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‎doc/private_net_sync.rst‎

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11
Creating A Private Network With Two Syncing Nodes
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==================================================
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These instructions cover creating an Ethereum private network consisting of two nodes - one node will mine blocks and the other node will connect to the first node and sync the mined blocks to its own block database.
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These instructions cover creating an Ethereum private network consisting of two nodes - one node will mine blocks and the other node will connect to the first node and sync the mined blocks to its own block database. Both nodes will run a private chain configuration.
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What is a Private Network?
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What is a Private Chain?
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-------------------------
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An Ethereum chain is some state (e.g. accounts and balances and/or contract code) and a set of rules for interacting with that state. For the purposes of this documentation, a **private chain** is an Ethereum chain whose configuration is only available on your physical machine.
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An Ethereum chain is some state (e.g. accounts and balances and/or contract code) and a set of rules for interacting with that state. **Private chain** is used in this documentation to refer to an Ethereum chain whose configuration is only available on your physical machine.
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Mining
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------
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Chain Configuration
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-------------------
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- You typically initialize a private chain using a chain configuration json file (this isn't strictly required, but it makes testing a lot easier since you can do things like lower the difficulty rate and pre-fund addresses).
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- The chain configuration json file format is defined here: https://github.com/ethereum/wiki/wiki/Ethereum-Chain-Spec-Format
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- You typically initialize a private chain using a chain configuration json file (this isn't strictly required, but it makes testing easier since you can do things like lower the difficulty rate and pre-fund addresses).
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- Here's an example file:
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::
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{
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"sealEngine": "Ethash",
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"params": {
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"accountStartNonce": "0x00",
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"maximumExtraDataSize": "0x20",
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"homesteadForkBlock": "0x00",
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"EIP150ForkBlock": "0x00",
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"EIP158ForkBlock": "0x00",
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"byzantiumForkBlock": "0x00",
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"constantinopleForkBlock": "0x00",
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"constantinopleFixForkBlock": "0x00",
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"minGasLimit": "0x5208",
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"maxGasLimit": "0x7fffffffffffffff",
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"tieBreakingGas": false,
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"gasLimitBoundDivisor": "0x0400",
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"minimumDifficulty": "0x100000",
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"difficultyBoundDivisor": "0x0800",
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"durationLimit": "0x0d",
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"blockReward": "0x4563918244F40000",
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"networkID" : "0x42",
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"chainID": "0x42",
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"allowFutureBlocks" : false
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"accountStartNonce": "0x00",
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"maximumExtraDataSize": "0x20",
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"homesteadForkBlock": "0x00",
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"EIP150ForkBlock": "0x00",
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"EIP158ForkBlock": "0x00",
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"byzantiumForkBlock": "0x00",
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"constantinopleForkBlock": "0x00",
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"constantinopleFixForkBlock": "0x00",
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"minGasLimit": "0x5208",
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"maxGasLimit": "0x7fffffffffffffff",
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"tieBreakingGas": false,
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"gasLimitBoundDivisor": "0x0400",
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"minimumDifficulty": "0x100000",
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"difficultyBoundDivisor": "0x0800",
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"durationLimit": "0x0d",
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"blockReward": "0x4563918244F40000",
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"networkID" : "0x42",
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"chainID": "0x42",
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"allowFutureBlocks" : false
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},
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"genesis": {
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"nonce": "0x0000000000000042",
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"difficulty": "0x100000",
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"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
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"author": "0x0000000000000000000000000000000000000000",
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"timestamp": "0x5A5B92D7",
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"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
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"extraData": "0x655741534d2074657374206e6574776f726b2030",
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"gasLimit": "0x989680"
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"nonce": "0x0000000000000042",
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"difficulty": "0x100000",
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"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
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"author": "0x0000000000000000000000000000000000000000",
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"timestamp": "0x5A5B92D7",
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"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
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"extraData": "0x655741534d2074657374206e6574776f726b2030",
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"gasLimit": "0x989680"
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},
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"accounts": {
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"0000000000000000000000000000000000000001": { "precompiled": { "name": "ecrecover", "linear": { "base": 3000, "word": 0 } }, "balance": "0x01" },
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"0000000000000000000000000000000000000002": { "precompiled": { "name": "sha256", "linear": { "base": 60, "word": 12 } }, "balance": "0x01" },
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"0000000000000000000000000000000000000003": { "precompiled": { "name": "ripemd160", "linear": { "base": 600, "word": 120 } }, "balance": "0x01" },
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"0000000000000000000000000000000000000004": { "precompiled": { "name": "identity", "linear": { "base": 15, "word": 3 } }, "balance": "0x01" },
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"0000000000000000000000000000000000000006": { "precompiled": { "name": "alt_bn128_G1_add", "linear": { "base": 500, "word": 0 } }, "balance": "0x01" },
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}
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}
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@@ -111,28 +110,28 @@ Enter the desired password when prompted
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::
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"balance" : "2000000000000000000"
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}
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3. Start the first node:
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::
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Aleth -m on --config <file> -a <addr> --no-discovery --unsafe-transactions --listen <port>
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aleth -m on --config <file> -a <addr> --no-discovery --unsafe-transactions --listen <port>
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-m on Enable CPU mining
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--config Set chain configuration

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