Bitcoin Core is an MIT-licenced Qt 4 GUI application for the original Bitcoin codebase. Additional/previous names include "Bitcoin-Qt", "Satoshi-Client", and "Standard Client".

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Have I lost my Bitcoins?

Ill start from the beginning. Im really new to bitcoins so being naive ive jumped in downloaded a wallet (bitcoin core) got my adress and set of buying 1 bitcoin. Now I bought the bitcoin and it all ...
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2answers
25 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 ...
2
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1answer
35 views

Bitcoin Core V 0.10.0: Is there a way to force send when not synchronized?

My Bitcoin Core is not yet synchronized, but I already attempted sending a transaction, so now it is 'conflicted'. I can see this conflicted transaction is not being propagated. Is there a way to ...
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1answer
128 views

What will happen to my bitcoin if both Core and XT remain indefinitely?

I have some bitcoin in wallets and online accounts in multiple places. What will happen to this bitcoin if both Core and XT remain indefinitely? Will I own twice as much bitcoin, just in two different ...
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2answers
197 views

What is the impact of Bitcoin XT fork on current Bitcoin holders?

I was reading that there was disagreement on the block size limit and Bitcoin has been forked to Bitcoin XT? With two different flavors of the software running, which might result in two different ...
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1answer
29 views

Do all Bitcoin client enforce checkpoints?

The core Bitcoin client has a list checkpoints - blocks where it will only accept a particular block header. This means that if someone builds a blockchain with more work that does not include these ...
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1answer
28 views

How to transfer bitcoins from one Currency to Another from Brazil

I want to send money from real BRL to euro EUR. I live in Brazil. How can I use bitcoins for that? And How would I make the bitcoins available for the person to spend in Euros? Thanks.
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1answer
21 views

Trying to send Bitcoins from testnet to my regtest node

I send bitcoin regtest server BTC to other bitcoin address of same server. I sent 5 BTC but it shows 50 BTC of that account's associated address. It received 5 BTC. What's the problem with this ...
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41 views

how to use bitcoind jsonrpc for regtest or testnet server in php?

i used bitcoind with jsonrpc service. but i added regtest=1 in bitcoin.conf at .bitcoin folder. used: bitcoin-cli -regtest generate 101 bitcoin-cli -regtest getbalance 50.00000000 ...
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1answer
29 views

What order does Bitcoin Core place the inputs it spends in?

What order does Bitcoin core place the inputs it spends in? Is it random? Is it sorted by anything? What, if anything, can you tell about the originator of a transaction by the input ordering?
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30 views

How to tell how many hashes/sec the bitcoin core app on osx is running?

I'm curious how many hashes per sec my cpu is able to perform, is there some way to check this? This is a follow-up to this question.
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Please help! How do I transfer my wallet from bitcoin core to MultibitHD?

I (should by now) have bitcoins in my wallet,I sent them to my wallet whilst i was using bitcoin core but after taking days to sync (and it still hasn't synced) i have given up and installed ...
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29 views

!setBlockIndexCandidates.empty()

!setBlockIndexCandidates.empty() Bitcoin Core 0.11 error Hello, I have a problem with the Bitcoin Core v. 0.11 software!!! I installed the software today and after a long wait (downloading block ...
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25 views

Import OLD wallet.dat to new Bitcoin core

i made a wallet.dat backup in an old version of bitcoin qt. The mac where i had wallet is dead. In other mac with the last version of bitcoin core when i try to replace the wallet.dat the app crushes. ...
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1answer
37 views

x , y coordination division

python code def inverse(x, p): return pow(x,p-2,p) p = 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f #private key 2 -->(x , y) value xx = ...
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1answer
42 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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26 views

paytxfee vs maxtxfee which one overrides the other

In wallet options section it shows these two settings -paytxfee=<amt> Fee (in BTC/kB) to add to transactions you send (default: 0.00) -maxtxfee=<amt> Maximum total fees to use in a ...
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1answer
24 views

What was the original rationale for limiting the maximum push size?

The current Bitcoin client filters out any pushes beyond a certain size. static const unsigned int MAX_SCRIPT_ELEMENT_SIZE = 520; // bytes [...] if (vchPushValue.size() > MAX_SCRIPT_ELEMENT_SIZE) ...
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96 views

OS Windows Reinstalled, Bitcoin Core bitcoins lost, how do I recover them?

I've lost my bitcoins when I reinstalled OS on my computer. I still have my receiving address and the password I used to encrypt my Bitcoin Core Wallet. How do I recover the lost bitcoins? Does ...
2
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1answer
61 views

Is it possible to have my blockchain on a different folder than that of my wallet files?

I am trying to implement bitcoin payments for the project I'm currently working on, and I need to create a bitcoin wallet that should be inside a USB stick. This USB stick should be at the hands of ...
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27 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
19 views

Is it possible to execute a CLTV transaction in bitoin core 0.11 console?

The title says it all. How can one perform a op_checklocktimeverify transaction using bitcoin core? I've searched around and I've found a few repo's on github but nothing about how to do it in the ...
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29 views

Bitcoin soft fork hypothetical issue based off BIP66

Recently I saw BIP66 activation occur on testnet, but then the majority of miners were propogating V2 blocks again, causing 0.10 nodes to reject any v2 blocks - causing a fork between V2 and V3 nodes. ...
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116 views

What level of mathematical understanding do I need in order to contribute or to understand the crypto behind bitcoin?

My mathematical knowledge is up to CALC II (college level.) Is this enough mathematical maturity in order to understand the crypto in bitcoin or do I need more knowledge? If I do indeed need more ...
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120 views

Estate planning: how can I ensure my bitcoins are inheritable?

