0
votes
1answer
4 views

Transfer different currencies between wallets

I had SCOTCOIN in a counterwallet.io address and I transferred it to a Coinbase BTC wallet. I wouldn't have thought the transaction would have worked but it did. The amount of BTC in the Coinbase ...
0
votes
1answer
12 views

Is there any way for me to recover or reclaim a confirmed but unspent transaction that was sent to the wrong address?

I sent money to the wrong address. I am not a developer and I only understand the blockchain in its most general terms.....but I use bitcoin everyday so I have a working knowledge of it. It's hard for ...
0
votes
0answers
11 views

Send BTC with attachment using BitcoinJ

is there an example of how using BitcoinJ send BTC with an attachment? Lets say I want to write to blockchain "Vaclav Bilek Born 1991". If I understand it correctly, its just about sending minimum ...
4
votes
2answers
1k views

Who mined the infamous block 364422?

Block 364422 contains a transaction that takes a long time to verify. This transaction design demonstrates a way a denial of service attack could be executed. This prompted Gavin Andresen to propose ...
0
votes
1answer
13 views

Mining: then whose benifit from mining?

After reading many articles, I didn't found the answer: "miners use special software to solve math problems" ok, but for who? is there organizations, personas that needs those math problems to be ...
1
vote
0answers
7 views

Antmain s3 wireless?

Antmain s3 have an antenna. Does it mean you can mine wirelessly? If yes, can you give me an instruction, I would highly appreciated.
1
vote
0answers
13 views

Unspent BTC that won't go through

My transaction won't confirm. Is there a way can I get my coins back? I have been waiting over 24 hours. There isn't any options available from my block chain wallet.
0
votes
1answer
13 views

Can you reset 'used' addresses that were actually never used?

Bitcoin RPC command getnewaddress returns a P2PKH address from the keypool, and marks it as "used" so it will not be returned by the same RPC call again. I'm going to be doing a lot of testing on ...
0
votes
1answer
13 views

Restore a wallet from an external drive?

I have an external drive where at some point I did a complete backup of my (linux) home directory. There's a directory .bitcoin. I now have a computer, and I just installed bitcoin-qt and other ...
0
votes
1answer
10 views

storing bitcoin's database directory on an external drive?

I have a new-ish powerful laptop with SSD, limited to 128GB. It came with a RAID which somehow didn't work for installing linux, so I had to disable the RAID and now I have actually two 64GB disks ...
0
votes
1answer
10 views

BTC transaction issues [on hold]

Respectfully requesting to look into this transaction. Did it got confirmed or not? is been 5 days now. Thanks 18MJieFJcDiFbAsvSxe5iCaBAYsikgJta6
4
votes
5answers
424 views

How one checks which customer made a payment

One question I'm not able to properly answer when asked is How exactly the blockchain can verify the identity of the user without a centralized trusted party such as VeriSign? I know this is ...
2
votes
2answers
21 views

Is there any wallet that allows safely storing private keys in an offline computer?

I have a computer that is 100% disconnected from the internet. I'd like to: Generate my own private keys by dice rolls; Import them on the offline computer wallet; Send coins to their addresses; ...
2
votes
1answer
15 views

How do I still have connections without forwarding port 8333?

First of all, this isn't a problem I am having, I'm just curious how this works. If you run your node with port 8333 open, you'll receive a large amount of connections after being online for a ...
0
votes
0answers
10 views

What blockchain (or similar technologies) allow for “splitting” the network, offline?

There were a few ideas on how to make the blockchain hierarchical, and also splitting it to allow for splits. Are there any proposed/non implemented ideas that accomplish this with Bitcoin or any ...
1
vote
0answers
30 views

Bitcoin faucet changes Bitcoin address of users - could this be malware?

