attest [attested, attesting, attests](to affirm to be correct, true, or genuine) verb [UK: ə.ˈtest] [US: ə.ˈtest]
testify [testified, testifying, testifies](to make a statement based on personal knowledge or faith) verb [UK: ˈtest.ɪ.faɪ] [US: ˈtest.ə.ˌfaɪ]I can testify to that. = Yo puedo atestiguar eso.