# Configuration¶

## MainnetChainId and MainnetNetworkId¶

All general configuration have been curated in configs/general.go. Two notable parameters are MainnetChainId and MainnetNetworkId.

The code below are cited from general.go. As we can see MainnetChainId is set to 42, while MainnetNetworkId is 0.

const (
DevChainId     = 41
MainnetChainId = 42
TestnetChainId = 43
)

const (
MainnetNetworkId = 0
DevNetworkId     = 1
TestnetNetworkId = 2
)


These two parameters are the marks of Mainnet. If either of them is not as default setting, the chain does not sync with Mainnet. Any message from a node with different setting is regarded as useless information.

In addition, it is possible to start a private chain with its own network ID and chain ID. But it requires more settings like IP addresses for validators.

## Configure a Private Network¶

Modify genesis.toml in the directory examples/cpchain/conf-dev to configure your own private network.

timestamp = 1492009146
#extraData = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
gasLimit = 47000000
difficulty = 1
coinbase = "0x0000000000000000000000000000000000000000"
number = 0
gasUsed = 0
parentHash = "0x0000000000000000000000000000000000000000000000000000000000000000"

[config]
chainId = 41

[config.dpor]
period = 200_000_000
#period = 500_000_000
#period = 1_000_000_000
termLen = 4
viewLen = 3
validatorsLen = 4
maxInitBlockNumber = 120
proxyContractRegister = "0x1a9fae75908752d0abf4dca45ebcac311c376290"
impeachTimeout = 2000000000

[config.dpor.contracts]
campaign = "0x0ddf4057eedfb80d58029be49bab09bbc45bc500"
pdash = "0xaaae743244a7a5116470df8bd398e7d562ae8881"
proposer = "0x310236762f36bf0f69f792bd9fb08b5c679aa3f1"
register = "0x019cc04ff9d88529b9e58ff26bfc53bce060e915"
rpt = "0x82104907aa699b2982fc46f38fd8c915d03cdb8d"

[alloc.0x0000000000000000000000000000000000000000]
balance = "0x0"

[alloc.0x0000000000000000000000000000000000000001]
balance = "0x0"

[alloc.0x0000000000000000000000000000000000000002]
balance = "0x0"

[alloc.0x00000000000000000000000000000000000000ff]
balance = "0x0"

[alloc.0x22a672eab2b1a3ff3ed91563205a56ca5a560e08]
balance = "0x7fffffffffffffff"

[alloc.0x3a18598184ef84198db90c28fdfdfdf56544f747]
balance = "0x7fffffffffffffff"

[alloc.0x6e31e5b68a98dcd17264bd1ba547d0b3e874da1e]
balance = "0x7fffffffffffffff"

[alloc.0xc05302acebd0730e3a18a058d7d1cb1204c4a092]
balance = "0x7fffffffffffffff"

balance = "0x7fffffffffffffff"

[alloc.0xef3dd127de235f15ffb4fc0d71469d1339df6465]
balance = "0x7fffffffffffffff"

[dpor]
#seal = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
#sigs = [[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]]
proposers = ["0xc05302acebd0730e3a18a058d7d1cb1204c4a092", "0xe94b7b6c5a0e526a4d97f9768ad6097bde25c62a", "0xef3dd127de235f15ffb4fc0d71469d1339df6465", "0x6e31e5b68a98dcd17264bd1ba547d0b3e874da1e"]
validators = ["0x7b2f052a372951d02798853e39ee56c895109992", "0x2f0176cc3a8617b6ddea6a501028fa4c6fc25ca1", "0xe4d51117832e84f1d082e9fc12439b771a57e7b2", "0x32bd7c33bb5060a85f361caf20c0bda9075c5d51"]


Initialize CPChain after modifying the configuration file, then run a private chain.

$./cpchain-init.sh$ ./cpchain-all.sh