Bitcoin logo in LaTeX? Is there a fairly simple way to include a standard-looking but not too elaborate "Bitcoin accepted here" logo in a LaTeX document?
Yeah, check out this answer on tex.

% arara: lualatex

\documentclass{article}
\usepackage{fontspec}
\usepackage{fontawesome}
\def\faBtc{\FA\symbol{"F15A}}
\usepackage{tikz}
\usetikzlibrary

{positioning}
\newcommand{\bitcoin}{%
    \begin{tikzpicture}
\foreach \i in {0,100}{
    \node [circle, fill=orange!90!white!\i, font=\large, inner sep=0.25ex, rotate=-15, text=white] 
    (symbol) at (-1.25,1/8+\i/4000) {\faBtc};}
    \end{tikzpicture}}
\usepackage{mathtools}
\usepackage{siunitx}
\DeclareSIUnit{\btc}{\ifmmode\text{\faBtc}\else\faBtc\fi}

\begin{document}
\SI{1000000}{\btc}
\bitcoin
\end{document}