Skip to main content

Questions tagged [java]

Java is a programming language.

28 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
4 votes
1 answer
2k views

Building Signed Bitcoin Transaction in Java

I have been attempting to build my own raw transaction generator in Java which I can then broadcast on the testnet network. The problem is when I attempt to broadcast the transaction it says there is ...
user2965346's user avatar
3 votes
2 answers
802 views

How to sign a transaction using BitcoinJ

I am having problem signing the transaction using BitcoinJ library without the Wallet instance, I only have the Transaction class instance and the ECKey in order to sign the transaction. Is there a ...
Firass Obaid's user avatar
2 votes
0 answers
335 views

Broadcasting signed transaction from Watching wallet using bitcoinj

I am working with watching wallet and Offline wallet using bitcoinj, I created Watching Wallet using tpub key of Offline Wallet I am receiving payment on watching wallet Fine, now I want to ...
Zombie's user avatar
  • 548
1 vote
1 answer
506 views

Generating HD Wallet Addresses in Java Using Bitcoinj

Is there some method that can be used to get the address, private and public key for any type of supported coin in a HD wallet? I can correctly generate these for Ethereum, which I verified on https://...
Bob Marshall's user avatar
1 vote
0 answers
127 views

Java bip32 library

I'm looking for java library that will cover bip32 address derivation (xpub to P2PKH, P2SH, P2WSH, P2WPKH, P2SH-P2WPKH). There seem to be a lot of libraries covering P2PKH, but not much else (like ...
Tony Sanak's user avatar
  • 1,699
1 vote
1 answer
281 views

Fail to sign the Segwit Transaction's input in bitcoinj

I want to spend from a segwit address and it has a P2WPH script, I created this transaction just like creating a normal P2PKH transaction, but just changed the address of the input to the segwit ...
Oiiiwk's user avatar
  • 31
1 vote
0 answers
82 views

How to sign a 2-of-2 multisig address?

I want to implement 2-of-2 multisig in bitcoinj, and I implement the methods which are used to sign the first time and the second time. But there is a bug that using the same key for the first signing ...
Oiiiwk's user avatar
  • 31
1 vote
0 answers
100 views

How to sign an Altcoin transaction manually with 2 inputs and 2 outputs

So i'm working with the altcoin denarius which has the following raw TX structure. This is a transaction I am try to sign: Original: ...
Roxas240's user avatar
1 vote
0 answers
62 views

Bitcoinj Spend from a address directly without wallet

I am stuck trying to send coins from arbitary privateKey in bitcoinj. How can I make the following function work without using the Kit or Wallet classes? @Override public String transferCoin( ECKey ...
Sudip Bhattarai's user avatar
1 vote
0 answers
346 views

List of crypto currencies built with java?

Is there a list of crypto currencies that was built with Java?
Patoshi パトシ's user avatar
1 vote
0 answers
385 views

Block chain receive payment api not working

I am building a little online app to accept bitcoin payments in my website. I have a blockchain.info wallet and I am following their Receive Payments Api, which can be visited here: http://blockchain....
Ketan Patel's user avatar
1 vote
0 answers
135 views

How return transaction hash from wallet to android app after payment?

Scenario: I have my android app where customers can pay by bitcoins. For this I created intent with uri like: bitcoin:[address]?amount=.. and using startActivityForResult it opens wallet with ...
Alex's user avatar
  • 183
1 vote
0 answers
164 views

blockChainDownloadLocked ignoring the duplicate request error

I work with a bitcoin wallet app using the Java/BitcoinJ. The app has custom features such as showing balance, transactions, address and sending option. It was running fine and suddenly, I get the ...
Arefe's user avatar
  • 223
1 vote
0 answers
45 views

Is there a java library which could extract the first seen date and the last seen date of an address over a bitcoin network?

