# Questions on: difficulty

Great explanation Augusto! Need to clarify one thing regarding target. 1. Network takes some random number and it generates its hash No, the target is not exactly a random number

How to calculate the target from bitsLet's start with a block-header, always 80-bytes that looks like this: 04000000b9e2784a84e5d2468cee60ad14e08d0fee5dda49a37148040000000000000000e9dd2b13157508891880ef68729a1e5ecdde58062ebfa214a89f0141e5a4717faefd2b

If the current difficulty is D, then the target hash (the value below which block hashes must go) is: 0x00000000FFFF0000000000000000000000000000000000000000000000000000 / D (by definition of difficulty, which is a fraction of the maximum target), or

The purpose of this page is to provide a general overview of the Bitcoin system and economy. Basic ConceptsCurrencyAlice wants to buy the Alpaca socks which Bob has for sale. In return, she must provide something of equal value to Bob

As I understand your question it has two parts. One is how to calculate an approximation of someone's hash rate externally, like from a server or proxy that can see their mining results but not their actual hashing process or hash rate. The other par

As is well known, testnet has a "20-minute rule": if no block is found within 20 minutes, the mining difficulty drops to 1 until a block is found. From some experimentation, it appears that bitcoind's getdifficulty function reports the difficulty of

This is an experimental technologyBecause this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in fu

I read through How is difficulty calculated? and want to understand where the "off-by-one" bug is in calculating difficulty. Here is a Matlab snipet I wrote to calculate difficulty. What are the correct block step intervals that I should use? Note: m