Questions tagged [client]

This tag should be used for questions regarding Bitcoin clients. A client is any application which allows a user to connect to the Bitcoin (or alternate) network. Alternately, "client" may refer to a non-standard user interface which interacts with the Bitcoin network through a standard client.

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1answer
268 views

Official or default Bitcoin wallet for Android

I'm new to cryptocurrencies, and I noticed that both Litecoin and Dogecoin have official wallet apps for Android. Does Bitcoin similarly have an official Android wallet app? If not, is there a ...
3
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1answer
741 views

Why does the Bitcoin core client use so much CPU time while synching?

I have always noticed the huge increase in cpu usage when I opened my client for the first time in a few days. I was wonder what this is from? I would imagine verifying all of the signatures of the ...
3
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1answer
89 views

How are mutated transactions prevented from getting relayed?

Quoth Bitcoin release-notes-0.9.0.md: This release contains a few fixes for transaction ID (TXID) malleability issues: -nospendzeroconfchange command-line option, to avoid spending zero-...
3
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1answer
490 views

How does the satoshi client handle endianness?

I'm looking through the source code of the satoshi client, particularly into how transactions are serialized and sent through the network or stored to the disk. The CTransaction class has this block: ...
3
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1answer
1k views

does blockchain.info have everyone's private key?

I'm looking at blockchain.info's FAQ page, and they describe the wallet creation scheme here: https://blockchain.info/wallet/technical-faq (please scroll down to the Please describe the wallet ...
3
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1answer
1k views

Cannot recover wallet from 12 word BIP 39 seed generated by Bread Wallet on iOS

I still have access to my Bread Wallet on iOS, but I'm trying to test my setup and make sure that I can recover my wallet if for some reason Bread wallet didn't work or if I simply wanted to change ...
3
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1answer
254 views

Can a bitcoin cold wallet become incompatible

(newby-question) If I plan to use a cold wallet for longterm storage without following the news around bitcoin and my cold wallets application does not get maintained anymore in the meantime, can it ...
3
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2answers
812 views

Does Armory work with a pruned copy of the blockchain?

I'm recovering a wallet from Armory and the blockchain is taking too much space. My HD is 500 GB big but none of my partitions have more then 70 GB left. The folder .bitcoin/blocks already uses 37 GB ...
3
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1answer
1k views

searchrawtransactions in bitcoin-cli returning "Method not found" error

some days ago I installed bitcoin core patched with the addrindex option ( btcdrak version ), after indexing the entire blockchain for 5 days, I tried to use the searchrawtransactions parameter on ...
3
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1answer
416 views

0 Active Connection on my-new-coin

I have compiled my-newcoin-qt and my-newcoind on different platforms (windows, Linux and Mac), with my coin specification based on litecoin. When I run my-newcoin-qt at the first time, I get no error ...
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2answers
2k views

I think my bitcoin wallet was hacked. What to do?

I opened bitcoin-qt after not mining for a couple months and found that I suddenly have no more bitcoins! And I see that there were 2 transactions that I did not authorize sending my coins to other ...
3
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1answer
115 views

Are there clients that manage several alts?

E.g. a desktop client that can manage, in a unified UI, Bitcoin, Namecoin, Litecoin, PPCoin...?
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2answers
3k views

Bitcoin-qt v0.8.0b client on Mac OS X 10.8 crashes, why?

I was running the stable 0.7.2 bitcoin-qt client (under OS X 10.8.2) for a couple of weeks, with the block-chain completely sync'ed on an ongoing basis. No transactions in my wallet. I upgraded to ...
3
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1answer
670 views

Error on Installing Multibit for Windows 7?

I recently found about Bitcoin through a friend and got interested to surf about it over the Internet. I was installing Multibit on my machine running on Windows 7 but as soon as I click on the ...
3
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1answer
136 views

What is the actual reason for using boost:signals for few functions?

The src/main.cpp has RegisterNodeSignals and UnregisterNodeSignals to register the functions as boost signals as below: void RegisterNodeSignals(CNodeSignals& nodeSignals) { nodeSignals....
3
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1answer
83 views

How will the new Internet Neutrality Act affect Bitcoin?

