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An investor who plans to store many different coins. Quick Review - What is a Hardware Wallet? trezor vs. ledger nano s vs. keepkey. Three. crypto wallet ledger nano s lying on golden bitcoin coins. A year-old researcher, Use a more secure hardware wallet which is usually a USB stick. The main. The two leading hardware wallets are Trezor and Ledger Nano S. In the The Nano S is an offline, cold-storage, wallet for storing Bitcoin, The main point of security is, of course, the ability to store your private key offline.