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25
votes
2answers
5k views

Will all 21 million units be completely mined one day?

It is written that the supply of Bitcoin units is limited to 21 million and that this limit will approximately have been reached around the year 2030. But is there an actual "last Bitcoin" (or "last ...
25
votes
1answer
31k views

How to mine in Ubuntu?

How do you mine in Ubuntu 11.04? Are there any GUI miners like poclbm-gui for Ubuntu?
25
votes
1answer
27k views

How can I start my own mining pool?

Is there some relatively simple (and preferably free/open-source) solution for starting my own mining pool? How close to "turnkey" would such a solution be and with pool operators mostly running at 0% ...
24
votes
3answers
4k views

What are the implications of Schnorr signatures?

Adam Back (adam3us) explained in March, 2014, but it is all math. There's another short post with advantages, though. This answer on crypto.SE claims that Bitcoin considered using Ed25519 which is ...
24
votes
5answers
5k views

How to prove to my landlord that bitcoin came from my wallet?

Let's say I'm paying my monthly rent using bitcoin. I'm going to set up a script to send 5 bitcoin from my wallet to my landlord's address every month. I will not be able to tell beforehand which ...
24
votes
2answers
6k views

What is the block maturation time?

I was reading the wiki article about the blockchain and I didn't understand the part in bold: When a block becomes an orphan block, all of its valid transactions are re-added to the pool of ...
24
votes
5answers
6k views

What are the limits of m and n in m-of-n multisig addresses?

This method describes how to create a 2-of-3 multisig. I heard that there is an inherent limit with the number of multisig parts, limiting them to 3. Does the standard method described above of ...
24
votes
6answers
183k views

Where can I buy Litecoin?

I know Litecoin is sold on Coinbase, but I'm wondering if anyone has compiled a list or knows of other exchanges selling the currency?
24
votes
6answers
1k views

What cryptocurrency systems predate Bitcoin, and how do they differ from it?

Although Bitcoin is certainly making strides as the first cryptocurrency to enter (comparatively) widespread use, cryptocurrency has long been a topic of discussion in fiction and academia. What ...
24
votes
10answers
23k views

Where can I get historic data series of Bitcoin prices?

Where can I get a time series of (date, bitcoin price in USD)? BitcoinCharts no longer provide historic data, only the last 20,000 samples.
24
votes
3answers
5k views

Can one safely buy vanity addresses from a third party without risking one's coins from being stolen?

One can easily generate vanity addresses for Bitcoin, but they can take quite awhile to generate. Outsourcing that process to someone with a strong mining rig is an option, but then one runs into the ...
24
votes
8answers
4k views

What happens to my bitcoins when I die?

What happens to my bitcoins when I die? Are they lost in the network?
24
votes
2answers
4k views

Useful alternative Bitcoin transaction scripts

The Bitcoin wiki describes a transaction's script as something that describes "how the next person wanting to spend the Bitcoins being transferred can gain access to them". The script for "a typical ...
24
votes
2answers
6k views

How does AsicBoost work?

The AsicBoost paper by Timo Hanke and Sergio Demian Lerner describes a way of increasing ASIC performance by 20%. It's a bit sparse on the details, though. What are they optimizing?
24
votes
1answer
26k views

What is the difference between the rpc port 8332 and port 8333?

What is the difference between the protocol and commands used on default ports 8332 and port 8333? From what I gather, port 8332 is the RPC port, it's "sensitive", only allowed by local host by ...
24
votes
1answer
14k views

What is a hard fork?

When people talk about possible changes to how Bitcoin works they sometimes say a particular change would require a hard fork. What does that mean? Can a hard fork cause problems?
24
votes
2answers
12k views

Bitcoin-Qt command line control on Mac

I'm trying to communicate with the new Bitcoin-Qt -server via a command line on Mac. I run ./Bitcoin-Qt -server, the application starts, but my terminal window is stuck on an empty line (no matter ...
24
votes
6answers
3k views

Can a bitcoin be destroyed?

