All Abra transactions are verified by the blockchain -- that's how we ensure that the money you're sending is yours to send. It's one of the ways we prevent fraud in the system.
It can take up to 20 minutes (usually less) from the time digital money gets transferred to the time this transaction is verified. Exceptionally, it may take up to an hour for your transaction to be confirmed, depending on amount and network conditions. Until Abra gets verification that the transaction is a valid and unique one, you won't be able to send or withdraw the funds in your Abra account
If you experience trouble, please let us know at firstname.lastname@example.org.