attestation
  證明,證據,證言
  At·tes·ta·tion n.  The act of attesting; testimony; witness; a solemn or official declaration, verbal or written, in support of a fact; evidence. The truth appears from the attestation of witnesses, or of the proper officer. The subscription of a name to a writing as a witness, is an attestation.
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  attestation
       n 1: noun.group:law,;c the action of bearing witness
       2: the evidence by which something is attested