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164 votes
11 answers

Why is my transaction not getting confirmed and what can I do about it?

I sent a transaction without (or with an exceptionally small) transaction fee using extremely small or unconfirmed inputs while the stars were not standing right. For whatever reason, I have been ...
Avram's user avatar
  • 1,929
204 votes
9 answers

What exactly is Mining?

I have heard that mining is for people with ready hardware and blah blah blah... But what exactly is it? Does it operate like real mining? I mean, people talk about it like you are physically mining.
Phonics The Hedgehog's user avatar
64 votes
3 answers

In the ASIC-age, is it worth starting mining Bitcoin at home?

I have recently learned about Bitcoin and would like to get rich quickly into mining. I have control of a laptop library full of ancient computers powerful gaming PC cluster of GPUs an old ASIC, I ...
Murch's user avatar
  • 71.7k
9 votes
4 answers

Is it normal to be asked for an advance fee on a withdrawal?

I was approached out of the blue being told that I was supposed to receive a sudden windfall, someone opened an automatic trading account in my name, or offered to invest in a lucrative mining ...
Murch's user avatar
  • 71.7k
130 votes
7 answers

How do you obtain bitcoins?

This is a question many people ask when they're introduced to Bitcoin. Bitcoin sounds interesting, but if I want to use this system I will need to get some coins, otherwise, there's no way I can ...
David Ammouial's user avatar
116 votes
9 answers

How much Bitcoin will I mine right now with hardware X?

Say I have a given piece of hardware (CPU/GPU). Where can I find out how much Bitcoin will I mine per day?
ripper234's user avatar
  • 26.5k
52 votes
3 answers

How does change work in a bitcoin transaction?

It seems that when you send a bitcoin transaction, all the coins in the sending address are spent in that transaction, divided into the amount that you intended to send, and "change", which goes back ...
Thilo's user avatar
  • 4,751
40 votes
10 answers

I am new to Bitcoin, how can I get started?

I am new to both StackExchange and to the new online currency called Bitcoin. I understand what Bitcoin is and how it works, but I was wondering: how do you actually get started with Bitcoin? I have ...
PowerofMerlin's user avatar
149 votes
8 answers

What can an attacker with 51% of hash power do?

Suppose organization X has 51% of the hash power for a period of 1 week. In this week, what exactly can and can't X do?
ripper234's user avatar
  • 26.5k
5 votes
1 answer

I have lost my wallet, what can I do?

I used to be interested in Bitcoin a few years ago and have recently become aware of it again. I used to have a wallet back then. Given that many years have passed, what I remember is a bit fuzzy. ...
Murch's user avatar
  • 71.7k
84 votes
3 answers

How to redeem a basic Tx?

Given a raw, standard Tx (wiki): 01000000 01 26c07ece0bce7cda0ccd14d99e205f118cde27e83dd75da7b141fe487b5528fb 00000000 8b ...
ThePiachu's user avatar
  • 43k
17 votes
6 answers

What would happen if you send Bitcoin (BTC) to a Bitcoin Cash (BCH, aka BCC) address?

Could someone please explain what happens if someone sends bitcoin to a Bitcoin Cash address after the August 1st fork? Would there be a way to recover them?
tonyk2017's user avatar
  • 171
76 votes
3 answers

How is difficulty calculated?

Can anyone explain me in the plain English how difficulty is calculated. I have a very approximate understanding that it is calculated based on the amount of hash power in all the bitcoin community ...
Salvador Dali's user avatar
140 votes
11 answers

Is it possible to brute force bitcoin address creation in order to steal money?

Bitcoin users frequently generate new addresses for each transaction they make, which greatly increases the number of bitcoin addresses being used to receive money. Would it be possible (and ...
nmat's user avatar
  • 11.5k
67 votes
9 answers

Where do bitcoins come from and what gives them their value?

Where do bitcoins come from? From the video it appears they are just being produced by "miners" and sold to people. So who backs Bitcoin or gives it its value?
eMansipater's user avatar
  • 14.4k
28 votes
3 answers

Is each Bitcoin address unique?

I am wondering whether each bitcoin address is unique. I would assume yes. Then, how is this enforced given the distributed address generation? As I understand it, each time an address is generated, a ...
dexter's user avatar
  • 383
16 votes
4 answers

Cannot access my bitcoins because my wallet is still synchronising. What can I do to spend them immediately?

