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.

learn more… | top users | synonyms (1)

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permanent address

How can I set a permanent address wallets to send and receive? How can I find out in advance which address the coins will be sent? We have a community in MLM that pays membership of the coins. Upon ...
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How to upgrade my node with bitcoin wallet GUI from 0.11.2 to 0.12.1? Install qt V5.5?

i want update my RaspNode (rPi 2 B+) to the 0.12.1 but i want to use Bitcoin wallet GUI. So, it's necessary to install QT V 5.5... V 0.11.2 use QT 4.8, but 0.12.1 uses QT V 5.5 How to install QT V ...
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73 views

Multibit HD Wallet Stuck For Days (Unconfirmed)

So MultiBit HD Wallet has been stuck for days and it's killing me. I've repaired the wallet numerous times but no luck. How can I proceed? 2nd time in the last week this has happened.. last time I was ...
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47 views

one time pad using blockchain

I am thinking if secure encryption like one time pad (OTP) is achievable using bitcoin blockchain? The reason is bitcoin blockchain size is over 70 GB, which could potentially encrypt/decrypt 70 GB ...
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66 views

What is 500K in Bitcoin?

Many times I see something like this 500K or 2Bytes. What are those in bitcoin and how can I calculate them. Sorry for this noob question ;)
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67 views

Create raw transaction in python

I have a private key (raw + WIF) and I want to send all funds from that address - fee to another address. Is there a raw python function that can do that for me ? I will broadcast the tx manually. ...
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27 views

AddPortMapping fails with error 904

Without additional words, here's logs: ************************ EXCEPTION: NSt8ios_base7failureE CAutoFile::write: write failed bitcoin in ProcessMessages() 2016-03-05 00:15:31 ...
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101 views

Why did Bitcoin Core wallet send my coins to this address?

Yesterday evening I installed the Bitcoin Core wallet (v0.11.2 (64-bit) from the Chocolatey repo to my Windows 10 machine). I had some coins in an old wallet.dat that I copied to the data directory. ...
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36 views

Electrum - Setting up a server - Problems!

So im trying to request payment through my website but having problems. Im using Windows 7 x32 as a testing environment. I installed Electrum via the installer and not the standalone exe. First ...
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2answers
61 views

How does restoring an HD wallet work?

I was trying to learn working of bitcoin and trying to understand the working of bitcoin wallet. I can see the behavior of how an HD wallet starts with an address and adds additional addresses later ...
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2answers
88 views

Electrum wallet giving dust error even for larger amount

I have used this wallet sever times before to send or receive. I closed, downloaded and tried again to send to multiple addresses. Error message: http://imgur.com/Om2Dqyi
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46 views

I am trying to see the Block chain of twister

I am trying to parse the blk00000.bat file in my Ubuntu system . I am following the this document for help https://www.cryptocoinsnews.com/block-parser-how-read-bitcoin-block-chain/ . When i run the ...
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43 views

What is the correct code flow while sending a message

I have a fundamental doubt wrt boost signaling used in bitcoin. As far as I understand the following happens between main.cpp and init.cpp: StartNode() spawns a thread ThreadMessageHandler ...
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47 views

Why isnt a random port chosen for SEED node sockets?

I connected a node A to bitcoin testnet (Port 18333). The node discovery happens and I see couple of connections between my node A and the seed nodes. All of the sending and receiving happens between ...
3
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1answer
167 views

Able to send 0.2BTC from old to new wallet w/o fee as of 2016?

Good evening everyone. I've been out of the cryptocurrency scene for a couple of years and I've stumbled into a minor issue. I've been trying to figure out if it will be viable to move some Bitcoin ...
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1answer
74 views

Why does ONLY some connections have 'addrlocal' in getpeerinfo output

I connected two laptops A and B to bitcoin testnet. I then manually connected B to A using addnode of bitcoin-client. Snippet of getpeerinfo from B: { "id": 1, "addr": ...
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18 views

Help with understanding Semaphore grants in OpenNetworkConnection

I am new to concurrent programming. Can any expert throw some light on the semaphore grant that one requires before acquiring a network connection ? bool OpenNetworkConnection(const CAddress& ...
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33 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 ...
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91 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) { ...
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1answer
497 views

Solo mining without a pool?

Is it necessary to run a "full node" including port forwarding in order to solo mine Bitcoin without any involvement of a pool? I see that pools are offering solo mining as an option, but why would I ...
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22 views

SPV client unconfirmed transaction handling

Do SPV wallets do any validation for unconfirmed transactions like checking for DER encoding or low-S signatures? Or do they rely entirely on a full nodes mempool?
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1answer
86 views

What does event_base_dispatch do?

Source code (src/httpserver.cpp): static void ThreadHTTP(struct event_base* base, struct evhttp* http) { RenameThread("bitcoin-http"); LogPrint("http", "Entering http event loop\n"); ...
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1answer
64 views

How to connect bitcoind mainnet node on AWS EC2 by using rpcjson?

I'd like to access bitocind mainnet node on AWS EC2 from ruby. I've written as follows using rpcjson, however it cannot connect, then returned the error client = RPC::JSON::Client.new ...
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27 views

Help with understanding HTTP Server logic in bitcoin

I am new to bitcoin source code and libevent in cpp. Can any expert help me with understanding the overall flow of how HTTP session is getting created say once I trigger a bitcoind from terminal? The ...
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1answer
101 views

How to send btc from the specific address using bitcoin api?

