"certifying" in the verb sense
1. attest, certify, manifest, demonstrate, evidence
provide evidence for stand as proof of show by one's behavior, attitude, or external attributes
"His high fever attested to his illness"
"The buildings in Rome manifest a high level of architectural sophistication"
"This decision demonstrates his sense of fairness"
guarantee payment on of checks
3. license, licence, certify
"I am licensed to practice law in this state"
4. certify, endorse, indorse
guarantee as meeting a certain standard
"certified grade AAA meat"
declare legally insane
Source: WordNet® (An amazing lexical database of English)
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