2
votes
1answer
46 views

Bitcoind blocks fell behind sometimes

I ran 6 or 7 bitcoinds with version 0.93 on CentOs. I used the default configuration on all of them. Sometimes I found one or two fell behind the others. And I need restart them, then they would work. ...
1
vote
0answers
49 views

Ripple: only a sub-network reaching a consensus is largely enough to be decentralized&secure system?

I spent a while reading ripple protocol, specially the consensus process, the protocol works based only on a sub-network ( from a huge network) reaching a consensus for the current state, it's ...
3
votes
2answers
33 views

Which bitcoin script forms should be detected when tracking wallet balance?

I am implementing a library for tracking wallet balance of given bitcoin addresses. How should the transaction output script be parsed to find if the output belongs to the given address? Is it dirty ...
1
vote
1answer
39 views

Why bother having limitations on Bitcoin Coinbase Transaction Scriptsigs?

There are a few limitations on the structure of the coinbase (reward) transaction in a block. There is only one input. vin.size() == 1 (source) It doesn't reference any previous output. ...
1
vote
1answer
38 views

bitcoin-cli fails with auth error

I run it like the below. bitcoind -datadir=/Users/varunvb/Downloads -conf=/Users/varunvb/Downloads/bitcoin.conf -daemon When I run (Using the user name and password as in the config file) ...
5
votes
5answers
727 views

Energy consumption while mining

I am new to Bitcoin and I read some article about bitcoins and Most articles says "When using CPUs, GPUs, or even the older ASICs, the cost of energy consumption is greater than the revenue ...
2
votes
1answer
41 views

Is it chain of headers rather than a chain of blocks?

We know widely used explanation of the blockchain: "Every block contains a hash of the previous block". The sentence above implies that since every block contains a hash of the previous block, ...
0
votes
0answers
10 views

Selling shares in bitcoin pools [duplicate]

What is the system that prevents that a miner "sell" the same share that he has found to many different bitcoin pools. And another question is, if while mining to find shares he happens to find a ...
2
votes
1answer
28 views

Is it likely that side-chain support will be added to Bitcoin?

Is it likely that side-chain support will be added to Bitcoin? As I understand it, side-chain support will require a hard fork to Bitcoin to support this functionality: "moving" BTC to external ...
1
vote
0answers
19 views

Can anyone give me some help editing the Abe html?

I've got Abe running, but would really like to get the page looking nicer. I've managed to change the logo, but would like to change the title and change some colours and fonts, maybe add some more ...
0
votes
1answer
51 views

How do you delete an account in Bitcoin Core?

I am attempting to allow multiple bitcoin addresses to be created per account, but how can I delete them using the standard API? There doesn't seem to be a function for that. E.g. the acccount "Test" ...
2
votes
1answer
78 views

why is bitcoind is missing from /usr/local/bin?

i just followed the instructions from degreesof zero built, made and installed bitcoind, but bitcoind was missing from the location above. What's wrong with the procedures please? thanks ...
0
votes
1answer
35 views

bitcoind stops working

I have an Ubuntu 14.04 512Mb RAM/100Gb HDD server which I use to host a remote bitcoin node. bitcoind currently catches up and for some reason it just stops working after 10-20 minutes or so every ...
1
vote
1answer
28 views

How to recover a deterministic wallet offline?

I know that in the case of electrum there is a gap limit and it will keep generating addresses until it finds a number of consecutive empty addresses equal to the gap limit. What about if I want to ...
2
votes
1answer
38 views

Why does Bitcoin use separate change addresses?

When you create a wallet, it creates one bitcoin address, correct? When I send funds, it sends all my funds; the person I sent it to gets what I sent, and the change from the transaction is sent to a ...
2
votes
1answer
87 views

How come importing the bootstrap.dat to Bitcoin Core takes so long?

So I downloaded and installed BitCoin Core X64 v0.9.3 from https://bitcoin.org/en/download. I then downloaded the linked bootstrap.dat torrent and after it downloaded the bootstrap.dat, I moved it ...
-1
votes
1answer
104 views

Can you make a profit mining with CPU/GPU? [duplicate]

A Radeon HD 7950 has the fallowing hash rates: Around 600 MH/s for Bitcoin Around 600 KH/s for Litecoin I used this calculator https://bitcoinwisdom.com/bitcoin/difficulty ... so I would get : ...
3
votes
0answers
32 views

What could be the reason for one loop being significantly more power hungry on an SP20?

