29 Sep '14, 11pm

Mining Bitcoins with Pencil and Paper

Right now there are thousands of computers connected to the Internet, dutifully calculating SHA-256 hashes and sending their results to other peers on the Bitcoin network. There’s a tremendous amount of computing power in this network, but [Ken] is doing it with a pencil and paper . Doing the math by hand isn’t exactly hard, but it does take an extraordinary amount of time; [Ken] can calculate about two-thirds of a hash per day. The SHA-256 hash function used for Bitcoin isn’t really that hard to work out by hand. The problem, though, is that it takes a 64 byte value, sends it through an algorithm, and repeats that sixty-four times. There are a few 32-bit additions, but the rest of the work is just choosing the majority value in a set of three bits, rotating bits, and performing a mod 2. Completing one round of a SHA-256 hash took [Ken] sixteen minutes and forty-five secon...

Full article: http://hackaday.com/2014/09/29/mining-bitcoins-with-penci...

Tweets

Mining Bitcoin With Pencil and Paper

gizmodo.com 29 Sep '14, 8pm

Bitcoin mining is a key part of the security of the Bitcoin system. The idea is that Bitcoin miners group a bunch of Bitco...

Mining Bitcoin with pencil and paper: 0.67 hash...

reddit.com 28 Sep '14, 8pm

Understood. I think it's a neat on-paper idea, the blockchain is fairly decent technological concept, but it's not going t...

Mining Bitcoin with pencil and paper: 0.67 hash...

righto.com 28 Sep '14, 4pm

about my energy consumption. There's not much physical exertion, so assuming a resting metabolic rate of 1500kcal/day, man...

Mining Bitcoin with pencil and paper: 0.67 hash...

righto.com 28 Sep '14, 5pm

about my energy consumption. There's not much physical exertion, so assuming a resting metabolic rate of 1500kcal/day, man...

Ken Shirriff's blog: Mining Bitcoin with pencil...

righto.com 28 Sep '14, 4pm

about my energy consumption. There's not much physical exertion, so assuming a resting metabolic rate of 1500kcal/day, man...

This is what mining bitcoin by hand looks like:

This is what mining bitcoin by hand looks like:

motherboard.vice.com 30 Sep '14, 12pm

If you can’t get your head around mining bitcoin with increasing amounts of computer power, don’t even think about doing i...

#bitcoin

bloomberg.com 30 Sep '14, 4am

Why does anyone devote any time to checking transactions? Because programmers earn new bitcoins for the work -- if their c...

Toomim Bros Bitcoin Mining Concern

toom.im 28 Sep '14, 6pm

Located in the Pacific Northwest of the USA, the Toomim Brothers bring decades of experience in electrical and computer en...

Companies Send Free Bitcoins As Advertisements #bitcoin

Companies Send Free Bitcoins As Advertisements ...

cryptocoinsnews.com 28 Sep '14, 9am

From what I’ve read and tested, all of the addresses that bitcoins have been sent to from companies have been posted on th...

Brilliant Device Turns Waste Paper Into Pencils

inhabitat.com 29 Sep '14, 7am

The designers make the clever connection between an office’s waste stream and supply needs with a satisfying design that p...