attest
verb
formal uk/əˈtest/ us [ T ] LAW
to sign a document to show that you were present when it was signed by someone else:
The will must be attested by two witnesses.
The statement was signed and attested by a high court judge.
[ I ] LAW
to say officially that something is true or accurate:
attest to doing sth Couples must attest to being in a committed relationship.
attest to sth The commission demands that Chief Financial Officers personally attest to the accuracy of their financial statements.
[ I ]
to show that something is true:
attest to sth The decline in sales attests to the fact that the product is out of date.
attestation
noun [ C or U ]
The report contains an auditor's attestation.