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Changelog.md

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Changelog

How to review changes from the previous contest?

You can read the full diff between the scope for the previous contest here:

What's changed?

Protocol

Added

  • The Hyperchain - Moving from the single rollup architecture to the hyperchain, introducing SharedBridge and more.
  • Custom base token support - Now newly created hyperchains can select different tokens as tokens in which fee will be paid.
  • Validium support - Now newly created hyperchains can different Data Availability models to either send data to Ethereum or a third-party service.
  • RIP-7212 support
  • EIP-4844 support

Changed

  • Fee model changed.

L1 Smart contracts

Added

  • L1SharedBridge.sol - One contract that holds all funds across multiple rollups making the first step for fast messaging and cheap cross-chain transactions.
  • Bridgehub.sol - The single point of communication with all hyperchain contracts.
  • StateTransitionManager.sol - Contract that manages to create new chains, upgrading, freezing, and reverting batches on existing ones.
  • blobVersionedHashRetriever.yul - Contract wrapper for calling BLOB_HASH_OPCODE from the old Solidity version.

Removed

  • L2WethBridge.sol - Deprecated. In the future WETH token deposits will be natively supported by the shared bridge.
  • L2ERC20Bridge.sol - Deprecated in favor of L2SharedBridge

Changed

  • L1ERC20Bridge.sol - Remove the liquidity from the contract in favor of storing funds in L1SharedBridge.sol
  • Governance.sol - Now only the owner can cancel scheduled operation. execute/executeInstant are payable now.
  • Admin.sol - Changed the access control from Governance and Admin to State Transition Manager. Adopt functionality related to the Hyperchain changes.
  • COMMIT_TIMESTAMP_NOT_OLDER/COMMIT_TIMESTAMP_APPROXIMATION_DELTA - Reduced constant to minimize the possibility for the operator to manipulate L2 timestamps.
  • ValidatorTimelock.sol - Added support for multiple validators on different hyperchains.
  • Verifier.sol - Verification keys are updated.
  • Getters.sol - New getters added to reflect on other changes.
  • Executor.sol:
    • Support validiums and data blobs.
    • Added commit/prove/execute batch function mirrors to support the new Validator Timelock interface.
    • Added check for protocol version consistency with the State Transition manager.
    • Only one batch commitment is available at a time.
    • State Transition Manager now can revert batches.
    • Batch commitment changed.
  • Mailbox.sol:
    • Added function to migrate funds from zkSync Era to the Shared Bridge transferEthToSharedBridge
    • requestL2Transaction is restricted for use only in zkSync Era chain.
    • requestL2Transaction is deprecated in favor bridgehubRequestL2Transaction, access is now restricted only to the BridgeHub.
    • L1 -> L2 transaction cost is changed to reflect the new fee model and support of custom base tokens.
    • finalizeEthWithdrawal is restricted to zkSync Era.
  • Diamond.sol - _addFunctions/_replaceFunctions now checks that the added facet has deployed bytecode.
  • TransactionValidator.sol - validateUpgradeTransaction has strict checks. getOverheadForTransaction is changed to reflect changes in the fee model.
  • BaseZkSyncUpgrade.sol: _setVerifierParams skip changing parameters only if all parameters in _newVerifierParams are zeroes. Now the difference between protocol versions can't be bigger than 100.

L2 Smart contracts

Added

  • L2SharedBridge.sol - The L2 counterparty of L1SharedBridge.
  • L2StandardERC20.sol - Added function to reinitialize the getters variables.

Removed

  • L2WethBridge.sol - Deprecated. In the future WETH token deposits will be natively supported by the shared bridge.
  • L2ERC20Bridge.sol - Deprecated in favor of L2SharedBridge

Changed

  • ForceDeployUpgrader.sol - forceDeploy function is payable now and it is forward sent ether to the Deployer.

System contracts and Bootloader

Added

  • GasBoundCaller.sol - Contract that limits the amount of gas and pubdata child called contract can spend.
  • PubdataChunkPublisher.sol - Smart contract for chunking pubdata into the appropriate size for EIP-4844 blobs.
  • CodeOracle.yul - The contract used to emulate EVM's extcodecopy behavior.
  • P256Verify.yul - The contract that emulates RIP-7212's P256VERIFY precompile.

Changed

  • Bootloader.yul:
    • Added shouldMsgValueMimicCallBeSystem as protection from calling system contracts with isSystem flag without need.
    • Increased the maximal number of transactions in a batch to 10000 as well as the memory to 30000000 bytes. More of that memmory is dedicated to encoding pubdata since the EIP4844 support allows for two blobs per batch.
    • Fee model related changes. More on how the new fee model works can be read here.
  • MsgValueSimulator.sol - Added support of gas stipend to allow .transfer/.send Solidity features.
  • SystemContext.sol - Added support of changing chainID during the upgrade.
  • Compressor.sol - Added small protection of publishing very inefficient compression in publishCompressedBytecode
  • ContractDeployer.sol - extendedAccountVersion returns Version1 for all nonsystem contracts without bytecode.
  • DefaultAccount.sol - Fixed the issue with delegate call to the default account.
  • L1Messenger.sol:
    • Fixed the computational cost of sending logs in sendL2ToL1Log.
    • Added burning of spend pubdata according to the latest changes in the fee model.
    • Added support for submitting blobs data into L1.
  • IEthToken/L2EthToken/L2_ETH_ADDRESS - Changed the name to IBaseToken/L2BaseToken/L2_BASE_TOKEN_ADDRESS
  • SystemContractHelper.sol:
    • unsafePrecompileCall/burnGas - now burns pubdata in addition to gas.
    • getZkSyncMeta - now returns heapSize/pubdataPublished/auxHeapSize fields.
  • Ecrecover.yul - Cost changed.
  • Keccak256.yul - Padding is calculated in the zk circuit directly now.