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TIMESTAMPS
  • 00:06
    At the start of SHA-256, the initial constants are provided by the NSA.
  • 00:31
    Compute the majority function -- are there more zeros or ones?
  • 00:58
    Convert to decimal
  • 01:10
    2 position right shift
  • 01:32
    Sum the 3 shifted values -- look to see if it is odd or even.
  • 02:31
    Use the choosing to combine E, F, and G.
  • 03:39
    Combine data for first sum.
  • 03:52
    The first time the input data is used.
  • 04:05
    Another NSA constant
  • 04:57
    Add the numbers in hexadecimal.
  • 05:54
    Add new sum, majority value and previous sum
  • 06:42
    This is the new A value -- one of the values for output
  • 06:52
    B is the old A value
  • 06:58
    C is old B value
  • 07:02
    D is old C value.
  • 07:07
    Compute new E value.
  • 07:44
    One round of SHA-256 hashing complete. SHA-256 requires 64 rounds.

Mining Bitcoin with pencil and paper

Bitcoins are mined using a cryptographic algorithm called SHA-256. This algorithm is simple enough to be done with pencil and paper, as I show in this video. Not surprisingly, this is a thoroughly impractical way to mine. One round of the algorithm takes 16 minutes, 45 seconds which works out to a hash rate of 0.67 hashes per day.






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