Get the balance of an account that is confirmed at least a specified number of times.
Request:requestType is getGuaranteedBalanceaccount is the account ID
numberOfConfirmations is the minimum number of confirmations for a transaction to be included in the guaranteed balance (optional, if omitted or zero then minimally confirmed transactions are included)
Response:
(S) guaranteedBalanceNQT is the balance (in NQT) of the account with at least numberOfConfirmations confirmations
(N) requestProcessingTime is the API request processing time (in millisec)