[hashcash] stamp creation std. deviation
- From: Adam Back <adam@xxxxxxxxxxxxxxx>
- To: hashcash <hashcash@xxxxxxxxxxxxx>
- Date: Fri, 13 Aug 2004 05:47:07 -0400
John Honan sent an email offlist about stamp the definition.
This is kind of academic / independent from stamp format as that is
already fixed for version 1.
But one aspect that came up is that there are two possible stamp
defintions:
A. (as in v1) value = claimed_bits if claimed_bits <= measured_bits
B. or value = claimed bits if claimed_bits == measured_bits
in B the measured_bits has to match the claimed bits exactly (>
claimed bits would be rejected).
Question is which is better? Which has lower standard deviation I
think is the right question. Clearly computing an n-bit stamp of type
B costs more than a type A n-bit stamp because you have to throw away
> n-bits. But that is ok as we just pick a convenient bit size.
What happens to the std. deviation -- is it better with type B or type
A?
Adam
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