starkware-libs/starkex-contracts v2.0

StarkEx v2.0

on GitHub

StarkEx v2.0 is the first major update to StarkEx. Below are the main added features, both functional and non-functional.
Please note that the contract functions are not backward compatible and every interaction needs to be updated with the new version ABI.

Functional Features

• Conditional Transfer - Off-chain transfers conditioned on a predefined on-chain event
  • Allows arbitrary on-chain logic to be defined as the condition, thus allowing complicated interactions between L2 and L1.
  • Specifically, this primitive is used to facilitate Fast Withdrawals.
• Deposit - L1 users can deposit to any L2 user.
  • In v1.0 users could only deposit to their own account.
• Withdrawal - Users can withdraw to any recipient Ethereum address.
  • In v1.0 users could withdraw their funds from the contract only to the Ethereum address registered with that vault’s owner stark key.
• Register
  • Multiple StarkEx keys - Users can register many StarkEx keys to one Ethereum address.
    • In v1.0 the contract allowed only 1:1 mapping between Ethereum addresses and StarkEx keys.
  • Simplified Registration - Registration can be done by any sender.
    • In v1.0 the registered Ethereum address had to be the sender.
    • There is no need to own Ether in order to register.
  • Enhanced signature security - Added a prefix to the userAdmin signature.
    • This protects the userAdmin signer from an unexpected interpretation of their signature.
    • The userAdmin signature now has the following structure:
      bytes32 signedData = keccak256(abi.encodePacked("UserRegistration:", ethKey, starkKey)).
• ERC721 support - StarkEx now supports trading ERC721 tokens.
• Off-chain minting support - The StarkEx v2.0 contract supports off-chain minting of tokens of compatible ERC20MINTABLE / ERC721MINTABLE types.

Non-Functional Features

• Cairo - StarkEx v2.0 is fully implemented on top of Cairo - our Turing-complete framework for STARKs.
• Optimised statement design, supporting more efficient transaction packing in batches - enabling more transactions in each batch.