How do you think the neutrality act that is being talked about as I write this post will affect the Bitcoin community. Not only in transactions, but mining, how will it affect Bitcoin economically ...
3
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1answer
268 views

Which clients offer a way to replace unconfirmed transactions?

On this site, we see a lot of questions from people who have sent a transaction which isn't being confirmed, often because they have neglected to include an adequate fee. The Satoshi client doesn't ...
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2answers
745 views

Searching for the comprehensive guide to creating Crypto Currency

A few months ago I came across (by accident) a very detailed and well written guide on how to create your own crypto-currency from the bitcoin source code. I skimmed through it and "Stared" in ...
3
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1answer
7k views

How do you connect to the Bitcoin Client?

So I just started writing a rails app that will be an online wallet. I'm looking over the API code examples for connecting to the bitcoin network at https://en.bitcoin.it/wiki/API_reference_(JSON-RPC)....
3
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1answer
201 views

Compromised Bitcoin clients?

Are there any known cases of compromised Bitcoin clients (whether proprietary or free)? I don’t mean separate malware that attacks installed clients, but malware that is included in the client itself....
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2answers
869 views

Transaction delayed >12 hours by Satoshi Bitcoin client

Yesterday I sent 20 BTC to 1Hj8kJ3rq4c4Hn9Prtw45Zue791f4Nc9L3 with a 0.0001 fee and transaction Id 30d1ef9aa05898b11b5ee4f5f5e703a822a821fb499c647b658fc3cb67a899b8. My Satoshi client said today that ...
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1answer
3k views

Synchronising official bitcoin wallet for the first time; at 95% started going backwards

I.E. 9900 blocks remaining, 9904 blocks remaining and the total percent synced is decreasing. Is this normal behaviour? I'm on a mobile broadband connection but http connections are working just fine. ...
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0answers
60 views

How to segregate wallet from bitcoin core | Run multiple wallets in different servers on one centralized bitcoin node

I am running bitcoin full node in a centralized server. I have many web applications running in various places. I want to connect this web applications with centralized full bitcoin node. How to ...
3
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4answers
434 views

Is there an open source (free) client or code for bitcoin transactions [duplicate]

Possible Duplicate: How can I accept bitcoins on my website? I have a few websites I am working on, but is there an open source code I can use that will allow people to deposit bitcoins on my ...
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2answers
136 views

How does the architecture prevent someone taking over by running a several billion clients?

I'm new to bitcoin and was wondering: As far as I know, bitcoin relies that the majority of the users is to be trusted. Why is it not a problem then if someone starts up billions of clients, eg. a ...
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2answers
76 views

Is it possible to capture network events without going full-node?

You might find my question rather quixotic or nonsense. But I have to ask it here. I want to capture all the transactions propagated over the main network and detect if a new block mined. I don't want ...
2
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1answer
213 views

What contributes more to bitcoin network? Using Bitcoin-Qt or running a miner?

What would make a better support for bitcoin? Does it really makes any difference to store blockchain locally instead on a remote server?
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4answers
999 views

Is it wrong to spend Bitcoin from someone else's wallet if my Bitcoin client generates the same address?

I know this scenario is extremely unlikely but what-if by chance I get the same Bitcoin address as another user and the user has hundreds or thousands of Bitcoins in his wallet, is it morally/legally ...
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3answers
202 views

Where to find cryptocoins current price

How can I find API (json data) for cryptocoins current ask/high/low/average price. Is there any website that provides that ticker information for all coins. For example BTC/LTC ticker info is ...
2
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1answer
3k views

What is JSON-RPC and do i need it?

I have recently finished installing the Bitcoin client. One site i was using to help guide me is called http://www.weusecoins.com/en/. On the mining guide section of that site it says, If you're ...
2
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1answer
89 views

Bitcoin HD Wallet using C#

What packages do I need to use for creating Bitcoin HD Wallet in C# using BIP44? How can I connect to a remote Bitcoin Node to read all the deposit transactions received by various child addresses in ...
2
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1answer
324 views

How to convert PSBT transaction (base64) to raw/serialized (hex) transaction?

Bitcoin Core's CLI has a converttopsbt command used to convert from raw transaction to PSBT transaction but how is it possible to convert from PSBT transaction to raw transaction using Bitcoin Core (...
2
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1answer
62 views

how does merkle root building work for empty array?

