Hashbot is a forensic web tool to acquire and validate, over time, the status of an individual web page or web document. Follow these steps to acquire a web document: Insert the document’s URL (ie: https://www.evilwebpage.com/image.jpg) in the text input. Select your favorite user agent and click on Submit. A captcha code will be required, for security reason. Validation informations are stored in the -code.txt file in “Validate Info”
Source: https://thehackernews.com/2011/05/hashbot-forensic-web-tool-to-acquire.html