I'd like to send bitcoin from the specific address to a address using bitcoin api. I used 'sendfrom' as follows. Each address "mqXhhivMPjeVvdVMR239EVDJiRGQUYcbDZ" and ...
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80 views

Coinbase API: Create bitcoin wallet for app registered users

I am a PHP newbie. I want to develop a web app to store,send,retrieve bitcoins. I need to create wallet for each users. Our idea is to use any online wallet service such as blockchain.info or ...
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1answer
34 views

Does Bitcoin ensure all messages will be broadcast?

Since Bitcoin is largely a flooding-based P2P network it means that any message it receives on one of its connections also needs to be routed to all of its other connections. This means that by ...
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1answer
76 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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2answers
89 views

Desktop Client Recomendation [closed]

can you recommend me any desktop clients ? So far I have tried bitcoin-core, Electrum and MultiBit. I liked Bitcoin Core, but as the blocks increase, it becomes extremely heavy. In my computer, it ...
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91 views

How to develop an ownership tracking service based on bitcoin blockchain

Now I expect to develop an ownership tracking service like Ascribe. I'm planning to develop it as following, however I am not sure whether my plan is correct. Therefore, please let me ask two ...
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75 views

Best backend wallet for web service

The website I am working on needs to have a web wallet integrated. What is the best solution for for a back end web wallet? I need something that the web site can interface with to be able to ...
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75 views

Bitcoin wallet plugin for WordPress

I have looked for but cannot find a Bitcoin wallet plugin for WP (WordPress). I want to create a WP site with a built in wallet for use on the site. You will be able be able to use the built in wallet ...
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1answer
87 views

bitcoin payment accidentally sent to Bitcoin-Qt application's sending address

My father accidentally sent a bitcoin payment to his Bitcoin-Qt application's "sending address". Are the bitcoins lost? or is it possible to recover them somehow? When checking on blockchain.info, the ...
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274 views

Conflicting transaction in memory pool

A conflicting transaction has been detected in our memory pool. The transaction hash displayed below may change. ...
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203 views

Bitcoin transaction broadcast

I am bit confused about transaction broadcast on the internet.How does a miner know a transaction has been broadcasted? The internet network is very huge.Or how does my bitcoin client collects the ...
4
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1answer
73 views

Based on a certain amount of addresses, is it possible to find out how many bitcoins a specific wallet includes/owns?

Based on a certain amount of addresses, is it possible to find out how many bitcoins a specific wallet includes/owns? E.g. I have a blockchain.info wallet. If I create 1000 bitcoin addresses, fill ...
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2answers
66 views

Bitcoin physical monetary equivalent

I've never really given it a thought till now, but do bitcoins have a guaranteed value in gold similar to physical currency(banknotes/coins)? As far as I know, the value of a currency is guaranteed ...
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41 views

Where does the current Bitcoin Core currently fail static analysis, if at all?

I am looking into static analysis, and I'd like to know what to expect in the case of Bitcoin's main implementation, Bitcoin-Core. That way, if I try static analysis on Bitcoin, I will know whether ...
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108 views

publicly available json-rpc node for bitcoin-cli connection

There is a service provided by blockchain.info described on json_rpc_api page. More or less it describes the API that user can use to access their blockchain similar way as using bitcoin-cli to own ...
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2answers
106 views

bitcoind and bitcoin-cli 'unrecognized', how can I access them from command line?

I have downloaded and installed the precompiled Bitcoin Core OS-X (also successfully synchronized). Every tutorial I have seen then directs one to begin using the executables bitcoind and ...
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1answer
81 views

How can I get the Fee involved in a Bitcoin transaction using RPC client (bitcoin-cli)?

I performed a bitcoin payment in the testnet, here is what I get when I execute bitcoin-cli gettransaction "11b8d5f89793e83e9e10b7ee51fa1b3445f6029f7d7efe4c82b3b261ec513a0e", as you can see the info ...
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1answer
35 views

Can a client leave its mark on the blockchain?

Would it be possible for a client (eg the core client) to leave its mark in the form of META data on the blockchain or even in the mempool so that we know that this client was used to create or send ...
2
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1answer
57 views

Why does an exchange of bitcoin transaction not need to be over a secure connection?

I apologise for my rather ignorant question and maybe my question is completely wrong. But my impression about one of the advantages of bitcoin (digital currencies) is that when a customer pays a ...
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1answer
60 views

How can one figure out what version of Bitcoin-Core is used most?

Where can one find statistics on how many nodes are running older Bitcoin Core versions or alternative clients?
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22 views

How can I start to mine? [duplicate]

I want to begin to mine on a computer, I know that it is not efficient but I want to do some experiments and tests for a project. I tried all programs in the list ...
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1answer
27 views

how to capture only one part of the getrawtransaction

I want to capture just one part of what Getrawtransaction returns, but it returns an array within an array that i can't seem to process. I.e when $txid = ...
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53 views

listtransactions returning duplicate transactions with category “Send” & “Received” both

I am facing serious problem in listtransactions call. I am getting duplicate transactions with "send" and "Received" category. For I have sent some bitcoins from 31zeoskE8zeyQARFEVzwJzsp7GQpLn5zhF to ...
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1answer
84 views

Why new public key for every new request?

I created Bitcoin accounts using different clients but all clients I tried prompt for new public key for each request. My question is shouldn't be the public key one's identity which one should be ...
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47 views

where can I download the blockchain nightlies handled by tcatm? [duplicate]

I want to download the blockchain nightlies handled by tcatm, yet the site seems down. Is there any alternative site? Thank you
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42 views

Bitcoin core 64 bit has freezed

I downloaded bitcoin core 64 bit and it was synchronizing. I turn my laptop off and open the program again and now it frozen at " loading block index " . I have bitcoins on it. What should I do now ?