It's known that even if no transactions get created, bitcoin still creates a block with empty array of transactions. In this way, I am curious what the merkle root would be. How does bitcoin figure ...
2
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1answer
440 views

Coin selection algorithm

Playing around with Bitcoin Core Client v0.18.0, I used this command: $ bitcoin-cli sendtoaddress "mozazucvLK179u41bF5Vd2Agp4wsm7HsPo" 0.1 which created this transaction. I noticed that the ...
2
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1answer
291 views

What does it mean if TXID and WTXID are the same?

I'm having a tough time understanding what exactly WTXID is and what it means when WTXID and TXID are the same (and vica versa). What I understand is that WTXID includes the witness data. Since non-...
2
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1answer
591 views

C# library for exploring Bitcoin Cash blockchain

Does anyone know of a good C# library which would enable me to explore the Bitcoin Cash blockchain by communicating with my own node? Something like Nethereum (Web3) for Ethereum. Or, alternatively, ...
2
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2answers
673 views

Options for a Client Only C# application

If I want to create a client only, C# desktop application, what are my options for working with Bitcoin? I could try to port BitcoinJ, which seems like a lot of overhead in terms of initial effort ...
2
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1answer
288 views

Who wrote the actual bitcoin software?

Who wrote (and owns) the actual bit coin mining code? If the origins is not crystal clear, it will be very difficult to explain its use to ordinary everyday people.
2
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1answer
1k views

where is default Bitcoin-Qt data directory? [duplicate]

I want to make portable client so I found with start bitcoin-qt.exe -datadir=data But where is default data dir so I can move it there?
2
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2answers
3k views

Is there only ever 1 send address for a wallet

I know you can create label / address pairs to receive coins and also that a wallet automatically generates a new address when you need change from a transaction for the receive operation. Will there ...
2
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2answers
1k views

Can I use current Bitcoin protocol and Bitcoin client to create my own controlled currency?

Since Bitcoin network and Bitcoin currency are not so reliable and can't be controlled. Also, they are open source. How difficult it is to use the current client and protocol to create a new, ...
2
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1answer
292 views

Running multiple bitcoin instances on same server system

I wish to run multiple instances of bitcoind on my server to support highly read intensive RPC applications. Following links: how to run multiple bitcoind node on one server? Running Multiple Full ...
2
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1answer
94 views

In what circumstances would a block appear in the Leveldb .ldb index but have no data in a .dat file?

I've observed this behavior with Bitcoin Core v0.15 while parsing the LevelDB index in .bitcoin/blocks/index. It is also a situation that is obviously accounted for in the Bitcoin Core source code ...
2
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1answer
221 views

Help understanding OP codes on multisig redeem script (hex)

I was reading this gist and am not sure I am understanding/reading the hex of the multisig's redeem script correctly (line 14). It is: ...
2
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1answer
145 views

How to determine the remaining Bitcoin Cash after the hardfork?

This is some thought I had in mind for sometime which I couldn't come up with a proper explanation. Please excuse me if this is a stupid question. I have read the following on few articles on the ...
2
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1answer
2k views

How private key is generated from password in Bitcoin-clients

We all know that private address is a 256bit number. But is the process of converting your password to this 256bit number standard across different clients? I can imagine that a "strong random 40 ...
2
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1answer
338 views

Encrypted bitcoin private key from bitcoin-cli

Hi I need to know the command which is used to generate encrypted bitcoin private key from bitcoin-cli (for a bitcoin address) so in future when that private key is used for import address in any ...
2
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2answers
3k views

How to Get UTXO using bitcore-lib?

I am using this library to make a wallet service that runs on a web browser. I use the library and browserify it so its compatible with the rest of my jquery. Now this tells me how to make and sign a ...
2
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2answers
5k views

How To connect BItcoin Core with Php

i installed a bitcoind core and i access bitcoin-cli command in linux terminal with developer command(getbalance, getaccountaddress etc.) but i want run this command in php file. my php code is: ...
2
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1answer
130 views

How to get the "BTC" abbreviation via command line?

I'm writing a module that connects to multiple wallets at once and I would like to have a way I can simply query the coin daemon for its coins abbreviation (not the "microcoins" as asked in a comment ...

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