Interesting, though it doesn't seem to work with your user name? Is the star burst supposed to appear over the D? For me, it appears after the D; I'm using Google Chrome on Windows.
There's also the possibility of using the
Combining diacritical marks to cobble something together. I did this with the D in my user name, but haven't found something that'd really work as Bitcoin symbol, mostly because the symbols don't seem to line up properly:
B ̳ B ̶ B ⃦ B ⃝
Edit: Found a regular Unicode character that may work, although it doesn't look that good at small sizes:
Ⓑ Ⓑ Ⓑⓑ ⓑ ⓑ