I have purchased bitcoins and have downloaded Bitcoin-QT, but my wallet is taking forever to synchronize to the network. I can't access my wallet because it is still in the sync process. I have the ...
Alex Jackson's user avatar
10 votes
2 answers

Bitcoin Cash accidentally sent to Bitcoin address. Can I get them back?

I managed my Bitcoins Cash in a Electrum Cash wallet on my PC. From there, I accidentally sent them to another internet based wallet, but didn't notice that this wallet is for Bitcoin and not Bitcoin ...
Wolfgang Klenk's user avatar
113 votes
13 answers

Is there a way to set up proof-of-work systems so they would be even more useful?

One of the arguments made against Bitcoin's design choices is that it wastes resources authenticating transactions. In particular, finding small hashes is completely useless for the world. Are there ...
Artem Kaznatcheev's user avatar
69 votes
2 answers

Can someone explain how the Bitcoin Blockchain works?

I'm trying to figure out how the blockchain works and how to read it via website. Is there a laymen way of explaining how the block chain works and how to read the blockchain to trace ...
Patoshi パトシ's user avatar
38 votes
2 answers

What is the coinbase?

I searched the bitcoin wiki and found references to coinbase, but no clear cut explanation of what exactly it is. I know that miners can tag their coinbases (that is how some sites tell who mined a ...
Andrew Burns's user avatar
51 votes
3 answers

How can I run bitcoind in pruning mode?

I read this comment: You could consider running a pruning node, which is practically the same as a full node (including security), except it throws away some of the old history. Version 0.11 ...
user's user avatar
  • 1,093
25 votes
5 answers

How do I recover from a cryptocurrency scam?

I lost about $45,000 to crypto investment scam just recently. The company posed as an investment company that could deliver a certain percentage in returns if you deposit your Bitcoin with them. At ...
Michael Mason's user avatar
4 votes
3 answers

What kinds of wallets are there?

Can I get short a explanation about cryptocurrency cold/hot wallets? Are there more kinds?
karlito's user avatar
  • 43
191 votes
2 answers

How do Bitcoin clients find each other?

What protocols or algorithms are Bitcoin clients using in order to find their peers? I learnt that BitTorrent clients may rely on central computers called trackers. Do Bitcoin clients need any kind of ...
Ning's user avatar
  • 2,751
45 votes
2 answers

How do I import a private key into Bitcoin-Core?

How do I import a private key into Bitcoin-Qt? bitcoind is nowhere to be found, and pywallet says it requires "bsddb" when I run it, which is also nowhere to be found. I generated some vanity ...
lurf jurv's user avatar
  • 2,704
44 votes
2 answers

How can I export the private key for an address from the satoshi client?

If I want to transfer an address from the satoshi client into a different client, how can I find its private key to do so?
Chris Moore's user avatar
  • 14.7k
62 votes
3 answers

Will there be 21 million bitcoins eventually?

Every x blocks the mining reward is halved. Will the reward be halved forever such that we never quite reach 21 million bitcoins, or will we reach 21 million bitcoins at some point and will the reward ...
erikvold's user avatar
  • 873
14 votes
2 answers

I didn't receive a Bitcoin Payment. What does it mean when the Client is synchronizing?

Bitcoin newbie here. I recently installed the Bitcoin client, and purchased some bitcoins from Mt.Gox. My problem is that my client is constantly synchronizing. I've checked charts and seen that my ...
Russ's user avatar
  • 143
68 votes
7 answers

How many bitcoins will there eventually be?

Since bitcoins are being regularly rewarded to miners, will the number of bitcoins continue to grow indefinitely, or will there be a maximum total number of bitcoins in existence? And if there is ...
eMansipater's user avatar
  • 14.4k
66 votes
5 answers

What is a soft fork? What is a hard fork? What are their differences?

When people talk about possible changes to how Bitcoin works they sometimes say a particular change can be implemented as a soft fork. What does that mean? How does this compare to a hard fork?
Dr.Haribo's user avatar
  • 8,419
33 votes
3 answers

What is an "unspent output"?

What is the meaning of the term "unspent output" in the Bitcoin protocol?
ripper234's user avatar
  • 26.5k
31 votes
2 answers

Redeeming a raw transaction step by step example required

I am looking, specifically, for a step by step example transaction of sending Bitcoin which uses an actual transaction (How To Redeem A Basic Txn, from a few years back, does a great job of outlining ...
Wizard Of Ozzie's user avatar
70 votes
11 answers

Will Bitcoin suffer from a mining Tragedy of the Commons when mining fees drop to zero?

