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 +1,59 @@
+#!/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(output, f, chainName):
+    output.write('    static const uint256 {}_DEFAULT_ASSUME_VALID = uint256S("{}");\n'.format(chainName, f.readline()))
+    output.write('    static const uint256 {}_MINIMUM_CHAIN_WORK = uint256S("{}");\n'.format(chainName, f.readline))
+
+
+def main():
+    if len(sys.argv) != 2:
+        print('Usage: {} <path_to_chainparams_txt>'.format(sys.argv[0]), file=sys.stderr)
+        sys.exit(1)
+    output = sys.stdout
+    indir = sys.argv[1]
+    output.write('#ifndef BITCOIN_CHAINPARAMSCONSTANTS_H\n')
+    output.write('#define BITCOIN_CHAINPARAMSCONSTANTS_H\n')
+    output.write('/**\n')
+    output.write(' * Chain params constants for each tracked chain.\n')
+    output.write(' * @generated by contrib/devtools/chainparams/generate_chainparams_constants.py\n')
+    output.write(' */\n')
+    output.write('\n')
+    output.write('#include <uint256.h>\n')
+    output.write('\n')
+    output.write('namespace ChainParamsConstants {\n')
+    with open(os.path.join(indir, 'chainparams_main.txt'), 'r', encoding="utf8") as f:
+        process_constants(output, f, 'MAINNET')
+    output.write('\n')
+    with open(os.path.join(indir, 'chainparams_test.txt'), 'r', encoding="utf8") as f:
+        process_constants(output, f, 'TESTNET')
+    output.write('}\n')
+    output.write('\n')
+    output.write('#endif // BITCOIN_CHAINPARAMSCONSTANTS_H\n')
+
+
+if __name__ == '__main__':
+    main()