/src/chainparamsconstants.h
new file mode 100644
--- /dev/null
+++ b/src/chainparamsconstants.h
@@ -0,0 +1,18 @@
+#ifndef BITCOIN_CHAINPARAMSCONSTANTS_H
+#define BITCOIN_CHAINPARAMSCONSTANTS_H
+/**
+ * Chain params constants for each tracked chain.
+ * @generated by contrib/devtools/chainparams/generate_chainparams_constants.py
+ */
+
+#include <uint256.h>
+
+namespace ChainParamsConstants {
+    const uint256 MAINNET_DEFAULT_ASSUME_VALID = uint256S("000000000000000002be7b5e999ab5d40b8cbcbabd0f288695881da496eb65a2");
+    const uint256 MAINNET_MINIMUM_CHAIN_WORK = uint256S("000000000000000000000000000000000000000000fd614ab0f9f59277fe2975");
+
+    const uint256 TESTNET_DEFAULT_ASSUME_VALID = uint256S("00000000fbabb53ec6eddb3d56d3262f30dbb6549b391255090d351eccd01c24");
+    const uint256 TESTNET_MINIMUM_CHAIN_WORK = uint256S("0000000000000000000000000000000000000000000000512031dc9900995ec4");
+} // namespace ChainParamsConstants
+
+#endif // BITCOIN_CHAINPARAMSCONSTANTS_H