Metis Andromeda

The L1 Cross Domain Messenger (L1xDM) contract sends messages from L1 to Metis, and relays messages from Metis onto L1. In the event that a message sent from L1 to Metis is rejected for exceeding the Metis epoch gas limit, it can be resubmitted via this contract’s replay function.

The Canonical Transaction Chain (CTC) contract is an append-only log of transactions which must be applied to the OVM state. Given that transactions batch hashes are sent to an EOA address, it allows any account to enqueue() a transaction, which the Sequencer must eventually append to the rollup state.

The State Commitment Chain (SCC) stores a list of proposed state roots in a linked ChainStorageContainer contract. Only a permissioned state root proposer (MVM_Proposer) can submit new state roots.

• Roles:
  • admin: Metis Multisig

Contract acting as an escrow for METIS tokens managed by LockingPool.

• Roles:
  • admin: ProxyAdmin; ultimately Metis Multisig

Storage container for SCC batches.

Factory contract for creating dispute games. Unlike in standard OP Stack chains, games are not created to propose state roots. Instead, games are created on demand by the permissioned GameCreator only should a dispute arise.

• Roles:
  • admin: ProxyAdmin; ultimately EOA 2
  • gameCreator: Metis Multisig

• Roles:
  • owner: EOA 2

Contract used to manage configuration of global Metis values.

Storage container for CTC batches.

Main entry point for users depositing ERC20 tokens and ETH that do not require custom gateway.

• Roles:
  • admin: Metis Multisig
• This contract can store any token.

Contract for handling fault disputes (should games be created). Successfully disputed batches are marked as disputed to the StateCommitmentChain.

The Bond Manager contract will handle deposits in the form of an ERC20 token from bonded Proposers. It will also handle the accounting of gas costs spent by a Verifier during the course of a challenge. In the event of a successful challenge, the faulty Proposer’s bond will be slashed, and the Verifier’s gas costs will be refunded. Current mock implementation allows only OVM_Proposer to propose new state roots. No slashing is implemented.

MVM CanonicalTransaction is a wrapper of Canonical Transaction Chain that implements optimistic data availability scheme L1. If Sequencer is not malicious, it simply forwards appendSequencerBatch() calls to CanonicalTransactionChain.

• Roles:
  • admin: Metis Multisig

Oracle for providing preimages.

Oracle specifying user fees for sending L1 -> Metis messages and other parameters for cross-chain communication.

• Roles:
  • owner: Metis Multisig

Contract used to manage a mapping of string names to addresses. Modern OP stack uses a different standard proxy system instead, but this contract is still necessary for backwards compatibility with several older contracts.

• Roles:
  • _1088_MVM_Proposer: EOA 4
  • blobBatcher: EOA 3
  • txChainBatcher: EOA 1

Metis token contract.

Storage container for CTC queue.

Contract allowing users to lock tokens to apply to become a sequencer, receive rewards, unlock tokens to exit the sequencer, reward distribution.

• Roles:
  • admin: ProxyAdmin; ultimately Metis Multisig

The MVM Verifier contract is responsible for verifying the state of the MVM.

• Roles:
  • admin: Metis Multisig

Contract that allows METIS_MANAGER to switch Sequencer.

• Roles:
  • admin: Metis Multisig

Delayed wrapped Metis token contract.

• Roles:
  • admin: ProxyAdmin; ultimately EOA 2