Primarily the Smart Actuary (set of Smart Contracts) seeks proof of life (rather than proof of death) by sending notifications to the user requesting regular check-ins using biometric to authenticate members and confirm their "liveness". There are several solutions for this referenced in the whitepaper.

We will also connect to third party oracles which can provide authoritative death notices. There are many projects developing these at the moment but we will also develop our own.

An example would be an oracle that tracks the US Social Security Death Index