One of the loops on my Spondoolies SP20 is misbehaving. I underclocked everything but this loop (number 4) does not seem to care what settings I make. It seems to be running at twice the speed (and ...
1
vote
1answer
42 views

How do you determine 'magic byte' or version for alt coins?

I'm looking at creating a deterministic wallet for some of the less popular altcoins. Bitcoin has a magic byte of '0488b21e' and litecoin '019da462'. How are these determined or calculated? Also how ...
1
vote
1answer
40 views

What exactly happens when a node detects a double spend?

Does the node drop both transactions? Does the node choose which one to keep? What exactly happens? Will both transactions be rejected by the network or will one of them be eventually accepted?
3
votes
2answers
120 views

Are Bitcoin ASICs Optimized for Fixed Length Messages?

Bitcoin block headers are 80 bytes. int32_t nVersion; // 4 bytes uint256 hashPrevBlock; // 32 bytes uint256 hashMerkleRoot; // 32 bytes uint32_t nTime; // 4 bytes uint32_t nBits; ...
0
votes
0answers
11 views

Can you know if different adress are from the same wallet? [duplicate]

I'm using multibit, and I generated 7 request adresses. If I were to anonymously give 2 adresses to someone (not the same day) would he be able to know that those two adresses point to the same ...
5
votes
2answers
298 views

Proving a transaction is mine

As an assignment in a digital security course, a group of 100 students was asked to transfer a small amount in bitcoins to a certain wallet. They promised they'd buy something for us from this money. ...
-1
votes
0answers
12 views

What happen if government want to destroy bitcoin [duplicate]

For example if government try to suddenly add enough computing power with additional of 50% more than the current computing power just to destabilised it and make distrust on the public towards ...
1
vote
1answer
32 views

c# BitcoinLib: GetRawTransaction verbose=1 does not work

I want to find out confirmation number for non-wallet transaction. When I use ...
0
votes
0answers
61 views

Get work on custom solo mining software

I'm making a bitcoin solo miner, what is the URL to get the current block header a with JSON call? I also need the URL where the work will be sent if a valid solution is found. Right now I'm trying ...
-2
votes
0answers
37 views

Can Bitcoin be used to launder dirty cash? [duplicate]

There are so many cryptocurrencies these days, and they would seem to offer a likely way to launder dirty cash. All one would have to do, is find a seller who wishes to sell bitcoins for cash, e.g. ...
2
votes
0answers
43 views

Are there any math contests paid in Bitcoin?

Are there any hard math problems or math contests that have rewards paid in Bitcoin?
2
votes
1answer
37 views

How did Coinbase monitor BTC transactions?

I've been seeing a lot of articles like this one claiming that Coinbase has been suspending users that transmit and receive BTCs from sites that provide objectionable goods and services (e.g. drug ...
1
vote
1answer
55 views

What transactions will be included in the next block?

The miners decide whether a transaction will be included in the block. What information do miners have about unconfirmed transactions? How can I know, in detail, what transactions are going to be ...
-1
votes
0answers
62 views

Please help me access my coins [closed]

Where should I go / which wallet should I use, if I cannot get into my Hive wallet? Which BIP32/BIP39 wallet can I use to access my btc? I have my 12 word passphrase, but nothing works with Hive.
2
votes
1answer
47 views

Creating your own Bitcoin price ticker

Say that you wanted to build your own Bitcoin price ticker from scratch, and not rely on other tickers; how would you go about that? What variables would come in to play? How would you gauge the ...
3
votes
1answer
65 views

What happens to my outgoing txs in a block reorganization?

Let's assume I create and send a series of txs: |------block A--------|------block B----------|----block C-----|----block D-----| ...
2
votes
2answers
54 views

How does ShapeShift operate on 0-1 confirmations

ShapeShift can exchange user's crypto currency almost instantly. They state that most transactions don't require any confirmations: Small deposits are processed with zero confirmations. Larger ...
8
votes
3answers
1k views

Can a wallet deny payments to it?

