Registry

The Registry is a contract deployed on L1 that tracks canonical and historical rollup instances. It allows you to query the current rollup contract and look up prior deployments by version.

Links: Interface, Implementation.

numberOfVersions()

Retrieves the number of versions that have been deployed.

registry_number_of_versions

function numberOfVersions() external view returns (uint256);

^{_{Source code: l1-contracts/src/governance/interfaces/IRegistry.sol#L25-L27}}

Name	Description
ReturnValue	The number of versions that have been deployed

getCanonicalRollup()

Retrieves the current rollup contract.

registry_get_canonical_rollup

function getCanonicalRollup() external view returns (IHaveVersion);

^{_{Source code: l1-contracts/src/governance/interfaces/IRegistry.sol#L17-L19}}

Name	Description
ReturnValue	The current rollup

getRollup(uint256 _version)

Retrieves the rollup contract for a specific version.

registry_get_rollup

function getRollup(uint256 _chainId) external view returns (IHaveVersion);

^{_{Source code: l1-contracts/src/governance/interfaces/IRegistry.sol#L21-L23}}

Name	Description
_version	The version identifier of the rollup
ReturnValue	The rollup for the specified version

Other view functions

Function	Returns	Description
getVersion(uint256)	uint256	Returns the version number stored at the given index in the historical versions list
getGovernance()	address	Returns the governance contract address (owner)
getRewardDistributor()	IRewardDistributor	Returns the reward distributor contract

Related pages

• Inbox - L1 to L2 message passing
• Outbox - L2 to L1 message passing
• L1-L2 Communication (Portals) - Overview of cross-chain messaging