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Why is Poisson instead of Negative Binomial used for computing attacker's potential progress?

In chapter 11 of the Satoshi's paper it is claimed that: The recipient waits until the transaction has been added to a block and z blocks have been linked after it. He doesn't know the exact ...
4
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2answers
2k views

how exactly was the original coefficient for difficulty determined?

I'm assuming difficulty has a "target" of 10 minutes because the coefficient satoshi chose becomes multiplied by a variable to help the network remain in proportion. IE, if the network hashrate is 2x ...