The real danger here is that citing webpages creates significant risk that the content will be altered in future. For example, to re-write a portion of history

The real danger here is that citing webpages creates significant risk that the content will be altered in future. For example, to re-write a portion of history: 1. Scan wikipedia for any broken links 2. Purchase domains 3. Reinstate links with different content 4. Update wikipedia article to represent changed content We need a method of publicly verifying the contents of a link at the time it was cited. Could we do something similar to bitcoin? Where we have a publicly available hash of each site when cited?