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An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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73 lines
2.9 KiB
73 lines
2.9 KiB
6 years ago
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description: Configuration items specified in the genesis file
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# Configuration Items
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Network configuration items are specified in the genesis file.
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| Item | Description |
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|---------------------|-:----------------------------------------------------------------------------------------------------------------------------------------|
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| Chain ID | [Chain ID for the network](NetworkID-And-ChainID.md) |
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| Milestone blocks | [Milestone blocks for the network](#milestone-blocks) |
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| `ethash` | Specifies network uses [Ethash](../Consensus-Protocols/Overview-Consensus.md) and contains [`fixeddifficulty`](#Fixed Difficulty) |
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| `clique` | Specifies network uses [Clique](../Consensus-Protocols/Clique.md) and contains [Clique configuration items](../Consensus-Protocols/Clique.md#genesis-file) |
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| `ibft2` | Specifies network uses [IBFT 2.0](../Consensus-Protocols/IBFT.md) and contains [IBFT 2.0 configuration items](../Consensus-Protocols/IBFT.md#genesis-file) |
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| `contractSizeLimit` | Maximum contract size in bytes. Specify in [free gas networks](FreeGas.md). Default is `24576` and the maximum size is `2147483647`. |
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| `evmStackSize` | Maximum stack size. Specify to increase the maximum stack size in private networks with very complex smart contracts. Default is `1024`. |
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## Milestone Blocks
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In public networks, the milestone blocks specify the blocks at which the network changed protocol.
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!!! example "Ethereum Mainnet Milestone Blocks"
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```json
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{
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"config": {
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...
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"homesteadBlock": 1150000,
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"daoForkBlock": 1920000,
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"daoForkSupport": true,
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"eip150Block": 2463000,
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"eip150Hash": "0x2086799aeebeae135c246c65021c82b4e15a2c451340993aacfd2751886514f0",
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"eip155Block": 2675000,
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"eip158Block": 2675000,
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"byzantiumBlock": 4370000,
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"constantinopleBlock": 7280000,
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"constantinopleFixBlock": 7280000,
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...
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},
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}
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```
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In private networks, the milestone block defines the protocol version for the network.
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!!! example "Private Network Milestone Block"
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```json
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{
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"config": {
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...
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"constantinopleFixBlock": 0,
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...
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},
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}
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```
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## Fixed Difficulty
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Use `fixeddifficulty` to specify a fixed difficulty in private networks using Ethash.
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!!! example
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```json
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{
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"config": {
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...
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"ethash": {
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"fixeddifficulty": 1000
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},
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},
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...
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}
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```
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