I'm running a Bitcoin faucet and lately I've been getting complaints from several users that the BTC address that is auto populated in the address bar is not their own. I auto populate a user's BTC ...
1
vote
0answers
15 views

Wallet loses the money to be restored in bitcoinj

I have a problem when using the library bitcoinj. When I restore a wallet from a backup, if it has received money in some of his addresses to synchronize with the blockchain, the money does not ...
0
votes
1answer
90 views

Are there Ethereum API wrappers? [on hold]

I'm looking into developing some Go software on Ethereum and I'm wondering - are there any API wrappers around for Ethereum (something like BTCSuite's BTCRPCClient is for Bitcoin)? I know there is a ...
0
votes
1answer
19 views

How do I move my wallet from Windows 7 to a new Windows 10 machine?

Previous answers say set up a new wallet with new address and transfer bitcoins to new address, is this the only way of doing it? I don't want to wait days for the new wallet to download blockchain ...
2
votes
1answer
16 views

Is it possible to exploit the use of the same private keys on different crypto coins?

Suppose someone has single private key, and from that private key he made a public key for Bitcoin, Ethereum, Dogecoin, etc. - is it possible to figure out the private key having those multiple public ...
1
vote
1answer
19 views

libudev error while configuring cgminer on fedora 22

I am using Fedora 22, 32bit OS and have Antminer U3 for mining operations got the cgminer source code from GIT: git clone https://github.com/bitmaintech/cgminer while running ./configure ...
-2
votes
0answers
8 views

withdraw cash from ATMs with the bitcoin balance

the websites like e-coin are credibles ? we really can withdraw cash from ATMs with our bitcoin balance ? if not what are the most credible websites ? thanks in advance
1
vote
0answers
21 views

I imported my private key into blockchain.info but it says 'no free outputs to spend'?

After two days of researching I finally got my private key! However when I import it in Blockchain, it says 'no free outputs to spend'. How do I fix this?
0
votes
1answer
11 views

Bitcoin-qt bitcoin.conf location?

I have Bitcoin-qt installed and running on an external Hard Drive. Where should I put the bitcoin.conf file so I can configure it with the server setting, user, and password?
4
votes
2answers
39 views

Why can't we switch private and public keys?

If private and public keys are performing the same task (although asymmetrically), but I mean each one can encrypt something that only the other one can decrypt, can I create a paper wallet and share ...
1
vote
0answers
14 views

calculate transaction fee in a block

I want to know how one can query bitcoin core via json rpc or other methods to find all the transaction fees in a block? API queries are not useful as they have a rate limit. Here is an example ...
1
vote
2answers
42 views

Block size depending on transaction count

It's widely known that Bitcoin has a limit of 1 MB per block. However, the average block size is currently about 0.6 MB: (original data) According to this thread, Bitcoin transactions has an ...
-1
votes
0answers
38 views

I rest my computer

I reset my computer and lost my bitcoins that were attached to chrome extention called Kryptokwallet what do I do get find my bitcoin
0
votes
0answers
4 views

What power cord to use with BITMAIN PSU?

As I introduced in my previous question which no one answered I'm having some problems with bitmain's power cord So the simple main question is what power cord to use ?? I used a 250v 10-16A ...
1
vote
1answer
33 views

Why does my Antminer S7 power down right after startup?

Before asking the question I'll better introduce what I am doing: I have: Antminer S7 (Bought from BitMain) BitMain PSU (Bought from BitMain) 220V & 10-16A & 3*0.75mm^2 Power Cord for the ...
1
vote
1answer
18 views

How to add coinbase transaction with libblkmaker

I currently trying to develop a simple Bitcoin miner in c++ for a project on my university. For parsing the 'getblocktemplate'-data I'm using libblkmaker. Now I have to build the coinbase transaction ...
2
votes
1answer
18 views

Why do we need CCoins in addition to CTransactions?

