N.Y. Uniform Commercial Code § 3-204 (2026)

Section 3--204. Special Indorsement; Blank Indorsement.
  (1) A special indorsement specifies the person to whom or to whose
order it makes the instrument payable. Any instrument specially indorsed
becomes payable to the order of the special indorsee and may be further
negotiated only by his indorsement.
  (2) An indorsement in blank specifies no particular indorsee and may
consist of a mere signature. An instrument payable to order and indorsed
in blank becomes payable to bearer and may be negotiated by delivery
alone until specially indorsed.
  (3) The holder may convert a blank indorsement into a special
indorsement by writing over the signature of the indorser in blank any
contract consistent with the character of the indorsement.