What component of Hyperledger Burrow maintains the network stack and orders transactions?

The consensus engine is the correct component of Hyperledger Burrow that is responsible for maintaining the network stack and ordering transactions. In blockchain systems, the consensus engine ensures that all participants in the network agree on the state of the blockchain and the sequence in which transactions are executed. This is crucial for maintaining the integrity and reliability of the transaction history.

In Hyperledger Burrow, the consensus engine governs how transactions are validated and ordered before they are recorded on the ledger. It operates by allowing nodes to reach an agreement, thereby helping to prevent double-spending and ensuring that all nodes reflect the same data at any given time.

By centralizing the agreement on transaction ordering and execution, the consensus engine plays a pivotal role in the functionality of the network, making it a key component in the operation of Hyperledger Burrow. Other components like the Application Blockchain Interface (ABCI) and the smart contract application engine serve different functions, such as enabling communication between applications and the blockchain or executing smart contract logic, respectively, but do not directly handle network consensus and transaction ordering.