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Light-node wallets rely on other full-node wallets on the blockchain to synchronize only their own data, thus partially centralizing. For example, our commonly used Bitcoin wallet is a light node wallet, when using these wallets, only download the data related to their own Bitcoin account, download hundreds of G of data is not realistic.

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The full node needs to download new chunks that periodically appear and upload them further to other required nodes. For today's 7TPS Bitcoin blockchain, the average download bandwidth consumption is 13.6Kbps, which is not a burden at all. But if TPS is raised to 7000TPS, it will require at least 13.6Mbps of download bandwidth to withstand - note that this is critical data and orderly, and if block data is not transmitted in a timely manner, the blockchain will not be able to continue to construct and the network-wide book status cannot be rebuilt.

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Like Bitcoin's core wallet, Electrum Wallet allows users to control their own funds and private keys. Electrum wallets' private keys can also be exported and used on other supported wallets to access funds. Electrum apps are available for Windows, Linux, OSX and Android, but do not support iOS and browser clients.

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Electrum is a popular software wallet that works by connecting to a dedicated server. These servers receive a hash of the Bitcoin address in the wallet and reply with transaction information. Electrum Wallet is fast and has few resources, but by default, it connects to these servers and can easily monitor users. In addition to Electrum, some other software uses public Electrum servers. By 2019, it is a faster and better alternative to BIP37.