Its the hypothetical future and BTC2 is being designed. Everyone loves BTC2 and no-one wants the old BTC1 any more. People who have BTC1 would be annoyed that their assets are suddently worth a lot ...
24
votes
3answers
5k views

What factors affect the value of a Bitcoin?

Obviously the number of existing Bitcoins affects the value, but what else? What are some of the primary factors for a rise or fall in a Bitcoin's worth?
24
votes
3answers
14k views

How do miners select which transactions to include in a block?

Where and how do you view and select which transactions to include in the block you are trying to create? Do you look on the blockchain? Is there some tool that you can use that allows you to see ...
24
votes
4answers
23k views

Are there any open-source trading bots out there?

Has anyone published an open-source trading bot that runs on a Bitcoin exchange?
23
votes
6answers
11k views

Why did Satoshi design Bitcoin to be mineable only on specialized hardware, if the goal was decentralization?

GPU-mineable cryptos are arguably more decentralized. Did he simply miss this design aspect or does this sound fishy to you?
23
votes
4answers
2k views

What is the difference between BitCoin, Bitcoin, and bitcoin?

I've seen several capitalizations of the term "bitcoin". What do all these mean?
23
votes
6answers
7k views

Is Bitcoin a scam?

Adam Cohen of SeatGeek called Bitcoin a "scam". Other people have compared Bitcoin to a Ponzi or pyramid scheme. Can Bitcoin be considered a scheme to defraud people?
23
votes
4answers
4k views

Why don't the timestamps in the block chain always increase?

The timestamps starting at block 145044 are: 145044: 2011-09-12 15:46:39 145045: 2011-09-12 16:05:07 145046: 2011-09-12 16:00:05 // ~5 minutes before prior block 145047: 2011-09-12 15:53:36 // ~...
23
votes
11answers
15k views

Is there a blockchain.info for testnet?

I'm trying to test to see if transactions went through or not and blockchain.info is super helpful for this on the real network.
23
votes
5answers
15k views

Is there an open source Bitcoin exchange?

I just found this project, which is described a.t.m as a learning project. Is there a more serious, open source Bitcoin exchange? I'm aware exchanging BTC for fiat money can be quite complex, and ...
23
votes
2answers
30k views

json-rpc via curl

I'am running Bitcoin-qt 0.8.6.1-beta on Qt 4.8.3 on windows 7 64. below is my .conf content in %appdata%/bitcoin folder rpcuser=bitcoinrpc rpcpassword=ahything rpcallowip=127.0.0.1 rpcallowip=192....
23
votes
2answers
11k views

What is “difficulty” and how it relates to “target”?

I don't understand what "difficulty" means and how it really relates to "target". I understand what "target" is - it tells the miners, how small the resulting hash should be. (Basically, how many ...
23
votes
4answers
34k views

How do I import private keys from Bitcoin-qt to Multibit client?

Question says it. I spent 20 mins Googling. Saw several links on bitcointalk.com but amazingly found no solution to this. Am I the first one trying to do this? Note the following are not the ...
23
votes
1answer
5k views

How is the whitepaper decoded from the blockchain (Tx with ~1000x m of n multisig outputs)

The whitepaper is apparently encoded at 54e48e5f5c656b26c3bca14a8c95aa583d07ebe84dde3b7dd4a78f4e4186e713, which is an m of n multisig Tx with 947 outputs (just under the scriptsig limit of 20kB!). ...
23
votes
1answer
13k views

How does the Kimoto Gravity Well regulate difficulty?

Maxcoin will use the Kimoto Gravity Well (KGW) to regulate the difficulty. From what I could find about the KGW, it retargets after every block and adjusts very quickly, e.g. when multipools add and ...
23
votes
8answers
2k views

Can I send bitcoins with my mobile phone?

