hashcash related news
These are technical news things. Ie things a developer or technical person
interested in hashcash might consider news on the deployment or tech front.
There is also a media articles section for things the
press have to say, and a papers section for hashcash
related academic publications.
- 10 Nov 2004 - below article slashdotted, David Mertz's
article appeared on slashdot
- 09 Nov 2004 - hashcash article - the
by David Mertz, PhD (author of the
python hashcash implementation). In his Charming Python column on
- 19 Oct 2004 - mdaemon hashcash support - ALTN technologies
mdaemon now supports hashcash see
- 03 Oct 2004 - hashcash windows DLL a hashcash dll for windows
- should make it easier for windows apps to integrate hashcash.
Download the dll and hashcash.lib for
linking (look for hashcash-x.xx-dll.zip).
- 09 Sep 2004 - SpamAssassin 3.0
article on SpamAssassin by Alan Schwarts (it's author) - mentions
new features including hashcash
- 08 Sep 2004 - hashcash 1.05 released CHANGELOG new 1.x release that integrates
Jonathan Morton's libfastmint -- with nice fast C and assembler for
x86 using mmx instructions, and PPC using vector units. Very
- 29 Aug 2004 - .net hashcash
Mitch Denny wrote some
hashcash in C#
- 25 Aug 2004 - debian release -
Hubert Chan (maintainer of
hashcash debian installer) says "now hashcash is in Debian
testing, which means that it will make it into the next stable
release of Debian."
- 24 Aug 2004 - spam assassin book -
spamassassin book including description of how to "to
configure SpamAssassin to work with newer spam-filtering methods such
- 15 Aug 2004 - code update - I updated the hashcash in shell script to support version 1
tokens. (Also fixed the mint function was not working in previous
version, but minting is very slow in sh script anyway so I don't
expect anyone would use it).
- 14 Aug 2004 - related protocol and code - Hal Finney announced and
released the RPOW client and server.
RPOW means Re-usable Proof-of-Work. RPOW servers exchange hashcash
for a form of online verifiable transferable proof-of-work. You
exchange hashcash stamps for RPOW tokens. The RPOW tokens can be
exchanged. An interesting aspect of the RPOW protocol and
implementation is that you do not have to trust the RPOW server not to
cheat (eg by issuing RPOW tokens without corresponding hashcash, or
cheat by allowing selective double spending). This is achieved by
running the RPOW server on IBM tamper resistant PC-on-a-card which has
a software attestation feature similar to Trustworthy Computing
inititative (but used for user verification of server good behavior
rather than usual server control of user machines).
- 09 Aug 2004 - package update - Hubert Chan's
.deb package released to debian unstable.
The debian unstable
hashcash download page. (Next stage is migrate to testing).
- 09 Aug 2004 - new code -
python hascash code released by David McNab <firstname.lastname@example.org>.
Note the code so far appears to be format incompatible with both v1
and v0 hashcash code.
- 08 Aug 2004 - code major new version -
hashcash 1.01 version 1 format code
released in preparation for the imminent debian and
SpamAssassin 3.0 release. And here are the details about the version 1 format changes mainly that it is
extensible, has an explicit field giving it's value, and a separate
counter / collision avoidance field
- 07 Aug 2004 - code update -
0.18 released which adds support for v1 format hashcash stamps
- 11 Jul 2004 - related internet-draft - "SIP Computational Puzzles"
draft-jennings-sip-hashcash-00.txt by C Jennings/Cisco. Proposes
the hashcash thing applied to SIP (Session Initiation Protocol) to
reduce SIP session spamming. Technically it looks like the protocol
is more like Juel's and Brainard's Computational Puzzle than the
interactive version of hashcash .
- 23 Jun 2004 - related tech proposal -- "Coordinated Spam
Reduction Initiative" (CSRI)
proposal by Microsoft. Proposes a number of anti-spam measures,
including using hashcash (with an incompatible format). See section
11 Computational Puzzles for Spam Deterrence.