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import_key "nathan" 5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3
461790ms th_a wallet.cpp:470 copy_wallet_file ] backing up wallet wallet.json to before-import-key-9407629b-1.wallet
false

这个import_key是返回false的,只是在list_my_accounts中能看到了,等看看这实现

_wallet.update_account(account);

不管import成功还是失败都会把帐号数据导入钱包,还在注释里说明了
// @returns true if the key matches a current active/owner/memo key for the named
// account, false otherwise (but it is stored either way)