When building usage-based decentralized car insurance, we hit an old problem. Insurance companies want to see high-definition dashcam videos to verify claims, but users simply don't want to expose their location data. This contradiction is almost unsolvable—until we came across the Walrus solution.

The core idea is actually quite simple: at the moment of an accident, the onboard device captures a video clip, encrypts it locally, and then uploads it to Walrus's distributed network. The clever part is that, although the video resides on public nodes, no one can view it—it's in a completely encrypted state.

The real innovation lies in the Sui smart contract. We write conditional decryption logic on-chain. The system will only decrypt if two conditions are met simultaneously: first, an oracle confirms that a collision has truly occurred; second, the user actively submits a claim. Once these two conditions are satisfied, Walrus's validator node network collaborates using threshold encryption techniques to compute the decryption key and hands it over to the claims reviewer.

This is what we call "on-demand disclosure"—the user's privacy rights are directly embedded into the code. When there's no claim event, your video remains an absolute black box. When needed, evidence can be swiftly delivered through the decentralized network to where it should be. This balance of trust and privacy is something traditional centralized cloud storage can never achieve.