This does not affect hashcash, because contrary to some descriptions,
hashcash is not based on hash collisions. Technically it is based on
partial preimages of zero. No attacks are known to speed up searching
for such values with SHA-1. The brute force search that hashcash depends
on is still the best you can do.
The only effect might be if people begin to perceive SHA-1 as "broken" then they might mistakenly mistrust hashcash.
The question is whether to make that move sooner or later?
-------------------------------------------------------------- from: Jonathan "Chromatix" Morton mail: chromi@xxxxxxxxxxxxxxxxxxxxx website: http://www.chromatix.uklinux.net/ tagline: The key to knowledge is not to rely on people to teach you it.