The diagram above demonstrates the process of propagating World ID Merkle tree roots from the WorldIDIdentityManager
contract (located in the world-id-contracts repository) on the Ethereum mainnet to the LineaWorldID contract
World ID Merkle tree roots are retrieved from the WorldIDIdentityManager contract by invoking the latestRoot()
public method. These roots are then sent to the LineaWorldID contract using its receiveRoot() method, facilitated by the
propagateRoot() method. This process ensures that the Merkle tree roots are accurately and efficiently propagated from
the WorldIDIdentityManager to the LineaWorldID contract.
The LineaStateBridge contract is an integral component in the architecture designed to facilitate secure and efficient
communication between Ethereum and Linea. it's primary purpose is to serve as a trusted intermediary that retrieves
Merkle tree roots from the WorldIDIdentityManager contract on Ethereum and delivers them to the LineaWorldID
contract on the Linea blockchain. This process ensures that state updates are accurately propagated across both
blockchains.
The propagation process incurs transaction fees on both the Ethereum and Linea blockchains. The LineaStateBridge
manages these fees, requiring periodic transactions to be initiated and paid for by users or designated operators. This
ensures the continued operation and data consistency of the system