[hashcash] Re: Hashcash vs. Time?

Adam Back wrote:

> Aside from challenge-response, another approach is to have an agreed
> standardized stamp cost and change this over-time.

maybe we should create a small page about the trade-offs of the four 
different techniques we know about today for managing postage?

1) challenge response (nobody's favorite)
2) increase by the clock
4) passive broadcast (my favorite)
8) active broadcast (i.e. full and partial injection)

---eric

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