As per my understanding CTransactions represents the atomic unit in Bitcoin. It has the inputs CTxIn and outputs CTxOut. Can any expert give the intuition of why we need CCoins in source code ? Why ...
0
votes
0answers
9 views

easybitcoin sendfrom not working to errors

When I try to send bitcoins via move or sendfrom nothing happends, I dont het any errors. I use a very simple script: try { $_SESSION['message'] = $bitcoin->sendfrom($_COOKIE['login_user'], ...
0
votes
0answers
17 views

Looking for best mining hardware (price / performance ratio, etc.) as of Jan 2016 [on hold]

Starting from scratch with about $12 to $14K US and am looking for best mining hardware (price / performance ratio, etc.) as of Jan 2016 - - read a little about merged mining and am not clear about ...
1
vote
0answers
13 views

'QtPrintSupport/QPrinter' file not found, Dogecoin gitian build for OSX

Building a Dogecoin based Altcoin, forked right around Dogecoin 1.8.3-dev. Here's the error: ... CXX libaricoinqt_a-addresstablemodel.o utilitydialog.cpp:45:10: fatal error: ...
0
votes
0answers
11 views

Which altcoins have implemented a brain wallet that uses Warp Wallets functionality using scrypt for hashing? [closed]

Bitcoin has warp-wallet for generating a more secure brain wallet, but has any other altcoins used the same functionality in warp wallet for generating their brain wallets?
0
votes
0answers
20 views

What does it mean? [duplicate]

https://blockchain.info/ru/block/00000000000000000233ba0eca74198e0152b91c75d082d6240497b2bacd0aa9 https://blockchain.info/ru/block/000000000000000001879f26997dbc9e69c6edffc144ea5d2eda3d802f200919 ...
2
votes
1answer
28 views

Do the leading zeros in the desired hash pattern for mining change?

If I understood it well, miners collect transactions in temporary files on which they apply a cryptographic function. The result will be reviewed against a desired pattern. Does this "desired ...
-4
votes
0answers
17 views

Participants needed for online PhD Study into BitCoin Usage [closed]

Is Bitcoin a boon for the criminal or disruptive power for good? Is it done or do you foresee a rosy future for the cryptocurrency? At Security Lancaster we are undertaking a large study into ...
1
vote
0answers
12 views

Change the fee on Multibit

The transactions-fee is set to 0.0001 btc in Multibit classic. Can I set the fee to 0.2 or 0.3 mBTC? Where is the java class that I must change to upgrade the fee? What is the var or const to change?
0
votes
1answer
60 views

How do I get my public address in Bitcoin Core?

In a world of pain at the moment. I downloaded Bitcoin Core, and before I realised I'd need the complete downloaded Blockchain, my friend transferred some coins to my address. I did some research ...
-1
votes
0answers
46 views

crypto mining with an old graphics card

I have a high end gaming computer that I would like to use for mining, but I don't to do any damage to the graphics card. I end up getting an old gtx 285 BfG with one gig for free. The problem is that ...
1
vote
2answers
36 views
2
votes
1answer
46 views

Can wallet created from Bitcoin core be transferred to an Android device?

I worry that if I install a wallet in my Phone, it would have a different wallet from the one I created in PC.
1
vote
2answers
51 views

Find private key

I have 2 transactions. ...
1
vote
1answer
25 views

Reject TXs based on fee in comparison to TX size?

Is it possible to configure a node to reject junk transactions like this https://tradeblock.com/bitcoin/tx/6d67480fde2dd484b0ee389a6488db212ea7d0dbd2a11358efcc0b39077407ca 199 inputs, 35kb tx with a ...
-1
votes
1answer
34 views

How do I purchase Bitcoins? [duplicate]

Way too complex. Give me an actual example as to how this works? For example; How do I purchase bitcoins? How much do they cost; is there an exchange rate? How do I redeem them; turn them back into ...
1
vote
1answer
21 views

Connect a mobile client to wallet on remote Bitcoin Core

I run a Bitcoin Core node on my computer and have a Windows tablet. My wallet is on the computer and I want to keep it there. Is there a way to have my tablet create a new Bitcoin address for my ...
2
votes
2answers
41 views

Halving reward, price effects? [duplicate]

What is the case after halving reward takes place: Would bitcoin price gets double, since its harder to mine? Would Blockchain introduces more blocks (e.g: 1/5mins)?
0
votes
0answers
17 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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