N.Y.C. Admin. Code § 11-331: § 11-331 Records to be competent evidence.

The record in the office of the commissioner of finance or his or her designee of sales of tax liens, of a tax lien certificate, and of a copy of a tax lien certificate, and of an assignment of a tax lien certificate, a record of a tax lien certificate in the office of a recording officer, and of an assignment of tax lien certificate, duly acknowledged, in the office of a recording officer, shall each be evidence in any court in the state without further proof. A transcript of any record enumerated in this section, duly certified, shall be evidence in any court in the state with like effect as the original instrument of record.