RSA 477:3-a: Recording.

Every deed or other conveyance of real estate and every court order or other instrument which affects title to any interest in real estate, except probate records and tax liens which are by law exempt from recording, shall be recorded at length in the registry of deeds for the county or counties in which the real estate lies and such deed, conveyance, court order or instrument shall not be effective as against bona fide purchasers for value until so recorded.