Court battles continued, but with the intervention of the Prime Minister, Mr Jim Bolger, a non-binding agreement was signed in 1996. This was followed by the signing of the Deed of Settlement in 1997, and the passage of the Ngāi Tahu Claim Settlement Act in 1998. The main points agreed to by the crown were to allow Ngāi Tahu to express its traditional relationship with the environment, to issue an apology, grant Ngāi Tahu $170 million and return ownership of pounamu. To enroll as a beneficiary of Ngāi Tahu claim prospective tribe members must prove descent from those members alive in 1848. The list of 1848 living members (the 'Blue Book') was put together in the late 1800s when the fulfillment of the claim seemed imminent.