# Genesis Block

The genesis block information of the mainnet and testnet is hard-coded in the underlying code, and the genesis block file is as follows. 

\*In order to maintain the consistency of system contracts, the code of the system contract address is hard-coded and not presented in the genesis block file.

## Definition

* Blockchain Identification: `chainId`
* Hard folk configuration: `homesteadBlock`, `eip150Block`, `eip150Hash`, `eip155Block`, `eip158Block`, `byzantiumBlock`, `constantinopleBlock`, `petersburgBlock`, `istanbulBlock`, `muirGlacierBlock` 
* Consensus parameter configuration: `dpos`
  * `period` : block interval
  * `epoch` Total blocks in an epoch
* Genesis Block Basic Information: `number`, `gasUsed`, `parentHash`, `nonce` , `timestamp` ,  `gasLimit`, `difficulty`
* `extraData` : Setup the initial validator node
* `alloc` Setup the initial account information

## Mainnet

```json
{
    "config": {
        "chainId": 36,
        "homesteadBlock": 0,
        "eip150Block": 0,
        "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "eip155Block": 0,
        "eip158Block": 0,
        "byzantiumBlock": 0,
        "constantinopleBlock": 0,
        "petersburgBlock": 0,
        "istanbulBlock": 0,
        "muirGlacierBlock": 0,
        "dpos": {
            "period": 6,
            "epoch": 14400
        }
    },
    "nonce": "0x0",
    "timestamp": "0x6303a7c2",
    "extraData": "0x000000000000000000000000000000000000000000000000000000000000000063937F2Ff3c2CEAebD99d210d6368fDe8CfDBC490000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "gasLimit": "0x280de80",
    "difficulty": "0x1",
    "alloc": {
      "0xF28e4120bFF3b046D7CA5fB4f9415c1e0994b996": {
        "balance": "0xba4c9abddef64d2556200000"
      },
      "0x63937F2Ff3c2CEAebD99d210d6368fDe8CfDBC49": {
        "balance": "0x2116546630bbd4cf640000"
      }
    },
    "number": "0x0",
    "gasUsed": "0x0",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
}
```

## Testnet

```json
{
    "config": {
        "chainId": 72,
        "homesteadBlock": 0,
        "eip150Block": 0,
        "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "eip155Block": 0,
        "eip158Block": 0,
        "byzantiumBlock": 0,
        "constantinopleBlock": 0,
        "petersburgBlock": 0,
        "istanbulBlock": 0,
        "muirGlacierBlock": 0,
        "dpos": {
            "period": 3,
            "epoch": 28800
        }
    },
    "nonce": "0x0",
    "timestamp": "0x626791d2",
    "extraData": "0x00000000000000000000000000000000000000000000000000000000000000006885Cf202Ea39F246dc4c93bf35BbF180A82FABD0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "gasLimit": "0x280de80",
    "difficulty": "0x1",
    "alloc": {
        "0xa88548e97af8809afac9dc7a930650c117951059": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x6b246a131e2c59108C841E9bc725aCad3d3Ee3f0": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x5C5c810e02ac5c0bCf0a733027780D5Eb5BBc195": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x61b60e805859783c4AE1B5c7BA6A77d8933c125b": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xC1C2F2eA8052718960B28959471039C8B90Bb34F": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x513A32afC0De7eE89CE8Dc8320B1F4535b539387": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xd3b6db2e2FC16cB939CB174109c8ACB060F90A6D": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xd7a53C68ad615906484A17feD3ebe298Ad389fEC": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xC737Aaaa44399a32ba7e18222aE38A9609085142": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x839966B579dDcac9780314C4d8A17e5d845a632C": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x66dC74cBc72580f79bD558a98935c38ce304E92f": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xe560A742caFfF57e4da0f37760faDC555b216fA0": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x4567be005f55a7db76eb3be16bba497f60575df3": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xeebc0ca41bb466f9605af5eec121c64a2162379a": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xb60ffd1a460f31069fb1b196f562a4568a9b5528": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0xe3f3f71a8c83573ce1788945782abe95d79a0e2c": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x4ba2e9340010d0ae2dcdbcfb24dc40e62ab8f725": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        },
        "0x6885Cf202Ea39F246dc4c93bf35BbF180A82FABD": {
            "balance": "0x50c783eb9b5c85f2a80000000"
        }
    },
    "number": "0x0",
    "gasUsed": "0x0",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
}
```


---

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