3
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
1
Perhaps you can look at the source code of full-mode bitcoin implementations in Java, such as bitsofproof (BOF).
It seems bitcoinj also has a full-mode but it is experimental only and not really suitable for prod.
Hope this helps...
0
Using the bitcoinj Java library, you can retrieve your current balance very easily:
// To create your wallet.
public static NetworkParameters params = TestNet3Params.get();
public static String filePrefix = "forwarding-service-testnet";
public static WalletAppKit kit = new WalletAppKit(params, new File("."), filePrefix);
// to retrieve your balance.
String balance = kit.wallet().getBalance().toFriendlyString();
System.out.println(balance);
0
You can use this blockchain link to get the balance
https://blockchain.info/q/getreceivedbyaddress/THEIRBITCOINADDRESS?confirmations=6
while you request it from the java
Your example code uses the Bitcoin testnet, while the OP wants to know how to check the balance from his locally-downloaded blockchain. Can you update your answer accordingly? – Alin Tomescu – 2018-01-31T00:15:34.850