has proved vs has proven

Some examples from the web:

• [Forbes]. The African Union, in fact, has proved itself both unwilling and, when it does attempt to act, incompetent to deal with sub-Saharan Africa's chronic crisis.
• 2.1 [ no object, with complement ] Be seen or found to be: the scheme has proved a great success. More example sentences. Completeness, however, is an ...
• Aug 21, 2010 ... One can say either, He has proved his theory, or He has proven his theory. According the OED, proven is “the usual form [of the past participle] ...
• Mar 31, 2016 ... How Trump Has Proved the Founders Right. They feared demagogues for a reason. Restore the Electoral College to its purpose! By H.W. ...

Some examples from the web:

• Neem has proven nitrification inhibition properties.
• This alone has proven incredibly successful.
• My wicked life has proven empty.
• Sophia has proven herself far from trustworthy.
• This group has proven difficult to locate, Chad.
• This has proven counterproductive for the confidence of depositors and may have exacerbated the problems.
• Luciano has proven himself a skillful leader and effective negotiator.
• Lennox Lewis has proven he's the champion.
• Russian air activity has proven just as impregnable as their ground force.
• And history has proven that to be something far more powerful.
• Your advanced technology has proven inadequate?
• Cinema history has proven him wrong.
• The revised Stability and Growth Pact has proven to work rather well.
• ERGEG is currently based in Brussels and has proven to work efficiently.
• Historically, quarantine has proven very effective in limiting the transmissions of communicable diseases.
• History has proven over and over again.
• Time has proven that to be true.
• The girl has proven herself a good servant.
• Chuck Bartowski has proven to be a major threat to... national security.
• This house has proven to be full of surprises here.