when you have proved you can do the job vs when you are proving you can do the job

Some examples from the web:

• You have proved you are not completely free from evil,
• You have proved your superior intellect...
• You have proved your valor yet again, Maximus.
• You have proved the conceit possible.
• Good Sir Knight, you have proved your worth on the field of honour.
• You have proved your point, professor.
• You have proved your superior intellect... and defeated the plans of Admiral Kirk.
• Mr Reinfeldt, you have proved there are no easy answers to difficult questions.
• We just proved you can get the job done standing in the same spot.
• By your example you have proved that poverty and social exclusion do not have to be synonyms of Roma communities.
• Still, you have proved yourself useful these past few months, Wormtail.
• Well, Mr. Cafmeyer, you have proved that my original hunch was correct.
• and today you have proved this silly thing
• Some say that it is not possible to fall in love with Europe; you have proved the opposite.
• Mr Barroso, you have proved many times that you treat Member States fairly.
• I see you have proved it is possible to say many things in a short space of time, and I thank you accordingly.
• In Belgium, you have proved yourself able to breathe new life into politics.
• - Sir. I was sure today couldn't get any worse, and I see you have proved me wrong.
• By then, I will have proved I can do the job,
• But I have proved you wrong.

Some examples from the web:

• Now you are proving you are insane.
• If it's trespassing or climbing, they'll have a job proving it.
• If it's trespassing or climbing, they'll have a job proving it.
• But you, Lars, you are proving quite resourceful.
• (Mixed reactions) ... you see, you are proving the truth of what I am trying to say.
• In the Commission's view, are these protectionist measures slowing the European Union's growth, the current rate of which is not proving sufficient to create jobs and cut unemployment?
• The job I'm on is proving harder to accomplish than I thought.
• The job I'm ons proving harder to accomplish than I thought.
• Your honor, we are proving blatant product malfeasance.
• The old games are proving less and less effective.
• All of whom are proving extremely difficult to unmask.
• It appears that the monies pledged by the international community for the reconstruction of Afghanistan are proving inadequate.
• For the building sector the directives are proving disastrous.
• They have failed to provide stability and are proving extremely two-faced.
• ...are proving promising in several different areas.
• We are proving that we can be proactive, solve problems and act on new ideas.
• It is mainly the indirect labour costs that are proving pernicious in Europe.
• Yes, because European Union countries are proving that they do.
• The current safety measures concerning liquid restrictions on flights are proving costly for passengers.
• In the present crisis, many such transactions are proving to be flawed.