# Private Chain Construction

## Prepare validator account(s) <a href="#prepare-validator-accounts" id="prepare-validator-accounts"></a>

According to the number of miner nodes, prepare corresponding validator account(s).

You can create a new account by the command `geth account new`, and then put the password to a text file. For example:

```
./geth account new --datadir data
echo {your-password} > password.txt
```

After creating an account, you may see the address of the new account.

Or you can also looking to the `UTC-**`file under the `data/keystore` path to find it, e.g.:

> 8cc5a1a0802db41db826c2fcb72423744338dcb0

## genesis.json configuration <a href="#genesisjson-configuration" id="genesisjson-configuration"></a>

```
{
  "config": {
    "chainId": 123, 
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "muirGlacierBlock": 0,
    //consensus
    "congress": { 
      "period": 5,  
      "epoch": 100
    }
  },
  "nonce": "0x0",
  "timestamp": "0x5f714b2f",
  //config inital validator
  "extraData": "0x00000000000000000000000000000000000000000000000000000000000000008cc5a1a0802db41db826c2fcb72423744338dcb00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "gasLimit": "0x1C9C380",
  "difficulty": "0x1",
  "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "coinbase": "0x0000000000000000000000000000000000000000",
  "number": "0x0",
  "gasUsed": "0x0",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
  "alloc": {
    //Pre-allocated balance
    "6301cdf018E8678067cf8f14aB99F6f2a906dB44": {
      "balance": "0x1000000000000"
    },
    //set system contract
    "000000000000000000000000000000000000F000": {
      "balance":"0x0",
      "code": "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    }
  }
}
```

* `congress` Consensus-related parameters.
* `period` Block interval time.
* `extraData` Use to set inital validators. Replace `8cc5a1a0802db41db826c2fcb72423744338dcb0` with your own address. If you want multiple validators, you can replace with stitching them together.
* `alloc` `000000000000000000000000000000000000f000` `000000000000000000000000000000000000f001` `000000000000000000000000000000000000f002` are system contracts. If you wish to compile it yourself, you can configure `deployedBytecode` to the `code` field after compilation.

## Create genesis block <a href="#create-genesis-block" id="create-genesis-block"></a>

After generating the `genesis.json` file, execute the following command to generate the genesis block.

> geth init genesis.json

## Multiple Node

Use the same `genesis.json` file for initializing the node. Then go to the node command line with the `geth attach` command. View the node information via `admin.nodeInfo`. Then add the node on other machines with `addmin.addPeer.`

{% hint style="info" %}
Note: should first put the Linux-amd64 version of `geth` under the `multi` directory.
{% endhint %}
