The phrase "attested before" is correct and usable in written English.
It can be used in legal or formal contexts to indicate that something has been confirmed or verified in the presence of a witness or authority.
Example: "The document was attested before a notary public to ensure its authenticity."
Alternatives: "verified in front of" or "confirmed before".
I was enlisted and attested before I did know And to the Royal Barracks they forced me to go.
Trierarchs, who are not specifically attested before the middle of the century, were wealthy individuals who, as a kind of prestige-conferring tax payment, paid for the equipping of a trireme (the state provided the hull).
The town dwellers, identified as the original Semitic population, can, for the sake of convenience, be called Canaanites, although the term is not attested before the middle of the 2nd millennium bce.
Princet's presence in Picasso's bande is only sketchily attested before the key year of 1906-7, and the teaching role Miller wants him to have had in 1907 is detailed only in a contemporary's memoir, which describes an event no earlier than 1909.
Hemming may have invented Eadric's byname of Streona, as it is not attested before appearing in Hemming's work.
A notable characteristic, which has not been attested before in Constantinopolitan art and architecture, is the extensive use of Sassanid Persian decorative motifs such as friezes of running palmette and pomegranate leaves or symmetric geometric and vegetal patterns.
In this scenario, the software state of the embedded device is attested using the TPM before sensitive information is transmitted.
Aslan gives numerous examples of Jewish, anti-Roman, and violent individuals who are historically attested to in the period before and after the life of Jesus.
It is a striking observation, however we explain it, that the forms of particular things which coexist in the mind of Origen's God with the genera and species are not attested in any pagan Platonist before Plotinus, his younger contemporary and (as most believe) a fellow-pupil of Ammonius Saccas (cf. Plotinus, Enneads 5.7).
Some of the spells introduced at this time claim an older provenance; for instance the rubric to spell 30B states that it was discovered by the Prince Hordjedef in the reign of King Menkaure, many hundreds of years before it is attested in the archaeological record.
Pope Alexander IV and others attested that they had seen these marks both before and after Francis's death.
