The phrase "attested commitment" is correct and usable in written English.
It can be used to describe a commitment that has been confirmed or verified, often in a formal or legal context.
Example: "The organization provided an attested commitment to uphold the terms of the agreement."
Alternatives: "verified commitment" or "confirmed commitment".
Three thousand trees planted in the hotel's park attest commitment to the ecology.
But there are indications that change may be coming, as attested by the multiple commitments made in New York, along with a political atmosphere that is becoming more conducive to a new and more powerful international agreement.
I can attest to his commitment in fact as well as words.
Responding to an interview request for this story, he sent an e-mail attesting to his commitment to maintaining the center's architectural character while attracting high-quality retailers, restaurants and entertainment establishments.
The best recommenders will be distinguished former professors, contacts who can attest to your commitment, work ethic, and who also know the field you're applying to intimately.
Riding the Talk: BOR Chair Randy Moore During the discussion that followed, retired Supreme Court judge, Simeon Acoba, Jr., one of the Regents who took the time to attend the meeting even though he is not a member of the Budget and Finance Committee, attested to Board Chair Randy Moore's commitment to doing the right thing.
The Needham, Mass., native showed her dedication and commitment to gymnastics at an early age, and her parents, her coach and Olympic teammates Gabby Douglas, Kyla Ross and McKayla Maroney (as well as fellow "DWTS" contestant Shawn Johnson) all attested to Aly's dedication and development as a performer.
Leucippus (5th c. BCE) is the earliest figure whose commitment to atomism is well attested.
Nothing attests to Sundance's commitment to off-Hollywood more than its documentary selections, which year to year remain its most qualitatively consistent suit.
Not only have Netanyahu and his cohorts systematically been engaged in rancorous public narratives against the Palestinians, but they have taken action that could only attest to his unwavering commitment to expand the settlements and prevent the establishment of a Palestinian state.
