In this repo, we show how to deploy a metamorphic contract.
We use the work of 0age as a foundation:
- His medium post on this
- His Github repo with the factory code
- Example: The mainnet Metamorphic factory contract
In brief: We deploy a first contract via the metamorphic proxy pattern, then destroy it (via selfdestruct), and then deploy a different contract (meaning: with a different code hash) to the same address as previously occupied by the first contract. Then we check against the Rareskills.io challenge.
The solution is outlined in scripts/deploy.js where we deploy the Metamorphic factory contract followed by the contracts to be deployed with differing code hashes but we deploy to the same address.
Rareskills's challenge is in the code contracts/StrangeV4.sol.
First, compile:
> npx hardhat compile
Compiled 5 Solidity files successfullyTo ensure all artifacts are there. Then run:
> node scripts/solve_challenge.js
✍ OK! Solving the Rareskills.io challenge...
✅ Metamorphic Factory Contract deployed to: 0x5FbDB2315678afecb367f032d93F642f64180aa3
✅ Challenge deployed to: 0xe7f1725E7734CE288F8367e1Bb143E90bb3F0512
✅ Contract One deployed to: 0x9fE46736679d2D9a65F0992F2272dE9f3c7fa6e0
✅ Initiate the challenge!
✅ Make sure we fail the challenge before calling with the strange contract
✅ Killed the first contract initially metamorphically deployed
✅ Contract Two deployed to: 0xa513E6E4b8f2a923D98304ec87F64353C4D5C853
✅ Metamorphosis successful - contract two has same address as contract one - but a different code hash!
🎉🎉🎉 Challenge solved! 🎉🎉🎉That's it!
Look in the scripts/solve_challenge.js file for more information and details on what is happening in each step.
I left inline comments to explain in more detail.
Reach out if you have any questions!
This project uses the following license: MIT.