[Ethereum] How to configure extraData field in genesis file

enodegenesisgo-ethereumquorum

I am in the process of setting up a private, permissioned Quorum blockchain with Istanbul consensus for simple use cases. When I specify the number of validators when generating the genesis file it works as expected.

But how can I add validators dynamically? For example I have generated genesis file with two validators and it is up and running. Now if I want to add a new node as validator how I should configure? If I use the same genesis file and added new node's enode address to permissioned-list it is connecting successfully but getting unsealed signature error. Do I need to modify the genesis file extraHash field for new nodes?

Best Answer

Please read this article: https://github.com/ethereum/EIPs/issues/650, it should address all of the questions you pose.

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[Ethereum] Clique: Genesis File

Use something like this:

{
    "config": {
        "chainId": <yourChainId>,
        "homesteadBlock": 0,
        "eip150Block": 0,
        "eip155Block": 0,
        "eip158Block": 0,
        "byzantiumBlock": 0,
        "clique": {
            "period": <yourPeriodInSecs>,
            "epoch": <yourEpochInBlocks>
        }
    },
    "alloc": {
        "0000000000000000000000000000000000000001": { "balance": "1" },
        "0000000000000000000000000000000000000002": { "balance": "1" },
        "0000000000000000000000000000000000000003": { "balance": "1" },
        "0000000000000000000000000000000000000004": { "balance": "1" },
        "0000000000000000000000000000000000000005": { "balance": "1" },
        "0000000000000000000000000000000000000006": { "balance": "1" },
        "0000000000000000000000000000000000000007": { "balance": "1" },
        "0000000000000000000000000000000000000008": { "balance": "1" },
        "<yourPreallocAccount>": { "balance": "<yourPreallocAmount>" }
    },
    "coinbase": "0x0000000000000000000000000000000000000000",
    "difficulty": "1",
    "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000<yourInitialSigners>0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "gasLimit": "<yourInitialGasLimit>",
    "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "nonce": "0",
    "timestamp": "<yourUnixTimeStamp>"
}

yourChainId: Just use a number.
yourPeriodInSecs: Block time in seconds. 5 or 10 are good values to start with.
yourEpochInBlocks: The default of 30000 is usually good enough.
yourPreallocAccount, yourPreallocAmount: Since no coins are created through mining, the preallocated amounts are all you have. Give an account some coins here. (No prefixed "0x".)
yourInitialSigners: You need at least one initial signer. Add its account address here.
yourInitialGasLimit: The initial gas limit per block. Depends on what you want to do. (Consider 21000 gas/transfer, for example.)
yourUnixTimeStamp: The number of seconds since the Unix epoch (1970-01-01).

Notes:

The other elements in config are optional; the way they are set here get you a blockchain that works like the current Ethereum (except for Clique). They control the blockchain behavior. You'll find more about what they mean by searching for them.
The other accounts in alloc are predefined contracts that get initialized by this. Not strictly necessary but recommended.
AFAIK, all the other genesis block elements must be like they are here.

Best Answer

Related Solutions

[Ethereum] Clique: Genesis File

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