An enterprise-grade Java-based, Apache 2.0 licensed Ethereum client https://wiki.hyperledger.org/display/besu
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besu/docs/Configuring-Pantheon/Contracts-in-Genesis.md

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description: Pre-deploying contracts in genesis file
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# Predeploying Contracts in the Genesis File
To predeploy contracts when starting Pantheon, specify contract code in the genesis file.
!!! example "Contract Code in Genesis File"
```json
{
...
"alloc": {
"0x0ffd23af8eebc60b3cfdeed6f814988757237314": {
"balance": "0x100000000000000000000000000000000000000000000000000",
"code": "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",
"storage": {
"7aa07e0c924147697605046b7c2c32645b7bbfb41e0ac5d0a84ac93cbb759798": "0000000000000000000000000000000000000000000000000000000000000001",
"cea2b0602db61f92b76ec4402875cc38eedc9fc425cb1b697fc2265d50fc20fb": "0000000000000000000000000000000000000000000000000000000000000001",
}
}
},
...
}
```
The contract code in the genesis file defines:
* Address
* Balance
* Bytecode
* Key value pairs for contract storage.