Linen is a wallet that uses Safe smart contracts as its core. The same custody solution that protects over $35b worth of crypto assets for the large crypto asset holders. In the current implementation Linen users protect their assets with 3 private keys and 2 of 3 keys are required to access the wallet. You lose one? You can still access your wallet. Someone steals one? They still can't access it. This is what makes Linen unique. Check of this article to learn more about Linen wallet security.