Auction + Harberger taxed ownership. Used by orb.land. Uses Forge toolkit for building and testing. The contract combines the following areas of functionality:
- Auction. Allows the contract owner to start the Orb auction, determining the first Keeper of the Orb.
- Funds management. Allows any user to deposit and withdraw funds. Funds are used to make auction bids and pay Harberger Tax.
- Harberger Tax. Uses delayed accounting (settling) to allocate funds from the current Keeper to the contract beneficiary, based on the price set by the Keeper and tax rate.
- On-chain Orb Invocations. Allows the Keeper to periodically invoke the Orb, requesting a response from the Orb creator.
- ERC-721 compatibility. All transfers revert, but otherwise, the contract appears as supporting all ERC-721 functions.
The contract is fully documented in NatSpec format.
forge install foundry-rs/forge-std openzeppelin/openzeppelin-contracts # dependencies
forge test # tests
make anvil # local node
make deploy-anvil # deploy to local node in another terminalReleased under the MIT License.
- Eric Wall - Concept and mechanics design
- Jonas Lekevicius - Contract implementation
- Odysseas.eth - Tests, toolkit setup and many other contributions
- OpenZeppelin Contracts - Contract is based on OZ ERC-721 and Ownable implementations