@Override void validateAttachment(Transaction transaction) throws NxtException.ValidationException { Attachment.MonetarySystemCurrencyMinting attachment = (Attachment.MonetarySystemCurrencyMinting) transaction.getAttachment(); Currency currency = Currency.getCurrency(attachment.getCurrencyId()); CurrencyType.validate(currency, transaction); if (attachment.getUnits() <= 0) { throw new NxtException.NotValidException( "Invalid number of units: " + attachment.getUnits()); } if (attachment.getUnits() > (currency.getMaxSupply() - currency.getReserveSupply()) / Constants.MAX_MINTING_RATIO) { throw new NxtException.NotValidException( String.format( "Cannot mint more than 1/%d of the total units supply in a single request", Constants.MAX_MINTING_RATIO)); } if (!currency.isActive()) { throw new NxtException.NotCurrentlyValidException( "Currency not currently active " + attachment.getJSONObject()); } long counter = CurrencyMint.getCounter(attachment.getCurrencyId(), transaction.getSenderId()); if (attachment.getCounter() <= counter) { throw new NxtException.NotCurrentlyValidException( String.format( "Counter %d has to be bigger than %d", attachment.getCounter(), counter)); } if (!CurrencyMinting.meetsTarget(transaction.getSenderId(), currency, attachment)) { throw new NxtException.NotCurrentlyValidException( String.format("Hash doesn't meet target %s", attachment.getJSONObject())); } }