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BitGo BitGo is a high-security multi-sig wallet, which protects your bitcoin from theft and loss. You maintain full custody; BitGo cannot spend or freeze funds. BitGo wallets are easy to use and offer advanced security features such as spending limits and multi-user access.
GreenAddress GreenAddress is a user-friendly multi-signature wallet with improved security and privacy. At no time are your keys server side, even encrypted. For security reasons, you should always use 2FA and the browser extension or Android App.
Bitcoin Knots Bitcoin Knots is a full Bitcoin client and builds the backbone of the network. It offers high levels of security, privacy, and stability. It includes more advanced features than Bitcoin Core, but they are not as well-tested. It uses a lot of space and memory. https://bitcoink