Bitbase is essentially Cryptocurrency based escrow service. The service, they are going to provide is about creating more trust factor between sender and buyer when they are dealing about some kind of service.
As per Bitbase:
"We are trying to make Cryptocurrency transactions safer for everyone to use and understand, by escrow we mean that anyone who use our service will benefit if they choose escrow when they sending coins to have it protected for a certain amount of time. So consider this you send the coins, the receiver will see the coins but won't be able to use them until you approve the transaction. "
Log back again, you will see 50 BTB in your account, hold it for future or reinvest.