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Bitcoin hardware wallet manufacturer Ledger is one of the technology leaders in digital currency security, providing consumers and businesses with trusted hardware. Ledger is a Bitcoin hardware wallet based on smart cards that provides the highest level of protection, usability and control. Ledger Hardware Wallet is a multi-functional wallet, a hardware device that securely stores private keys. When viewing the wallet and sending transactions, the hardware wallet needs to be used in conjunction with the software wallet. At the same time, it supports secure storage of Bitcoin, Ethereum and platform tokens, Zcash, etc. Its projects are already open sourced on Github. Based on its hardware device, you can use either software wallets developed by Ledger or software wallets developed by other teams, that is, you can use Ledger with the Ethereum web wallet MyEtherWallet or Parity wallet. Ledger has issued 2 hardware wallets: Ledger Nano S, Ledger Nano X.