In the response of the timeline request, the users under globalObjects have a property _ext_is_blueverified that tells if they have a blue check or not. (In that response, the verified property of the users seems to always be false, so not useful).
In the response of the profile request, under result there is a _is_blueverified property that tells if the user has a blue check or not. (In that response, the verified property under legacy also seems to always be false, so not useful).
In the response of the graphql TweetDetail request, under result there is a _is_blueverified property that tells if the user has a blue check or not. (In that response, the verified property under legacy also seems to always be false, so not useful).
In the response of the timeline request, the users under globalObjects have a property _ext_is_blueverified that tells if they have a blue check or not. (In that response, the verified property of the users seems to always be false, so not useful).
In the response of the profile request, under result there is a _is_blueverified property that tells if the user has a blue check or not. (In that response, the verified property under legacy also seems to always be false, so not useful).
In the response of the graphql TweetDetail request, under result there is a _is_blueverified property that tells if the user has a blue check or not. (In that response, the verified property under legacy also seems to always be false, so not useful).