Hash instead of login-password?

Question

User identification

I welcome colleagues.

There was an idea of ​​such authorization.
The user enters the site, clicks Create a profile .
The engine generates a hash from a random set of 20 words, for example

7a639b05f08394030e8bd81f411eb44025b0df1d1809d618993f10624a020ace

For authorization in the login field, enter the hash or log in using the link

site.com/login/7a639b05f08394030e8bd81f411eb44025b0df1d1809d618993f10624a020ace

Now I do not take into account the difficulty of storing / remembering the hash.
Interested in how safe it is to use a hash as an authorization instead of a login-password pair?