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OZ Create2.md

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163 - OZ Create2

OpenZeppelin Create2: makes usage of the CREATE2 EVM opcode easier and safer.

CREATE2 can be used to compute in advance the address where a smart contract will be deployed, which allows for interesting new mechanisms known as 'counterfactual interactions’. 

  1. deploy(uint256 amount, bytes32 salt, bytes bytecode) → address: Deploys a contract using CREATE2. The address where the contract will be deployed can be known in advance via computeAddress. The bytecode for a contract can be obtained from Solidity with type(contractName).creationCode. Requirements:

    1. bytecode must not be empty.
    2. salt must have not been used for bytecode already.
    3. the factory must have a balance of at least amount.
    4. if amount is non-zero, bytecode must have a payable constructor.

  2. computeAddress(bytes32 salt, bytes32 bytecodeHash) → address: Returns the address where a contract will be stored if deployed via deploy. Any change in the bytecodeHash or salt will result in a new destination address.

  3. computeAddress(bytes32 salt, bytes32 bytecodeHash, address deployer) → address: Returns the address where a contract will be stored if deployed via deploy from a contract located at deployer. If the deployer is this contract’s address, it returns the same value as computeAddress.

Slide Screenshot

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Slide Text

  • CREATE2 EVM Opcode
    • Easier & Safer
  • deploy(uint256 amount, bytes32 salt, bytes bytecode)
  • computeAddress(bytes32 salt, a bytecodeHash)
  • computeAddress(bytes32 salt, bytes32 bytecodeHash, address deployer) -> address

References

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