What's inside base64?

Question

Cryptography

Hello.
Help me understand what is inside the base64 wrapper and how it is encoded, because the data is partially displayed ...
Maybe this is a problem with the encoding?

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-_bdBZIBDTUuMTAxLjE3Mi4xNDaaAQ01LjEwMS4xNzIuMTQ2ogEHRW5nbGFuZA==

Answer 1

It simply encoded binary data.

Answer 2

Characters -_cannot occur in base64. Maybe it's a separator?
If you take only the part of the string after the underline, the equal signs are superfluous, because with them, the length is 62, and must be divisible by 4, i.e. 60.
The length of the entire line is 888 characters. Nice number )
Any other information about this line?