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How to import a wallet through a private key string?

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# What problem does this feture solve? # Describe what you've considered? # Code sample / Spec I have a private key string "Ky7VymVZ6fugetBJZkr7bEhWsYTXdGU3JmV8cSgG9ZRXThf8g2u4",I need import it,but i not found...

How to generate another new address by a existed wallet?

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# What problem does this feture solve? # Describe what you've considered? # Code sample / Spec I want to generate another new address by a existed wallet,but i don't...