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1500 questions
35
votes
9 answers

Is there a Bitcoin bank, which gives interest on my deposit?

Is there any Bitcoin bank I can place my Bitcoins in that will give me a decent interest rate. It should be at least 1% for it to be worth it.
David
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34
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7 answers

Why do the price of bitcoins vary wildly between exchanges?

▼ mtgoxUSD 95.0000 108.452 -12.404% 2428892 ▼ btc24EUR 67.5047 89.036 -24.183% 348160 ▼ btceUSD 82.9900 106.794 -22.289% 277286 ▼ bitstampUSD 75.9900 109.320 -30.489% 249563 ▼ mtgoxEUR 74.2244 …
user4951
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34
votes
5 answers

Bitcoin Mining ASICs used for cryptographic application? Rainbow tables?

What is the potential that the ASICs being developed for mining could be used for other cryptographic applications such as building rainbow tables? I know that for instance those that crack GSM with rainbow tables utilize systems similar to those…
gesell
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34
votes
4 answers

Are there any _true_ anonymous cryptocurrencies?

I've been looking into Bitcoin recently and stumbled upon numerous notes how Bitcoin is not anonymous at all, or how it's only partially anonymous and you can easily trace your funds. So, this brings us to my question: is there any true anonymous…
HowardLoosingIt
34
votes
5 answers

How to make a new blockchain from scratch

In the same vein as setting up a private DNS root server and using whatever domain names you want, how do you generate your own blockchain and mine your own coins? P.S. I don't want any answers like "why would you want to?" I want to do it…
supertaco
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33
votes
3 answers

Why does Bitcoin use two hash functions (SHA-256 and RIPEMD-160) to create an address?

Why do we use 2 hash functions (both SHA and RIPEMD) to create an address? Why not just use one hash function?
anapaso
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33
votes
6 answers

What are tainted coins exactly?

I've come across the term of a tainted coin several times now. I understand that coins, or better, the origin of a coin can be traced throughout the blockchain. I've read that bitcoins can be disassociated from an address, by sending it to a…
btctb
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33
votes
3 answers

How do transactions leave the memory pool?

How does my bitcoin core client know when to drop a transaction from the memory pool? Is it as simple as a specific period of time?
inersha
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33
votes
3 answers

What is an "unspent output"?

What is the meaning of the term "unspent output" in the Bitcoin protocol?
ripper234
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33
votes
7 answers

Is a private blockchain better in any sense than a database?

Since the banks appear to be currently looking into the idea of "blockchains" but don't want to be dealing with "Bitcoin", it seems that there is a lot of hype for private blockchains out there like Eris or Hyperledger. However, a lot of people tend…
ThePiachu
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33
votes
1 answer

How can I restore my wallet?

I just purchased a new laptop and I want to decommission my old one. I have a back-up of my wallet.dat file copied to my new PC. What do I need to do to restore it to my Bitcoin (Windows) client? Please note, this is a wallet.dat file that is…
RLH
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33
votes
2 answers

How do I cancel my blockchain transaction (still unconfirmed)?

I am using blockchain.info. I have made a bitcoin transaction of 22.00883562 BTC to the address 1A9eUAc78tGx65X3CuC9WfSKXXgxjU8ccC. You can see the transaction at…
Umle
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33
votes
3 answers

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 queued transactions and will be included in another…
nmat
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33
votes
10 answers

Is there any where to get free testnet Bitcoins?

I'm building a project with bitcoins and want to test it with testnet. However, I don't have any testnet bitcoins, and despite the difficulty being less than 100 usually, I still haven't been able to mine a block on my PC (CPU only) after a day. Is…
Earlz
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33
votes
1 answer

What is the database for?

I see the block chain is stored according to the block chain format specification. But I also see there is a database, which is currently a leveldb database. Why is the block chain stored in two different ways? Seems redundant.
turtlepower
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