will have attested

• future perfect

  future perfect

  Used to describe an action that will be fully completed or achieved by a specific point in the future.

  of attest.
  attest

  verb (used with object)

  to bear witness to; certify; declare to be correct, true, or genuine; declare the truth of, in words or writing, especially to affirm in an official capacity.

Related Words

• authenticate
• corroborate
• demonstrate
• indicate
• substantiate
• swear
• verify