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Re:Sony agrees to pay millions to gamers to settle PS3 Linux... by ars on Tuesday June 21, 2016 @03:24PM (#11948665)
You don't need proof as in mathematical proof.

You need proof as in legal proof, i.e. a paper saying "I used it".

Re:Sony agrees to pay millions to gamers to settle PS3 Linux... by codys on Tuesday June 21, 2016 @04:21PM (#11949099)
Attestation ("I used it") and "proof" are used separately in the quote from the article, implying that the proof must be more that just attestation.