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Questions tagged [java]

Java is a programming language.

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7 votes
1 answer
5k views

How to sign raw transaction given a private key and SHA hash (in java)

I have followed the instructions here to build my own bitcoin transaction. Redeeming a raw transaction step by step example required Currently my code can create a transaction and compute the SHA ...
alex676's user avatar
  • 73
5 votes
2 answers
5k views

How do I create an offline transaction in java to broadcast via blockchain.info?

Blockchain.info has a PushTX API. How do I create & sign a raw transaction in Java for use in this API? Should I use bitcoinj? Are there any code samples?
ripper234's user avatar
  • 26.6k
3 votes
1 answer
3k views

Generating private keys in Java

I'm looking for a way to generate private keys in Java. I'd like to make this a standalone program, so I'd rather not use a library like bitcoinj. From my research I've only seen people recommend ...
busterroni's user avatar
7 votes
9 answers
8k views

How to communicate between Java and bitcoind?

I am having problems communicating between Java and bitcoind - every JSON RPC library I try has some issues. Can anyone provide a working implementation of even the most basic JSON RPC communication ...
ThePiachu's user avatar
  • 43.1k
6 votes
1 answer
683 views

Test Network Genesis Block

I am using BitcoinJ for my java application which fetches the test network's genesis block. I referred to the basics mentioned at JavaWorld and BitcoinJ's Google Code wiki. I am able to get it ...
Raghav Bali's user avatar
3 votes
1 answer
3k views

Bruteforce bitcoin address - I know the words + public address but not the order

I have a long list of 1million+ permutations of a 12 word BIP39 seed. How can I try them all on a bitcoin address? edit: I know the address and the 12 words but i don't know the order of the words
code511788465541441's user avatar
3 votes
1 answer
1k views

Bitcoind returning "Invalid JSON-RPC 2.0 response"?

I am starting to use a basic implementation of Bitcoin JSON RPC (dzhuvinov library), and I am getting a strange result. Here is my code: public static void main(String[] args) { URL serverURL = ...
ThePiachu's user avatar
  • 43.1k
3 votes
2 answers
251 views

Accept payments on someone else's behalf without being able to spend them

TL;DR I wish to store some sort of key in my application for each vendor account that allows for my application to generate a receiving address for clients to make payments to. I am writing some ...
S. Buda's user avatar
  • 145
3 votes
1 answer
2k views

How can I create a raw transaction in hex format with Bitcoinj?

How can I create a raw transaction when I'm given the input scripts, input indexes, input txids, output script, output address and output amount? The method below works but it requires the method ...
user299648's user avatar
2 votes
3 answers
2k views

Convert between String/Hex/Byte in Java for sha256 - wrong format?

I am trying to convert a bitcoin address and have the following code from here (Calculate Segwit address from public address, 2nd answer): Step1: $ printf 1L88S26C5oyjL1gkXsBeYwHHjvGvCcidr9 > adr....
A.c's user avatar
  • 145
1 vote
2 answers
1k views

How do i parse the zeroMQ messages in java?

This is the code that i have. I receive messages from the zeroMQ however a hashtx message for example looks like this --> "hashtx �����v����|(8d �!��v��&�-�k�". Any help in turning that into a ...
dudious maximus's user avatar
1 vote
1 answer
240 views

Errors when building/sending multisig transactions

Going by the example here: https://bitcoinj.github.io/working-with-contracts I believe I've done everything correctly. Yet my program fails either to propagate correctly or because of a tx error and ...
Stephen's user avatar
  • 13
1 vote
2 answers
1k views

JAVA JSON-RPC for Litecoin

I am looking for Java Json-Rpc for Litecoin or any implementation for Litecoin
Aman Vyas's user avatar
0 votes
2 answers
2k views

generate wallet addresses from extended public key

i am trying to generate addresses from Extended Public Key using bitcoinj but can't figure out, how can i possibly do this. i need those addresses for watch-only wallet, those addresses were ...
Zombie's user avatar
  • 548
0 votes
1 answer
174 views

API for automatical buying and selling coins in Java [closed]

I need to create a simple bot for buying and selling coins and the programming language needs to be Java due to some technical specifications. These are the functions which I need from that API: buy(...
Jakov's user avatar
  • 103
0 votes
2 answers
372 views

Verify Bitcoin Transaction

Following the great post [Redeeming a raw transaction step by step example required, I came up with code below but the verification failed. // pubkeyBytes, len: 65 // ...
YongJiang Zhang's user avatar