>>>>> "Anonymous" == Anonymous <cripto@xxxxxxx> writes: [...] Anonymous> The time for hashcash collisions of a substantial number of Anonymous> bits, 10 or more, can be represented by a Poisson Anonymous> distribution. I think you are mixing up your distributions. The *time* taken to find a collision follows a geometric distribution, which is a discrete distribution, and is approximated by the exponential distribution, which is a continuous distribution. The number of hashcash collisions that we will find after N trials follows a binomial distribution, which is approximated (for large N) by a Poisson distribution. so: time to mint a single token ~ exponential distribution number of tokens minted after a fixed time ~ Poisson distribution Your analysis seems to be correct, though. But it could be rendered simpler by using the right distribution (and your introductory sentence could benefit from the precision). -- Hubert Chan <hubert@xxxxxxxxx> - http://www.uhoreg.ca/ PGP/GnuPG key: 1024D/124B61FA Fingerprint: 96C5 012F 5F74 A5F7 1FF7 5291 AF29 C719 124B 61FA Key available at wwwkeys.pgp.net. Encrypted e-mail preferred.