VERIFYING
collateral, confirmative, confirming, confirmatory, corroborative, corroboratory, substantiating, substantiative, validating, validatory, verificatory, verifying
(adjective) serving to support or corroborate; “collateral evidence”
Source: WordNet® 3.1
Verb
verifying
present participle of verify
Source: Wiktionary
VERIFY
Ver"i*fy, v. t. [imp. & p. p. Verified; p. pr. & vb. n. Verifying.]
Etym: [F. vérifier, LL. verificare, from L. verus true + -ficare to
make. See Very, and -fy.]
1. To prove to be true or correct; to establish the truth of; to
confirm; to substantiate.
This is verified by a number of examples. Bacon.
So shalt thou best fulfill, best verify. The prophets old, who sung
thy endless reign. Milton.
2. To confirm or establish the authenticity of by examination or
competent evidence; to authenciate; as, to verify a written
statement; to verify an account, a pleading, or the like.
To verify our title with their lives. Shak.
3. To maintain; to affirm; to support. [Obs.] Shak.
Source: Webster’s Unabridged Dictionary 1913 Edition