Is handfasting legal in NY

We were interested in doing handfasting at our ceremony and I was wondering if any others have done that and if it was a legal binding marriage..

well if its a what i have read below I dont see why not
Handfasting Customs
Binding
Often in handfasting there is a part of the ceremony where the couple symbolize their bonds by having a ceremonial cord wrapped around their joined hands. It was this action from which handfasting got its name. The fibers of the cord are often chosen by the couple, with colors that are significant to them, the gods that are being invoked or which match the wedding scheme. The length should be of an appropriate length to wrap around the couple’s hands a few times. The number of strands can be whatever is wished: a single stranded cord, a regular three-strand braid, or a complex braided cording. Patterns or knots may be woven into the cord as desired.

EmberLynn another LIW Bride did this.

Here's a couple of her posts.
She states it's not a legal marriage, but a ritual for engagement, but that may have just been for her.

Here's some of her posts:
PICS
Post

Do a search and you'll find more.

HTH!