Apparently the bitcoinj does not provide such feature.
Aqqqq's user avatar
  • 305
1 vote
0 answers
161 views

API request of blockchain.info over Java stops spontaneously

In my java class, I extract the hash of transactions from the files of blk...dat, then obtain the data of the corresponding transactions via reading from the URL: https://blockchain.info/rawtx/+ hash. ...
Aqqqq's user avatar
  • 305
1 vote
0 answers
160 views

Payment Transaction Validation

I want to build a app which takes transaction id, source and destination address as input and need to validate the transaction (the specified amount is sent from address1 to address2. What is the ...
Jamy's user avatar
  • 11
1 vote
0 answers
55 views

Verification exception : Unexpected

i have cloned litecoin wallet and edit it connect to the network we have created. I disabled checkoints, changed params and the block syncs for 32 blocks. Then i get the following error 05-26 13:07:...
Victor Benetatos's user avatar
1 vote
0 answers
241 views

Why I can't see the balance increasing in my wallet?

I wrote this function using bitcoinJ public Wallet getWallet(ECKey ecKey) { Wallet wallet = walletAppKit.wallet(); wallet.importKey(ecKey); wallet.addEventListener(new ...
sfrj's user avatar
  • 163
1 vote
0 answers
222 views

bitcoinj, unknown confidence level

I've got a bitcoin address A with its relative encrypted key K stored in a persistence storage. I am launching bitcoinj through the WalletAppKit class and calling awaitRunning to wait for the ...
Riccardo Casatta's user avatar
1 vote
0 answers
173 views

How to use Bitcoinj to authenticate signed messages?

I'd like to authenticate from java code on a website that makes use of javascript/ajax authentication like below: var key = new Bitcoin.ECKey(Crypto.util.hexToBytes(SHA256(password))); var ...
membersound's user avatar
1 vote
0 answers
122 views

BitcoinJ without PeerNetwork

I am writing a system which generates wallets on a per user basis. It must be capable to receive and send payments. So I have to keep the private keys encrypted on the system. Generating the ...
mkuff's user avatar
  • 119
0 votes
0 answers
257 views

Generate P2SH bitcoin address from WIF in BitcoinJ Java

I'm trying to create P2SH-Segwit bitcoin address from the WIF private key. I'm using the BitcoinJ library in Java. See the following code. String base58PrivateKeyString = "...
Lakshitha Kanchana's user avatar
0 votes
1 answer
185 views

Add bitcoin payments to java app using BitcoinJ

I need to add Bitcoin payment to my application using the BitcoinJ library, but I'm new to using Bitcoin. I have one thought To create a new address for each new user, but I don't know if this is the ...
Oleksii Tulei's user avatar
0 votes
1 answer
293 views

GDAX Java Limit Order (HTTP Post)

Trying to send HTTP Post request to GDAX with auth. The 'GET' requests work fine and I'm unsure if I am passing the json params correctly as I keep getting Bad Request. private static JsonObject ...
X4RQ's user avatar
  • 3
0 votes
0 answers
221 views

Library ZMQ to Java does not work

I am trying to connect to a bitcoin node using the ZMQ library for Java. the problem is that when I try to receive a response the code remains frozen. Returns nothing. This is my code: public class ...
Ander Acosta's user avatar
0 votes
0 answers
2k views

blockchain.info websocket: Error code = 1006, Unexpected end of stream

I am using javax.websockets to have a webSocket connection with Blockchain.info, except that it closes down after random intervals, and I can see the close reason as: 'Unexpected end of stream', ...
Syed Waqas's user avatar
0 votes
0 answers
223 views

Verifying mrkl_root from two children nodes in JAVA

Let's use the following block for a reference: http://blockexplorer.com/rawblock/00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d According to my understanding (correct if wrong), I ...
Tyrick's user avatar
  • 101
-1 votes
1 answer
938 views

How can I generate public address from an xpub key in Java?

I have an xpub key with which I want to generate all addresses which have been used or will be used and then find out the keys which have balance. Here's a sample xpubkey with balance- ...
Parth Gargava's user avatar