GLACIER

Many people who choose self-managed storage (as opposed to an online storage service) use "hardware wallets" such as the Trezor, Ledger, and KeepKey to store their bitcoins. While these are great products that provide strong security, Glacier is intended to offer an even higher level of protection than today's hardware wallets can provide... Glacier doesn't depend on any service or third-party to store your Bitcoin keys. You can protect your keys without having to trust others or pay them any service fees. Glacier also provides different ways to store your keys offline, making it flexible... The Glacier protocol covers bitcoin storage, not procurement. It assumes you already possess bitcoins and wish to store them more securely.