Questions tagged [java]

Java is a programming language.

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32 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 ...
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0answers
18 views

What type of interface would be best for creating my own Blockchain in Java? [closed]

So I'm trying to do a mini-project and create my own Blockchain. I'm not looking to make anything complex, just a relatively basic Blockchain. I feel like I understand the basics of how a PoW ...
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0answers
23 views

Sign Multisignature Transaction with only 1 of the needed keys using BitcoinJ?

If I have an unsigned Raw Transaction whose inputs are from a multisignature wallet, can I sign the transaction with only of the N needed keys and having the output as raw transaction again using ...
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1answer
52 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 (?) ...
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1answer
42 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 ...
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1answer
86 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....
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0answers
26 views

How to get transaction info by hash using bitcoinj?

I have a transaction hash (transaction does not belong to my wallet). How can I get information about this transaction through bitcoinj API? I need information like: number of confirmations sender &...
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2answers
172 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 ...
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1answer
26 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 ...
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0answers
32 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 ...
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1answer
53 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 ...
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1answer
50 views

How can Server-less communication take place between clients?

I was thinking to design a application which is not dependent on server and can directly send and receive data to and from other clients.I learned it is possible with UDP but how can new users join in ...
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1answer
252 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 - ...
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1answer
23 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'...
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2answers
152 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 // ...
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1answer
128 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, ...
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0answers
81 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: ...
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1answer
105 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 ...
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1answer
145 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 ...
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1answer
321 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- ...
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1answer
853 views

How to sign rawtransaction with private key

How to sign raw transaction with private key. this is my raw transaction : ...
3
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1answer
249 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 ...
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1answer
128 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 ...
2
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1answer
42 views

How to convert from Ardor time to Unix time?

What is the best approach to convert from Ardor time to Unix time?
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1answer
605 views

How to create ECPoint from raw private key

How to create a bouncy castle ECPoint from a raw private key hex string? I am getting a private key using the 'dumpprivkey' RPC and removing the header byte and the 4 bytes of checksum + 1 byte of ...
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0answers
53 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 ...
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1answer
489 views

Bitcoinj wallet can't receive coins in Testnet3

I have a problem with bitcoinj. I have created a wallet and than trying to send coins to it in Testnet3 using this faucet: https://coinfaucet.eu/en/btc-testnet/ Coins sended, transaction confirmed, ...
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1answer
116 views

Can't see balance after some time

I'm trying to use bitcoinj library to receive bitcoin payments and monitor the balance on the address. My implementation is based on DeterministicKey watching public key. The code below is working ...
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1answer
205 views

Problematic Digital Signature with SECP256K1

I am trying to test out TestNet3 and I have a keypair generated using Java crypto library. The private key is 23F847360E1EB348A212F443C633058080A8EB9F05AD132F8B82D51FE672EADD and the public key is ...
1
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1answer
533 views

Java mining solution

I am a beginner in mining algorithms and I have a general question regarding the mining using Java language. Does it make sense to use Java to develop for example ETHASH algorithm (or any other) and ...
2
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0answers
270 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 ...
3
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1answer
2k 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
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1answer
440 views

How to use Signed Hash to Send Coins in bitcoinj

I am very new to bitcoinj library. I am using 0.14.7 version of bitcoinj and developing my own application in java. I have created a watch-only wallet by using the tPub of the Offline wallet. Upto ...
2
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1answer
105 views

Handling fees and setting them

Im trying to get the estimation of how much the fees will be when a final amount is decided on. I would say im getting familiar with bitcoinj but not completely with java so im still learning how to ...
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1answer
149 views

connect watching wallet with blockchain

i have created watch wallet Wallet wallet = Wallet.fromWatchingKeyB58(params, tPub, DeterministicHierarchy.BIP32_STANDARDISATION_TIME_SECS); How can i link this with block chain i am using ...
2
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1answer
629 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? ...
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1answer
311 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 ...
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2answers
972 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 ...
0
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1answer
123 views

Cancel pending transaction (bitcoinj)

I'm using bitcoincashj (https://github.com/bitcoinj-cash/bitcoinj) I created a transaction and sent it. But it didn't broadcasted to network. Can I cancel this transaction? Current wallet status is: ...
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0answers
274 views

List of crypto currencies built with java?

Is there a list of crypto currencies that was built with Java?
2
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2answers
813 views

How to find ripple faucet coin for development

I'm developing an app with ripple. I need some faucet coin for ripple. How can I find it?
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2answers
940 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 ...
3
votes
1answer
2k views

Get Historical Bitcoin Prices on GDAX in CSV Format

I'm looking for minute by minute historical Bitcoin price data for the past year in format: time, open, high, low etc. I code in Java and I'm not familiar with other programming languages (such as ...
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2answers
143 views

Code example for Ardor bundler code snippet to filter transactions of a certain criteria to pay ZERO 0 ignis Fees?

I'm looking to write a custom Ardor bundler to only bundle transactions that have the following properties: Bundle transactions that are being sent to a specific account only. Bundle transactions ...
0
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1answer
264 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 ...
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2answers
121 views

Unable to execute getwork logic in java

I was going through this post in stack exchange How can I code a Bitcoin JSON-RPC “getwork” request in Java? I tried to write a simple snippet for just the getwork json rpc. public static void ...
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1answer
576 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 ...
2
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1answer
819 views

How to create an offline wallet on Android only to sign transaction

I am new to bitcoins, I want to create an offline wallet on Android, to scan transaction QR code from online Desktop wallet, Sign that transaction with private key on my offline wallet. 1 Creating ...
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3answers
2k 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....
2
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3answers
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....