NewAccountLedgerService create instance of AccountLedgerService.

NewBlockService create a singleton instance of BlockService.

NewEscrowTransactionService will create EscrowTransactionServiceInterface instance.

NewHostService create a singleton instance of PeerExplorer.

NewBlockService create a singleton instance of BlockService.

NewParticipationScoreService creates a singleton instance of ParticipationScoreService.

NewPublishedReceiptService creates an instance of PublishedReceiptService.

NewTransactionService creates a singleton instance of TransactionService.