Ken Shirriff’s blog
Click here to see how Ken gives a great insignt into teh SHA-256 algoritm. It’s not for teh faint hearted.
Allow yourself 30 minutes when you have a clear and receptive head.
The video shows how the SHA-256 hashing steps described above can be performed with pencil and paper. I perform the first round of hashing to mine a block. Completing this round took me 16 minutes, 45 seconds.