This projects counts all the impressions of a BidTorrent publisher. The up-to-date spec is at http://doc.bidtorrent.io/doku.php?id=spec:msg_tracking_impression
Here is an example of working url
http://track.bidtorrent.dev/src/imp.php?a=auction1&p=10&f=0.05&d[1]=0.123-KVco5%2FSeEdbVMHep3a4YMftdd4jOLvdgqhizZKIk4VoGx9ozSDYlirTXa3FTbsytMeyPUL6HZuRwGVVewA4qo7HGe3%2BQGHYRgUb8v%2F2q%2FH26LS%2B8n9dotLc0QVGgIlaNuZG3G08E%2FC2w0MLsALEgqnFpovzhe3nzOapKAZc5XUk%3D
- Key pair generation can be done at http://travistidwell.com/jsencrypt/demo/
- the 'tests' folder contains few utilities to generate signatures and check them