O “se atestigua”. Creo que la frase forma parte de la cláusula “full faith and credit” (“se otorga entera fe y crédito) de la Constitución federal de los EEUU (Article 4, Section 1). Se trata de una especie de patrón uniforme que aparece en los sellos y documentos jurídicos para que los Estados reconozcan la validez jurídica de las decisiones de otros Estados del país. Me sorprende un poco que la fórmula esté incompleta, ya que íntegramente reza: “Full faith and credit”.

http://en.wikipedia.org/wiki/Full_Faith_and_Credit_Clause
The Full Faith and Credit Clause is the familiar name used to refer to Article IV, Section 1 of the United States Constitution, which addresses the duties that states within the United States have to respect the "public acts, records, and judicial proceedings of every other state." According to the Supreme Court, there is a difference between the credit owed to laws (i.e. legislative measures and common law) as compared to the credit owed to judgments.[1] Judgments are generally entitled to greater respect than laws, in other states.[2] At present, it is widely agreed that this Clause of the Constitution has little impact on a court's choice of law decision,[3] although this Clause of the Constitution was once interpreted differently.[4]

Interpretation after ratification of the Constitution
In 1790, shortly after the Constitution had been ratified, Congress took action under the Full Faith and Credit Clause, enacting that "the records and judicial proceedings, authenticated as aforesaid, shall have such faith and credit given to them in every Court within the United States, as they have by law or usage in the Courts of the state from whence the said records are or shall be taken."

http://www.usconstitution.net/xconst_A4Sec1.html
U.S. Const., Article 4, Section 1:
Full faith and credit shall be given in each state to the public acts, records, and judicial proceedings of every other state. And the Congress may by general laws prescribe the manner in which such acts, records, and proceedings shall be proved, and the effect thereof.

Sec. 1739. State and Territorial nonjudicial records; full faith and credit