Just got a plastic case the other day from Surplustronics. It was only $11.50 and although being the budget version, it does the job really well and looks pretty cool. Any see through case allowing the insides to be seen makes people look twice as opposed to looking at a black box. So just because… Read More »
Everything is simple when you know how. To find the hostname of your Raspberry Pi just type: hostname After you SSH in of course.
I just got fibre internet this morning. The installation took from 8.30am to about 2pm. The speed is rated at 100/20 which is 100Mbps download and 20Mbps upload. What are actual speeds? Here is a before and after. Before: After: Now this is on a WiFi connection with a standard modem provided by the ISP… Read More »
If you are reading about endian (big and small) and seen snippets of code where you AND the input with 0xff00 and then shift the result say by 8 via >> 8 and wondering what the heck is going on then you’ve come to the right place. If you have an input such as int… Read More »
Understand how bitcoin mining works can seem like a huge task. They key is to break it down piece by piece. The first step is to understand what SHA256 is. Search on Google and read all you can about it. Then read this document: fips-180-4.pdf. The Federal Information Processing Standards Publication. Spend 2 weeks reading… Read More »
If you have been looking at bitcoins and in particular the SHA256 algorithm, you would have come across this formula: Maj(x,y,z)=(x∧y)⊕(x∧z)⊕(y∧z) Ch(x,y,z)=(x∧y)⊕(¬x∧z) The first thing I said to myself was “What the heck does this mean? Do I need a PhD to understand this?” Well, the good news is that the meaning is pretty simple… Read More »
I’ve done a lot of reading trying to figure out what a bitcoin target really means and after reading over 10 different explainations, over several days, I think I finally understand. Here are some of the basics. 1. You’ll see people talk about the maximum target of: 0x00000000FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF. What the heck does this mean and… Read More »
After lots of Googling to try and understand what an exponent bias really means, I came across this video which explains it pretty well. When someone talks about biasing the exponent, it means trying to represent negative numbers with positive numbers so you don’t have to put a negative sign in front. It is just… Read More »
So you’ve Googled bitcoin target, read a whole bunch of stuff but still don’t get it and want to see real examples for comparisons. You’ve come to the right place. I learn best with examples so here goes. From Bitcoin wikipedia “The target is a 256-bit number (extremely large) that all Bitcoin clients share. The… Read More »
If you want to know what files are going to be installed/placed on your computer when you download a package for Ubuntu, you can run this command: apt-file list package_name If you run this and get this error: The program ‘apt-file’ is currently not installed. You can install it by typing: sudo apt-get install apt-file,… Read More »