Each tier claiming requires some fee. That fee will be spend in Crowns. In order to Claim the Tier, the investor has to complete certain tasks within the Seascape Network. The tracking of the tasks are centralized. Therefore in order to verify that investor is eligible to claim the tier, the Lighthouse backend will generate a signature. Which is verified via ecrecover function in the Smartcontract. The server will sign the eligibility of investor with the privatekey which produces Claim Verifier address.