Electrum
Open SourceElectrum is a free and open-source Bitcoin wallet renowned for its speed, low resource usage, and strong security features. It runs on various operating systems and supports hardware wallets for enhanced protection.
Key Features
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High level of security with client-side private keys and hardware wallet support.
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Extremely fast startup and synchronization due to lightweight SPV architecture.
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Full control over transaction fees and the ability to use RBF.