Don't ever worry about that (unless of course it is affecting your food, rent or bills). You'll never be obliged to have "proof of current compensation" - so chalk it up to "paying dues" at the current company and if you are dissatisfied start actively interviewing elsewhere now.
I've found the old mentality of "find a job, make it a career and then move up the company's internal hierarchical ladder over the years" - is not the best for technologists. Back when I was a junior-to-mid dev(2010ish?) I was able to double my salary in two years by finding the right new role every year.
Only relevant link I could find talking about the pro's of "job-hopping":
http://www.daedtech.com/notes-on-job-hopping-you-should-probably-job-hop
I also believe if you get too comfy at a job, you'll lose the motivation to keep your skills sharpened. The max I'll stay at any one company is 2 years.