Hi You can download / try out Digest::Hashcash-0.04 with version 1 stamp support. Thanks to Jason for adding the verification code which got me started on the minting code. I added some parsing support for version 1 extensions. Here is the changelog: - changes from Jason to verify version 1 stamps - more changes from Adam Back: code to create version 1 stamps; associated methods for v1 stamps: extension(), version() - create v1 stamps by default - fix some bugs (hash method was ignoring arguments) - add extension parsing - fix randomness (earlier versions using rand(3)) - add version1 extension tests You can download it from: http://www.hashcash.org/libs/perl/ http://www.hashcash.org/libs/perl/Digest-Hashcash-0.04.tgz I am not sure how you add updates to CPAN. Cc Marc Lehmann. Maybe Marc would like to tweak the code for stylistic preferences and/or fix any misconceptions about how the class was intended to work. Adam