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attest

attest - verb

  1. To assure the certainty or validity of: authenticate, back(up), bear out, confirm, corroborate, evidence, justify, substantiate, testify(to), validate, verify, warrant. See support. true.
  2. To confirm formally as true, accurate, or genuine: certify, testify, vouch(for), witness. See affirm.
  3. To give grounds for believing in the existence or presence of: argue, bespeak, betoken, indicate, mark, point to, testify, witness. See show.
  4. To give evidence or testimony under oath: swear, testify, witness. Law depone, depose. See law.