CompactBlockDownloader(lightwalletService: LightWalletService, compactBlockStore: CompactBlockStore)
Serves as a source of compact blocks received from the light wallet server. Once started, it will use the given lightwallet service to request all the appropriate blocks and compact block store to persist them. By delegating to these dependencies, the downloader remains agnostic to the particular implementation of how to retrieve and store data; although, by default the SDK uses gRPC and SQL.