WebHashcash
Beta

Introduction

WebHashcash is a Java-based anti-spam mechanism for collaborative web sites such as weblogs, discussion forums, and wikis, to guard against automated content posting, fake user registration, or ballot stuffing. It adapts the Hashcash email anti-spam system to web forms.

Hashcash is a system designed in 1997 by Adam Back whereby all messages require a modest investment of CPU power in order to generate a "stamp" which will be accepted by the recipient. The CPU processing happens transparently before the user even tries to send his message, and it usually doesn't take more than a few seconds. Thus, a small and easily-verified "postage" is attached to all messages. This cost is negligible for legitimate users, but prohibitive for spammers, thereby destroying the economics of spamming.

Click here to view instructions for installation onto your web site.