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Explanation: alternatively: furnish proof of. That's what the PONS-COLLINS Deutsch-Englisch dictionary says, but I'd say "provide proof".
Nachweis, -e : proof
den ~ für etw erbringen = to furnish proof of sth
Daphne b Sweden Local time: 20:10 Native speaker of: Greek PRO pts in pair: 12
9 mins peer agreement (net): +2
Vesna Zivcic Local time: 20:10 Native speaker of: Croatian PRO pts in pair: 571
Explanation: I agree with all the other suggestions!
You could also use:
... all trainers shall verify their ....
KONSUL-SLOVENIA Slovenia Local time: 20:10 Native speaker of: Slovenian, German PRO pts in pair: 20