Vouch is a verb

vouch
/vouCH/

intransitive verb

1. a: to supply supporting evidence or testimony
   “Vouch licenses vouch for your privileges to access, use, and transact with shared devices.”
   b: to give personal assurance
   “Vouch exposes the chain of responsibility that ties a privilege on a device back to the humans, AIs, and organizations that vouched for the device.”
2. to give a guarantee : become surety
   “Vouch licenses act as a self-evident proof that carry privileges that can vouch for their authenticity without requiring a third party.”

transitive verb

1. to summon into court to warrant or defend a title
   “In-persons endorsements are required establish identity and ownership of titled assets before Vouch Licenses are able to vouch the owner’s privileges with that asset.”
2. a: prove, substantiate
   “The Vouch license vouched my identity and access even without internet on the basement level of the garage.”
   b: to verify (a business transaction) by examining documentary evidence
   “Device-to-device transactions initiated with a Vouch License adds pre-validated identity data that vouches that transactions are not fraudulent.”

• Merriam-Webster (and a little Scarlet Dame)