Are all Bitcoin wallets safe?

Crypto-exchanges and -wallets generally do not provide enough insurance and security to be used to store money in the same way as a bank . Not surprisingly, as the value of a bitcoin has increased, so too has the number of viruses designed to steal bitcoin from wallets, as well as cyber attacks against exchanges.

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Can Kraken expire?

Deposit addresses on your account do not expire unless you create more than five of them for the same cryptocurrency. If/when you generate more than this, the oldest deposit address will automatically be set to expire in seven days.

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