Completing the loop – subscribing to blockchain events

As we have seen in previous chapters, commitments to the shared ledger on a permissioned blockchain require a consensus among the network peers. Hyperledger Fabric in its v1 incarnation has an even more unique process to commit to the ledger: the transaction execution, ordering, and commitment processes are all decoupled from each other and framed as stages in a pipeline where endorsers, orderers, and committers carry out their tasks independent of each other. Therefore, any operation that results in a commitment of a block to the ledger is asynchronous in the Fabric scheme of things. Three of the operations we have implemented in our middleware fall into that category:

  • Channel join ...

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