Once my public wallet address is known, is there anyway to deny payments to that wallet? For example, if I want an external authority to regulate who can pay into a wallet, is that possible? I ...
2
votes
2answers
62 views

Blockchain for internet-of-things or is there any mining algorithm that can be utilized in low-computational power devices preserving security?

Recently IBM and Microsoft showed their interest (IBM post, Microsoft post) in utilization of blockchain for internet of things development. Let's assume that in close future the blockchain technique ...
1
vote
1answer
67 views

Bitcoind suspend when Synchronizing blocks

My bitcoind started synchronising blocks. The bitcoind version is 0.93. When the bitcoind found an orphan blocks in the synchronising process, it seems stop and did not work. the message from the log ...
2
votes
1answer
113 views

What happens if a miner confirms their own double spend?

Suppose an attacker makes a double-spend and controls the mining pool that happens to find the good which confirms the transactions. What happens? I suppose the network hopes that a vigilante sees ...
2
votes
1answer
52 views

Can miners choose which transactions to mine?

I'm curious if miners can choose which transactions to mine? I know that there are limits to the minimum size of a transaction fee (around 5400 satoshis) but I'm wondering if miners can ignore those ...
-1
votes
0answers
13 views

Dollar Balance in wallet blank but shows correct BTC [duplicate]

A few days ago I opened my Multibit wallet and where the CDN Dollar Balance usually shows in wallet is totally blank, but wallet still shows 0.2097 BTC. The box at the top called "LAST" which used to ...
4
votes
4answers
3k views

Did I just create counterfeit bitcoins?

I had 3 Bitcoins stored on my PC and I had a backup image of my PC. I restored my PC on another computer from the image and I had 3 Bitcoins on that computer also. I spent 5 Bitcoins as a test, and it ...
1
vote
1answer
279 views

How do miners receive transaction fees?

I know that in a transaction, the difference between the amount and the sum of the outputs is the implicit transaction fee, but how do the miners that verify the block containing that transaction ...
2
votes
2answers
45 views

Is Bitcoin a mesh network?

Considering following definition, can we say that bitcoin is a mesh network? A mesh network uses a network topology in which each node (called a mesh node) relays data for the network. All ...
0
votes
1answer
47 views

How do we verify the signature on a raw transaction using Bitcoinj?

I managed to create a raw tx using Bitcoinj but not able to figure out how to verify its signatures. Assuming I know the addresses corresponding to the (supposedly) unspent outputs used as inputs to ...
0
votes
4answers
91 views

What programming language should I learn to create a new altcoin?

I've been wondering. What programming language is needed to develop and maintain an altcoin? Because I've been thinking to try creating my own altcoin. I've seen a lot of services to develop an ...
1
vote
2answers
41 views

“value” field in raw transaction: Rounded Bitcoins (float) or Satoshis?

I am getting confused about the Bitcoin amount presentation in a raw transaction's "value" field. If i want to spend 0.05 BTC, for instance, which of these is the correct value? "value" : 0.05 ...
0
votes
1answer
49 views

Some newbie questions about bitcoin transactions and anonymity

I am totally new to the Bitcoin thing and have installed Electrum yesterday after having read a lot of reviews on different local wallet options. I am not really planning to use it yet, but I want to ...
1
vote
0answers
38 views

Is it possible to short on Bitfinex using a SELL-STOP, then BUY-STOP and BUY-LIMIT at the same time?

I would like to know if it's possible to do this short order without having to manually add the stop loss after it's opened. Say the price is currently $300, and if it hits $280 I know it will ...
4
votes
2answers
163 views

How could a time warp attack be prevented?

jarpian explains what a time warp attack (AKA zeitgeist attack) is: This is a 51% attack where the attacker sets the block timestamps artificially to lower the difficulty, allowing him to profit ...
0
votes
1answer
39 views

How can I be sure that bitcoin mining software is not compromised?

I have been interested of generating Bitcoins but how can I be sure that the software that is available for this is not somehow compromised? My concern is that the software may have some backdoor ...

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