No, never. This is the first time, that's why I built BTCUSD not EURUSD. Changes in transaction records do not directly result in financial losses because all

No, never. This is the first time, that's why I built BTCUSD not EURUSD. Changes in transaction records do not directly result in financial losses because all the money is stored in more reputable exchanges and banks. Yes, integrity check of transactions is a must and we have it along with the generation of candlesticks (which also checks the integrity of quotes). Databases are automatically replicated and backed up. Application (transaction and request) logs have log drain set up and will be pushed to a syslog server for archiving. The databases are only accessible by the instances running this application. The filesystem of the application is read-only.