I am a merchant that accepts bitcoins, and I'm building my own desktop client for receiving them in Java.
When I receive a transaction, I would like to be able to see in my client how much bitcoin is stored in the address that I am receiving from.
I have the full blockchain downloaded on my computer.
How can I access the balance of an address from the blockchain? I would like to be able to do this offline by accessing the blockchain stored on my hard drive.
Thanks in advance