>>>>> "Justin" == Justin <justin-hashcash@xxxxxxxx> writes: [...] Justin> Can't the counter be abused by starting it at an arbitrary Justin> value? If it's used for filtering, inflating the counter gives Justin> the sender an advantage. I think that the counter is only meaningful to the recipient as "interesting statistics", and isn't supposed to have any practical purpose on the receiving end. But I guess Adam would know more about that. -- 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.