where in the Bitcoin Protocol is SHA256(SHA256(x)) performed and why?

I’m trying to understand how a partial fill would / should happen at an exchange and how that would occur For example, if the BTC rate was $10/BTC and Someone wanted to buy 100 BTC […]

The blockchain.info API allows for querying information about a particular Transaction by its ID. But if you want to follow the coins to the next transaction, I’m not seeing what the next query should be. […]

I am using BitcoinJ for my java application which fetches the test network’s genesis block. I referred to the basics mentioned at JavaWorld and BitcoinJ’s Google Code wiki. I am able to get it running […]

In the situation that you want no individual to have the complete private key, but you do want to share the complete key between 3 individuals, of which any 2 can construct the complete key, […]

I’d like to extract the most performance possible from oclvanitygen. Can anyone tell me what the best practices are with this tool? Examples may include: Use operating system X, or video card Y Ensure that […]

I’m toying with the idea of starting to mine, and was wondering how to calculate how many hashes on average must be tried before one will “hit” a valid block? I’m talking about a single […]

As I understand things, the security and integrity of Bitcoin rely on the assumption that its hashing is “hard” in some sense. However, in the past, processing power has increased exponentially. This has made some […]