attest

attest (http://definr.com/attest)

     v 1: provide evidence for; stand as proof of; "His high fever
          attested to his illness"; "The buildings in Rome
          manifest a high level of architectural sophistication"
          [syn: certify, manifest, demonstrate, evidence]
     2: authenticate, affirm to be true, genuine, or correct, as in
        an official capacity; "I attest this signature"
     3: give testimony in a court of law [syn: testify, {take the
        stand}, bear witness]
     4: establish or verify the usage of; "This word is not attested
        until 1993"