If you speak with Rank Officer Friga in Thurgadin and ask for a progress report she will tell you how many bounties you have claimed. I was too lazy to type it out, so I just took a log file.
[Thu Nov 13 20:45:24 2014] You say, 'Hail, Rank Officer Friga'
[Thu Nov 13 20:45:24 2014] Rank Officer Friga says, 'Hail, Hunter Soric. You currently have 24 Third Rank, 36 Second Rank, and 28 First Rank Bounty Tokens.'
[Thu Nov 13 20:45:24 2014] - [D1] I'd like to see my progress report.
[Thu Nov 13 20:45:24 2014] - [D2] I'd like to put in for a promotion.
[Thu Nov 13 20:45:27 2014] You say, 'I'd like to see my progress report.'
[Thu Nov 13 20:45:27 2014] Rank Officer Friga thumbs through some files. 'Here it is, the official
Thurgadin Bounty Hunting report for Hunter Soric.'
[Thu Nov 13 20:45:27 2014] Soric - Third Rank Bounty Hunter.
[Thu Nov 13 20:45:27 2014] Total bounties claimed: 99. Breakdown:
[Thu Nov 13 20:45:27 2014] First Rank bounties: 33
[Thu Nov 13 20:45:27 2014] Second Rank bounties: 42
[Thu Nov 13 20:45:27 2014] Third Rank bounties: 24
[Thu Nov 13 20:45:27 2014] Bounty Tokens earned: 111
If this information is accurate, it should be possible to have leader board for various bounty hunting stuff.