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1 answer
507 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://...
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 ...
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 ...
0 votes
1 answer
187 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 ...
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 ...
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 ...
2 votes
3 answers
26k views

Java code for Bitcoin Mining?

I am a student and doing research on Bitcoin. I wanted to know how mining is done but I wanted it see the some basic java code. Can some one provide me with resources? I would appreciate if some one ...
-1 votes
1 answer
939 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- ...
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 // ...
3 votes
2 answers
261 views

BitCoinJ for Cloud based application

I am currently working on a cloud based project that will be accepting payments using bitcoins. I intend to use BitCoinJ to handle the payment. Unfortunately the only help I am able to get is from the ...
5 votes
1 answer
634 views

How to build Merkle root from merkle branches?

Is there any help/tutorial on how to build the Merkle root from stratum data? The Slushpool's stratum protocol has an example of a mining job but it does not contain any Merkle branches and I don't ...
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 ...
1 vote
1 answer
306 views

How I can get all adresses from WIF private key?

I use Java and bitcoinj. I have a private key String str="5HpHagT65TZzG1PH3CSu63k8DbpvD8s5ip4nEB3kEsreAnchuDf"; I try to get compress and decompress 2 adresses in this format: ...
4 votes
2 answers
2k views

Library for trading on major exchanges

Is there a library which exposes order-book and trading functionality of major exchanges like BTC-e, Bitfinex, Cryptsy etc. ? I know these site have their own API but I wanted to re-use the code, if ...
1 vote
1 answer
72 views

Programming Bitcoin exercises in Java instead of Python

First I want to thank Jimmy Song for pointing me to this site. I'm running into a small problem with Chapter 4 Exercise 5: Find the Address corresponding to the public keys whose private key secrets ...
0 votes
0 answers
258 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 = "...
0 votes
1 answer
88 views

pokkst/litecoinj message verification problem - Address.fromKey() returning wrong address [closed]

I have a problem with java library pokkst/litecoinj. I am using the regular bitcoinj library to verify signed messages with success. As pokkst/litecoinj is a fork of bitcoinj I have expected it to ...
0 votes
1 answer
819 views

How to transform a private key into an ECKey?

I´d like to construct an ECKey from a hardcoded private key but it´s not working... First try If I run the code in this example the key import is working just fine. But since I actually want so send ...
2 votes
2 answers
898 views

how to create Watching Address from available xPub key

Watch-only wallet can only receive payments but not spend the available coins. I am using bitcoinj (in Java). Can anyone please tell me that How to create watching addresses from available xPub key? ...
1 vote
1 answer
171 views

Can I always set the first byte to 0x02 with the following implementation?

I've followed this tutorial on generating a Public Private key pair value and generating a valid Bitcoin address. But one part makes me wonder if the implementation is done correctly which is the ...
1 vote
0 answers
128 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 ...
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 ...
0 votes
1 answer
125 views

Is there a way to import bitcoin wallet into BitcoinJ?

I tried to create bitcoin wallet that could be available as from BitcoinJ as from standart desktop wallet client (Bitcoin.com client e.g.) but it seems that I don't get something important. I exported ...
0 votes
4 answers
10k views

MultiBit won't open, says "Java not installed"

My MultiBit wallet won't open, because "Java is not installed", though I have Java 8, 7u51, and 6u49 installed... Which version of Java should I have installed?
0 votes
1 answer
503 views

Standalone Java Bitcoin Miner - Does it Exist?

I am a java developer, and currently am looking to create a standalone java class that will let people mine Bitcoin using CPU, but I have no idea if such already exists. I have found one for LiteCoin, ...
1 vote
1 answer
2k views

Java: way to convert a 256-bit private key to WIF?

