Always when i need free address (not labled) i use:
And i want to know: Can it give me an already occupied address (by label)
I'm worried that I can get an already address in using (by label)
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If you provide an empty string it will return the default account every time. Note
getaccountaddress is deprecated, see https://bitcoincore.org/en/doc/0.16.2/rpc/wallet/getaccountaddress/.
getaccountaddress "account" DEPRECATED. Returns the current Bitcoin address for receiving payments to this account. Arguments: 1. "account" (string, required) The account name for the address. It can also be set to the empty string "" to represent the default account. The account does not need to exist, it will be created and a new address created if there is no account by the given name.