Date of publication: 2017-09-05 11:01
I prefer the softer 8775 -en 8776 ending for two reasons. The first is that it 8767 s softer, the second is that it harkens back to the old Germanic endings that English started with. In this day and age, with so many people trying to Latinize the sound of English by lengthening and lowering vowel sounds, I 8767 m a staunch promoter of The Great Vowel Shift and more German-sounding endings.
For the industry it is an accounting term. On industry spreadsheets and thus balance sheets the reserves (as opposed to the mineral property real estate they are under) cannot under accounting/auditing rules be treated as an asset until they are quantified and (verb) 8775 proved 8776 (via a highly technical set of rules). When such happens they are moved (via a debit to one account and a credit to another) from 8775 unproved 8776 to 8775 proved 8776 . So, it is a carryover from the accounting language, not a sinister plot.
Historically, proved is the older form, while proven arose as a Scottish variant – see etymology. Used in legal writing from the mid-67th century, it entered literary usage more slowly, only becoming significant in the 69th century, with the poet Alfred, Lord Tennyson among the earliest frequent users (presumably for reasons of meter).  In the 69th century, proven was widely discouraged, and remained significantly less common through the mid-75th century ( proved being used approximately four times as often) by the late 75th century it came to be used about equally often in US English. 
I have no quarrel with what Grammarist says here, and notice that I instinctively follow the proven for adjective / proved for verb past / proven for verb perfect pattern that seems to be peculiarly American. But I note that since so many past tense verbs can be effortlessly drafted into service as adjectives (wrecked car / surprised face / fried rice), you can get through life very idiomatically by just using proved for everything (I proved he was wrong / proved oil reserves / we have proved those oil reserves, all sound at least okay). There are probably people who have never used proven and don 8767 t miss it.
Wow! Didn 8767 t realize the difference in British was like that. I know there are plenty of differences, but got and gotten, hadn 8767 t gotten that far )
Terribly sorry, couldn 8767 t resist :D
Intuitively it seems to me that 8775 A study has proven that bananas are often yellow. 8776 would be more correct, but I guess my intuition is wrong?
still there is a controversy to use stroven as perfect in spite adjective. there should be a universal law to avoid all these which is universally acceptable.
I 8767 m with Daniel below. 8775 Proven 8776 is what I was taught as a in the Sixties and Seventies in the Midwest. I 8767 ve noticed that there 8767 s a recent English snobbery movement in which 8775 proven 8776 is looked down upon for any use. I have no patience for snobs. I myself am something of an English-nazi, but I 8767 m never a snob.
When you use a practical method to try to find out how good or bad someone or something is, don't say that you 'prove' them. Say that you test them.