One issue that I haven't seen clearly addressed is the possible Tragedy of the Commons in Bitcoin's future (see this answer). 40 years into the future, the only significant direct benefit for honest ...
ripper234's user avatar
  • 26.5k
55 votes
2 answers

What is the longest blockchain fork that has been orphaned to date?

The orphaned blocks view from shows a recent fork of the blockchain (starting with block 173,928) that went four blocks long before being orphaned. Other than the controlled rewind ...
Stephen Gornick's user avatar
60 votes
4 answers

What keeps the average block time at 10 minutes?

I've been told "the network" sets the difficulty level such that there will be one new block mined every ten minutes. I imagine the rich would instead prefer to keep difficulty as high as possible to ...
billpg's user avatar
  • 2,030
39 votes
4 answers

What are the keys used in the blockchain levelDB (ie what are the key:value pairs)?

I am wondering if I can use node.js and levelup to access a copy of the blockchain database directly. But from what I can see, I need to know the name of the key(s) before I can get any data, as this ...
T9b's user avatar
  • 1,334
37 votes
3 answers

How can I start mining Bitcoin?

Ok. I don't care if I make only a small amount of bitcoins mining. I want to mine. How do I setup my machine (amd x64 4.6Ghz 6GB/RAM with GeForce Nvidia 7300, LinuxMint 10) to start mining? Is it ...
H_7's user avatar
  • 983
20 votes
6 answers

Recipient has “not received” the Bitcoin I sent, but the transaction is confirmed

I sent bitcoins to the address I was given (double checked). The recipient is claiming they did not receive it. I sent them a different payment yesterday at 8:30p and they didn't get it until 4:00am ...
Cccc1234's user avatar
  • 201
14 votes
9 answers

How can I sell bitcoins and transfer the funds to my bank account?

A friend of mine gave me two bitcoins which I now want to sell. I don't understand the process which would enable me send the funds generated to my bank account.
dom.'s user avatar
  • 141
19 votes
3 answers

Are there Bitcoin password crackers I can use to recover forgotten passwords?

I've lost the password to one of my wallets (it's a small one, don't worry). I was sure I remembered the password ... but evidently I don't. Is there a program that I can use to brute-force my ...
ripper234's user avatar
  • 26.5k
163 votes
6 answers

What are bitcoin miners really solving?

As with mining, what are the bitcoin miners really solving? I read they are solving hashes, but what does that really mean. Can we see what they are solving? Can someone give an example of what a ...
Patoshi パトシ's user avatar
66 votes
9 answers

How anonymous are Bitcoin transactions?

I read some sources that say Bitcoin transactions are anonymous, some that say they are semi-anonymous, and some that say they are not anonymous at all. In what ways are the transactions anonymous ...
Michael McGowan's user avatar
16 votes
2 answers

How can we be sure that a new block will be found?

How do we know the HASH function will produce an output that fulfills the difficulty, i.e. is below Is it possible that no proof will be found so that the HASH will produce that ...
user4691's user avatar
  • 261
40 votes
3 answers

Who gets Bitcoin transaction fees?

Whenever I send bitcoins from one wallet or one exchange to the next there is always a fee. This makes sense with the exchange sites, they are just collecting the fee so they can make a living. What ...
Albert Renshaw's user avatar
21 votes
4 answers

How can I setup Bitcoin to be anonymous with Tor?

Bitcoin is billed as many things, among them its anonymity is highly regarded. While it is true that a transaction does not identify a user or wallet, recent news shows that there is the potential for ...
Willtech's user avatar
  • 3,196
42 votes
4 answers

Where is the data folder for Bitcoin-Qt?

Where can I find the blockchain, wallet.dat, etc. on each of the operating systems Bitcoin-Qt supports?
Chris Moore's user avatar
  • 14.7k
132 votes
10 answers

How much will transaction fees eventually be?

Some people keep evangelizing that Bitcoin transaction fees are much lower than in PayPal or with credit cards. However, once nearly all 21 million bitcoins have been mined, the network will still ...
herzmeister's user avatar
  • 3,507
66 votes
3 answers

How to calculate transaction size before sending (Legacy Non-Segwit - P2PKH/P2SH)

I know that I pay the transaction fee per kB, so how can I calculate how large the transaction will be before I send it via the RPC api. I run a site using bitcoins, and I cannot let the user's ...
macintosh264's user avatar
59 votes
3 answers

What are bitcoin "confirmations"?

When I receive bitcoins I see a certain number of "confirmations" in the client. What do these mean? Why do most sites make me wait for 6 "confirmations" before a purchase will go through?
lemonginger's user avatar
  • 5,402

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