establish or strengthen as with new evidence or facts

establish the authenticity of something

capable of being tested (verified or falsified) by experiment or observation

capable of being verified

serving to support or corroborate

additional proof that something that was believed (some fact or hypothesis or theory) is correct

someone who vouches for another or for the correctness of a statement

put a check mark on or near or next to

be careful or certain to do something; make certain of something

verify by consulting a source or authority