Eth-Bridge Pallet

The Eth-Bridge Pallet is a component responsible for facilitating interactions between a Substrate-based blockchain and an Ethereum-based network. It implements the BridgeInterface and provides functionality for publishing transactions and generating lower proofs. This enables other pallets that implement BridgeInterfaceNotification to execute functions on the Ethereum-based smart contract or request proofs for token operations.

Key functionalities:

• Transaction Publishing and Management: Accepts and processes transaction requests from external pallets, handling them sequentially to ensure that they are executed in the order they are received. Publishes transactions by packaging and encoding them to be compatible with Ethereum, complete with timestamps and unique transaction IDs to track and verify their status.

• Consensus and Confirmation Collection: Manages the collection of ECDSA confirmations from authors to prove consensus for a transaction, ensuring that all required signatures are gathered before submission. Utilizes a confirmation system where authors can add their confirmations until the required threshold is met, after which the transaction is ready to be dispatched to Ethereum.

• Dispatching Transactions to Ethereum: Appoints an author responsible for sending a transaction to Ethereum once sufficient confirmations have been collected.

• On-Chain and Off-Chain Coordination: Integrates with off-chain workers (OCWs) to monitor unresolved transactions and prompt authors to act as needed. It also alerts the originating pallet with the outcome of a transaction through the BridgeInterfaceNotification callback, enabling state commitment or rollback based on the results.