How do Jehovah Witness determine who is the 144 K ? Did Jesus drop off a book in 1914 with the names ?

Seriously, who has the book of names of the 144 thousand ? Or is is a feeling each of the heavenly class seem to get ?
What is the official Organizations declarations of who is in the 144 thousand ?

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VPN is (Virtual Private Network) were first used by companies to enable their employees to securely access internal systems such as email remotely (e.g. from home or while on business trips). Today they are increasingly being used for personal use by individuals to protect their privacy while online in public places (e.g. when using the wi-fi connection in a cafe) or in a country where the internet is censored / blocked (e.g. China, Saudi Arabia…).