BroadcastTransactionProtocol(notarisedTransaction: SignedTransaction, participants: Set<Party>)Notify all involved parties about a transaction, including storing a copy. Normally this would be called via FinalityProtocol.
notarisedTransaction - transaction which has been notarised (if needed) and is ready to notify nodes about.participants - a list of participants involved in the transaction.Return
a list of participants who were successfully notified of the transaction.