How to modify the proof-environment

Question

I wonder if it's possible to make the QED symbol in the proof environment clickable, to redirect to some given website.
Concretely, the syntax would be something like this:
begin{proof}[Sketch of the Proof.][url="..."]
.
.
.
end{proof}

Willoughby · Accepted Answer

Here's one way of doing it with amsthm's proof environment:
documentclass{article}
usepackage{hyperref}  % For links, provides href
usepackage{amsthm}  % For proof environment
usepackage{amssymb}  % For square symbol
begin{document}
begin{proof}
    renewcommand{qedsymbol}{href{https://tex.stackexchange.com/}{(square)}}
    Test
end{proof}
end{document}

You can then create your own environment that is defined in a similar way:
newenvironment{linkproof}[2][]{%
    begin{proof}[#1]
    renewcommand{qedsymbol}{href{#2}{(square)}}
}{%
    end{proof}
    renewcommand{qedsymbol}{(square)}
}

Which is then used as
begin{linkproof}[ABC]{www.google.com}
    Test
end{linkproof}

You could also edit the definition of proof so it has this behaviour as well.

How to modify the proof-environment

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