BibTeX, biblatex and biber ⇒ Bold Citation Numbers

[citizen_of_utopia]

I would like my citation numbers to be in bold.

I always use number, e.g. [1], [2] and [3].

But I would like the numerals to be bold: [1], [2] and [3].

I've tried everything. I even created my own .bst file.
I opened a CMD window in Windows and then typed latex makebst.
I answered a long list of multiple choice questions, and the output was a .dbj batch file.
I compiled that file and the output was my own personal .bst which I use with my own .bib database.

There was option to change the citation style, except for numerical or alphanumerical.

Does anyone know how to get the numerals in bold?
If I need to edit my .bst file then please explain step-by-step.

I hope someone can help.