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BIP 32 Watch-Only Wallets allows you to create a tree of keys from a single seed. Watch only wallets are perfect for users who want a wallet to receive new coins easily but don't want to spend regularly from that wallet, similar to a savings account. HD wallets (Hierarchical Deterministic) made the backup process a lot easier and safer and safer than using the same address again and again. A full watch-only wallet is much better and safer. This is because using new addresses enhances privacy.
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