What are good ways to ensure my bitcoins can be inherited by my family when I die or become permanently incapacitated? I think there are probably two significantly different situations to account ...
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42 views

from Bitcoin Core to SPV client

I have a wallet on Bitcoin Core with addresses that are receiving and will receive payments in the future (which I can't change); for this reason I cannot send my bitcoins to a new wallet; that said, ...
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1answer
68 views

Can old wallet.dat (offline long time) still receive money?

I have an old wallet.dat file (from a backup) and no client installed since a very long time. Recently some transactions have been made (BTC have been sent to my address). Will this old wallet.dat ...
2
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1answer
59 views

Is there a difference between “In” and “Out” peer connections?

On bitcoin-qt, some peers are called "Out" and some are "In". Is there any difference besides who initiated the connection?
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63 views

Transaction never confirmed over 2 days [duplicate]

I did a transaction from my bitcoin core wallet. The transaction 6263452f635713e60f83d45fe41b1c9ba3b5f5e3af664778bf18a05b15cfde06 has not confirmed, and it is now over 48 hours since I made the ...
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2answers
75 views

Broadcasting an OP_RETURN transaction

I am facing two problems below, First is that I am trying to broadcast transaction which have OP_RETURN but blockchain.info continuously rejecting it, though I have broadcast it using bitcoind. ...
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3answers
164 views

Why does bitcoin core need to download the blockchain

I understand that the blockchain is what keeps track of who has what coins and makes sure that everything is correct and secure, but why do I have to download it? Isn't that where the miners come in? ...
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40 views

How can I regain coins on a device with insufficient memory to fully synchronize?

I have started syncing the blocks and didn't know how much room was need, I am about 40 gb through and my device is full. I already have money on the account, but it isn't synced far enough to send ...
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39 views

Send and Receive Bitcoin - development

How to develop send and receive bitcoin using coinbase api, i need to use in java. i tried the sample from https://github.com/coinbase/coinbase-java by using readme.md instruction. but facing issue. ...
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bitcoin-qt restored wallet.dat all synced closes after correct passphrase “assertion error crypt” HELP

Installed bitcoin-qt and replaced new wallet.dat with old wallet.dat backup Opened bitcoin-qt and let it sync and all blocks synced and wallet has correct funds and past transactions. I Want to ...
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33 views

How does Bitcoin Core sort memory pool transactions by fee?

I'm trying to understand the algorithm Bitcoin Core uses to sort memory pool transactions by fee. Gavin's fee rework proposal states: Next, sort all remaining memory pool transactions by ...
4
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1answer
46 views

Bitcoin Client crashing while syncing

I am getting this problem today: when syncing, the client suddenly crashes with the following debug.log: ..... 2015-06-29 14:30:34 IO error: ...
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2answers
50 views

Ubuntu. (blockchain of version 0.9.3 compatible with 0.10.1?)

I have version 0.9.3 of bitcoind on my Ubuntu server and I want to upgrade to 0.10.1, I have nothing in my wallet. Does the blockchain 0.9.3 compatible with 0.10.1? Do I have anything to keep from ...
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2answers
62 views

Compact integer in Scripts

I've been looking at the compact representation of integers for integer operations in the Script language. It seems that most operations produce or push byte arrays, but when integer operations are ...
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1answer
78 views

Import two wallet.dat into Bitcoin-Qt client

This is very closely related to Import wallet.dat into a new Bitcoin-Qt client, but I feel this is not a duplicate because the (great) answer to that Q is for only restoring one wallet. I used ...
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28 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 ?
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Meta-Mining: Can mining exist in abstract states?

Has anyone here explored or pondered possibilities for meta-mining? Theoretically, you could have miners work on any computational problem, and then have rewards handed out proportionally as part of ...
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Bitcoind writes complete wallet.dat regularly which is a problem, what can i do?

i have troubles with my system, using iotop i identified bitcoind as the source of problems. I am running bitcoind of bitcoin-0.10.0-linux32 and am using the RPC calls of bitcoind. My wallet file is ...
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1answer
94 views

Bitcoin Core cannot obtain lock

I downloaded Bitcoin Core (64 bit) and I am still waiting for it to synchronize. But just now, when I open the software, it loads from 1% to 100% and then a message appears with the inscription ...
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3answers
142 views

bitcoin core 0.10.1 upgrade stuck syncing

I just upgraded from Bitcoin Core 0.9 to 0.10.1 on Ubuntu 14.4 after being gone for a few months (blockchain data is from February). When I loaded up bitcoin-qt, it seemed to be working fine and ...
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36 views

how do I send my imported wallet on electrum

I have been able to transfer my bitcoin to electrum but am facing hard time to pay it or send my coins. A form appear and I fill out and there is only two option to choose to click create unsigned ...
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1answer
107 views

How much disk space do I need to run Bitcoin Core with txindex on?

Currently the blockchain is at 36 GB, but with txindex turn on, how big is it? And how much disk space should I get to run a Bitcoin Core node with txindex on for say a year?
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100 views

Mempool tracking

I'm trying to clear up some uncertainties around the mempool A tx comes in, its validated, and no other transactions have currently marked any of its inputs. Tx gets added to mempool. If a double ...
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8k views

Should I be running Bitcoin Core or Bitcoin-XT?

I just read about Bitcoin Core and Bitcoin-XT, and I want to know what is the difference between Bitcoin Core and Bitcoin-XT? And which is better Bitcoin Core or Bitcoin-XT?
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93 views

Dynamic coinbase as incentive to fill blocks

Miners do not currently have a monetary incentive to fill up blocks with transactions (tx fees are negligible compared to the coinbase tx). Those miners that do fill up the blocks may do so with the ...
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1answer
40 views

How to check Bitcoin payments received or not

I am creating a software and i want to take anonymous payments through bitcoins and once the payment is received to my bitcoin address then the user get serial key of that software... so How i can ...