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🔮 Orb and related contracts. Auction + Harberger taxed ownership + invocations.

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🔮 Orb Contract • test license

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.

Usage

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 terminal

License

Released under the MIT License.

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