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Smart Contracts' Changelog

All notable changes to the contracts will be documented in this file.

2021-02-06

Version 5.1 is scheduled for upgrade.

Added

  • MintNFT, WithdrawNFT operations, which enable native NFT support.
  • Swap operation, which depending on the implementation may serve either order book or atomic swaps functionality.
  • The security council, which is able to shorten the upgrade notice period. More on that here.
  • RegeneisMultisig.sol to handle submissions of the new root hash by the security council during the upgrade.
  • A special account with id 2**24 - 1. It is used to ensure the correctness of the NFT data.

Changed

  • The maximum amount of tokens that can be used to pay transaction fees is increased to 1023.
  • The account tree depth for each account increased to 32.
  • Due to the smart contract size limitations, ZkSync.sol was split into two parts: the original ZkSync.sol and the AdditionalZkSync.sol, to which some functionality is delegated.
  • ZkSyncNFTFactory.sol which serves as a default NFT factory, where all the NFTs are withdrawn by default.

2021-25-02

Version 5 is scheduled for upgrade.

Added

  • tokenGovernance address is added to the Governance contract. tokenGovernance can list new tokens.
  • TokenGovernance contract is added to allow anybody to pay fee and list new tokens.

Changed

  • Maximum amount of tokens that can be used to pay tx fee is increased to 512.
  • Circuit now enforces that ForcedExit target account pubkey hash is empty.

2021-09-02

Version 4 is released.

2021-14-01

Version 4 is scheduled for upgrade.

Added

  • Multiple blocks can be committed, proven or executed with one transaction.
  • Rollup block timestamp is added.
  • ChangePubKey can be authorized without L1 transaction for smart-contract accounts that can be deployed using CREATE2 function with specific salt.
  • Block processing is split into three parts: commit, proving onchain, execution. Block is finalized when its executed.
  • Governance now can pause deposits of some tokens.
  • New events Deposit(token, amount), Withdrawal(token, amount) are added when funds are deposited or removed from the contract.

Changed

  • Cost of Deposit and FullExit for user is reduced significantly.
  • Priority queue storage format is changed for gas cost optimization.
  • Block storage format is changed for gas cost optimization.
  • ChangePubKey message that should be signed by ETH private key is changed.
  • Upgrade notice period is increased to 2 weeks.
  • ChangePubKey with L2 public key that was authorized onchain can be reset if needed after waiting period of 1 day.
  • Maximum gas limit for ETH and ERC20 token withdrawal from zkSync contract is set to be 100k.
  • Proof of the L2 funds in the exodus mode now can be provided by anyone on behalf of any user.
  • Withdrawal from zkSync contract (funds that are withdrawn from L2 but failed to be pushed out of the zkSync contract) now can be done on behalf of any user.
  • Some of the public variables are made internal.
  • Withdraw from the zkSync contract now should be performed using withdrawPendingBalance instead of (withdrawETH, withdrawERC20).
  • Multiple functions and variables are renamed:
    1. fullExit -> requestFullExit
    2. exit -> performExodus
    3. triggerExodusIfNeeded -> activateExodusMode
    4. balanceToWithdraw -> pendingBalance

Removed

  • Pending withdrawal queue is removed, instead we try to execute token transfers when we finalize block.
  • All events for user operations (Deposit, Withdraw, etc.) are removed.

2020-09-04

Version 3 is released.

Added

  • ForcedExit operation which allows user to force a withdrawal from another account that does not have signing key set and is older than 24h.

Changed

  • ChangePubKey operation requires fee for processing.

2020-07-20

Version 2 is released.

Added

  • Event denoting information about pending and completed withdrawals.
  • Support for tokens that aren't fully compatible with ERC20.

Changed

  • Block revert interval is 0 hours.
  • PRIORITY_EXPRIRATION_PERIOD is reduced to 3 days.
  • UPGRADE_NOTICE_PERIOD is increased to 8 days.

Removed

  • Redundant priority request check is removed from contract upgrade logic.