I have a question concerning Java and sha-256. I try to do these steps discribed here to create a WIF key: https://en.bitcoin.it/wiki/Wallet_import_format step: String string = "...
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(...
0 votes
0 answers
20 views

How to create signature for the payload (data)using private key in java with bitcoinj? [duplicate]

I have private key as 'cUN9LNcEC54HAbWAwUs6coPSc72TcQYzxf4qSqdHJPVKSapeHzFj' and payload as 'hello', now how to create the signature for this payload using private key in java with bitcoinj library? ...
1 vote
4 answers
3k views

How to get compressed public key with ECKey

Here some java code. What i need to change to get compressed public address in getPublicAddress? import com.google.bitcoin.core.Address; import com.google.bitcoin.core.ECKey; import com.google....
1 vote
1 answer
2k views

How to sign rawtransaction with private key

How to sign raw transaction with private key. this is my raw transaction : ...
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 ...
1 vote
1 answer
830 views

can i use one Mnemonic Code to create both(TestNet and MainNet) wallets

currently i am using bitcoinj library to create wallet for both Main-net and Test-net using Mnemonic code(Mnemonic Code is different for both), my question is can i create both Wallets(Test-net and ...
1 vote
1 answer
348 views

Is there anything I can do to speed up the synchronization of litecoinj? [closed]

I am using litecoinj which is forked from bitcoinj but compared to bitcoinj, the wallet creation and block synching is slow when using litecoinj. So, I searched for a solution and found a post that ...
0 votes
1 answer
409 views

Create Raw Transaction in BitcoinJ offline starting from UTXO info

I would to create offline Raw Transaction (without signing it) in BitcoinJ. The information I know about the inout is UTXO's hash, index, amount, address, and script. I also know the receiver address ...
0 votes
1 answer
65 views

I need a bitcoin or usd payment for my site

Just service with simple API. I want to allow clients to pay usd or bitcoin. Then after payment complete i need to add my custom value on my site client purse. Is there simple system for it? Back end ...
0 votes
1 answer
125 views

How to resolve eclair-node-gui-0.3.3-12ac145.jar getting CAPSULE EXCEPTION after java update to version 11.0.9.1?

I've been running Eclair node release eclair-node-gui-0.3.3-12ac145.jar smoothly for some time now on Ubuntu 18.04.5 LTS, but recently had an update to the java version i was using to the latest (?) ...
0 votes
1 answer
373 views

Importing bitcoinj mnemonic into electrum or deriving private keys from mnemonic

I am having a really hard time backing up my bitcoinj mnemonic and importing it somewhere else. I am backing up the mnemonic like so: Wallet wallet = Wallet.createDeterministic(params, Script....
0 votes
1 answer
116 views

Error message still returned after transaction was indeed broadcast

I use bitcoinj to create the following method to broadcast a raw transacion in testnet, and I did see on bitcoin explorer that it has been broadcast. But even the transaction has been already ...
1 vote
1 answer
465 views

Why does my implementation of hex to Base58check produce different results than the example?

Step 8 of this wiki page gives this hex value: 00010966776006953D5567439E5E39F86A0D273BEED61967F6 Step 9 converts it to this base58 string:16UwLL9Risc3QfPqBUvKofHmBQ7wMtjvM I'm trying to implement ...
1 vote
1 answer
823 views

How to verify a signed message by bitcoin core?

I want to verify, in Java, a signature produced with bitcoin core's signmessagewithprivkey (equivalent to the verifymessage). I noticed a bitcoinj method similar to the bitcoin core's verifymessage - ...
0 votes
2 answers
671 views

How to verify signature in java using message and public key?

I was trying different things to verify the signature but couldn't succeed. I have got the following: message in string or decimal array (ASCII code for each char) public key in decimal array (which I ...
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 ...
0 votes
1 answer
35 views

what are the dangers of transfering bitcoins between addresses?

So I heard stories about people losing bitcoins because their wallet didn't support a cerain feature.. or bitcoins getting sent to wrong address etc.. how does that happen? As a software developer I'...
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
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: ...
0 votes
1 answer
293 views

Bitcoin Signature Verification

I am trying to implement the OP_CHECKSIG opcode of Bitcoin and verify whether a signature is valid or not. I have the signature that I recieve from the transaction data and the public key(the hex ...
0 votes
1 answer
296 views

How to sign Bitcoin transactions using JCE?

I need to sign Bitcoin transactions using JCE primitives(no bitcoinj), but my signatures are not considered valid by bitcoinj. I tried to simulate this process. I created a random hash and signed it ...
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 ...
3 votes
1 answer
662 views

ECDSA signature with r value of 31?

occasionally on Android we are generating an ECDSA signature. This turns out to have a "r" length of 31 bytes. Is that valid? For reference here is a nice diagram outlining the ASN.1 structure of ...
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 ...