N.Y. Pers. Prop. Law § 47-b

§ 47-b. Filing, entering and indexing. 1. The filing officer shall\nmark upon the assignment or true copy thereof filed with him the date of\nits filing and shall file such assignment or true copy thereof in his\noffice for public inspection. He shall keep a separate book in which he\nshall enter the names of the assignor and assignee, the date of its\nfiling, its filing number and the date of cancellation thereof, or of\nits vacation by order of the court. Such book shall be indexed\nalphabetically under the names and changed names, if any, of both\nassignor and assignee.\n 2. A county clerk may adopt a new indexing system utilizing\nelectro-mechanical, electronic or any other method he deems suitable for\nmaintaining the indexes.\n