Differential D4157 Diff 13173 contrib/devtools/chainparams/README.md

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				# Chainparams Constants

				Utilities to generate chainparams constants that are compiled into the client
				(see [src/chainparamsconstants.h](/src/chainparamsconstants.h).

				The chainparams constants are fetched from bitcoind, dumped to intermediate
				files, and then compiled into [src/chainparamsconstants.h](/src/chainparamsconstants.h).
				If you're running bitcoind locally, the following instructions will work
				out-of-the-box:

				## Mainnet
				```
				bitcoind
				make_chainparams > chainparams_main.txt
				```

				## Testnet
				```
				bitcoind --testnet
				make_chainparams --testnet -a 127.0.0.1:18332 > chainparams_test.txt
				```

				## Build C++ Header File
				```
				generate_chainparams_constants.py . > ../../../src/chainparamsconstants.h
				```

				## Testing

				Updating these constants should be reviewed carefully, with a
				reindex-chainstate, checkpoints=0, and assumevalid=0 to catch any defect that
				causes rejection of blocks in the past history.