Online Bitcoin Script simulator or debugger? Is there an online simulator that would allow me to step through, debug, or simulate the execution of a Bitcoin script?
Highly recommend btcdeb by kallewoof. Among other things, you can step through scripts including verify signatures. It is written in c++ and compiles using autotools.

btcdeb

Bitcoin Script debugging utilities.

This is a set of tools used to debug or construct scripts for use in Bitcoin.



btcdeb&gt; help
step     Execute one instruction and iterate in the script.
rewind   Go back in time one instruction.
stack    Print stack content.
altstack Print altstack content.
vfexec   Print vfexec content.
exec     Execute command.
tf       Transform a value using a given function.
print    Print script.
help     Show help information.