Is it possible to send and receive bitcoins with a mobile phone? If so, are there bitcoin clients for Android or iOS?
23
votes
1answer
4k views

What is Transaction Malleability?

The Bitcoin exchange MtGox has stated in this press release that "transaction malleability" caused them to stop sending bitcoins. A recent question asked if it really is an issue. But what is ...
23
votes
4answers
5k views

What are the downsides of proof of stake?

I am very skeptical about the security of the proof of stake system. Is it really that secure? Are there no disadvantages?
23
votes
2answers
5k views

How should you backup your wallet?

How often? Is backing it up once enough? Any best practices to storing the backup?
23
votes
2answers
6k views

How can I compute mining profitability? [duplicate]

It was asked elsewhere, but I'm re-asking the question in a less time sensitive way. Can you please list some of the techniques, charts, spreadsheets, calculators or other tools that help someone to ...
22
votes
2answers
15k views

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 ...
22
votes
3answers
5k views

How does lost BTC affect the market in the long run?

I bought some bitcoins in 2012 and forgot about it. Now years later I discovered that the company who maintained the wallet went bankrupt and their website no longer works. I therefore have lost ...
22
votes
3answers
3k views

What happens if there are no transactions in a block?

What happens if there are no transactions in a block? Suppose there is a 10 minute time frame in the middle of the night, maybe on a holiday, and there are no transactions made. Do the miners get ...
22
votes
2answers
53k views

How are public and private keys related to the wallet?

I understand that all the Bitcoin protocol is based on an asymmetric cryptography. A user gets 2 keys (public and private). How do these keys connect to the Bitcoins? How are the keys are related ...
22
votes
7answers
10k views

Why does my wallet need to download the whole transaction history?

I started a wallet, and it is downloading and synchronizing lots of transactions. This takes time and network bandwidth. Why is this necessary? Is this some form of accountability? With Paypal, ...
22
votes
3answers
12k views

How do I implement a Merkle Tree?

I`m slowly implementing some Bitcoin protocols, and I'm not sure how to properly understand the Merkle Tree from the Bitcoin wiki: https://en.bitcoin.it/wiki/Protocol_specification#Merkle_Trees I have ...
22
votes
3answers
34k views

Where is Bitcoin information (wallet.dat) stored on OS X?

Is there a wallet.dat for OSX? Where is it located? Taken from https://github.com/bitcoin/bitcoin/issues/544
22
votes
7answers
19k views

Are bitcoins really immune to inflation?

I see people everywhere saying that bitcoins are immune to inflation but nobody has explained it adequately to me. I understand why bitcoins would be more or less immune to inflation cause in ...
22
votes
1answer
11k views

How big is the UTXO database?

Is there a query that will return the size of the UTXO database? Specifically, the total number of unspent outputs.
22
votes
2answers
5k views

Could the EC2 infrastructure be used to efficiently launch a 51% attack?

This excellent answer from Serith states that one would need 31150 ATI 5870 graphics cards to launch a 51% attack. Amazon EC2 offers computers for rent for 2.10$ per hour. These instances have 2 x ...
22
votes
4answers
19k views

Is bitcoin mining itself compromising the security of SHA256

Following good scientific practice I propose a Theory/Hypothesis and now ask you to test it. Initially this is a "thought" experiment but may progress to real testing depending on your thoughts. Back ...
22
votes
2answers
34k views

What is the wallet “word seed” that is commonly used in popular wallets clients and what does it do?

I've been using a pretty old version of Multibit classic and recently decided to upgrade. I tried out Multibit HD and Electrum and noticed that both have me set up a wallet with a "word seed". It's ...
22
votes
5answers
36k views

Bitcoin-Qt setup: Change block-chain file location, settings? documentation?

I am installing Bitcoin-Qt and have been reading about Bitcoin basics, but I found very little information on the client. I have a few questions about the Bitcoin-Qt program (v0.8.1-beta under Windows ...

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