At what point in the lifecycle of a Hyperledger Fabric transaction is a block created?

A block is created during the transaction ordering phase in the Hyperledger Fabric lifecycle. After transactions have been endorsed by the relevant peers according to the endorsement policy, they are then grouped together in the ordering service before being packaged into blocks.

The ordering service's main responsibility is to take these endorsed transactions and establish a specific sequence for their execution. Once the transactions are ordered, they are formatted into a block, which is then sent out to all the peers in the network for validation and commitment to the ledger.

This phase is crucial as it ensures that the transactions are processed in the correct order, which helps maintain consistency across the distributed ledger. After the creation of the block, the transactions within it will undergo validation and subsequent commitment to the ledger, but the actual creation of the block itself occurs distinctly during this ordering phase.