For actually testing the process flow, generate the `chainparams_*.txt` files:
```
bitcoind
make_chainparams.py > chainparams_main.txt
bitcoind --testnet
make_chainparams.py -a 127.0.0.1:18332 > chainparams_main.txt
```
For this diff, I did not do the above, I copied the existing chainparams manually into the `chainparams_*.txt` files so that we don't add updating those to the review process of this diff.
After the `chainparams_*.txt` files are ready, do the following:
```
generate_chainparams_constants.py .
make check
ninja check
```
TeamCity IBD