Online Bitcoin Script simulator or debugger?

[Geremia]

Is there an online simulator that would allow me to step through, debug, or simulate the execution of a Bitcoin script?

[achow101]

Is there an online simulator that would allow me to step through, debug, or simulate the execution of a Bitcoin script?

Try this one: https://webbtc.com/script/

If you want a program that is also good for this, checkout hashmal: https://bitcointalk.org/index.php?topic=1168604

[Geremia]

I also discovered this

http://www.cs.princeton.edu/~tongbinw/bitcoinIDE/build/editor.html

courtesy StephenM347 on Bitcoin StackExchange.

[CIYAM]

Most of the online ones that I have played with have bugs (including those linked) so don't rely on them for anything very important.

Best to play with Bitcoin using "-regtest" for prototyping of actual scripts (the debug.log can help with working out why scripts have failed).

[Geremia]

Best to play with Bitcoin using "-regtest" for prototyping of actual scripts (the debug.log can help with working out why scripts have failed).

How do I use that? Where is it documented? thanks

[achow101]

Best to play with Bitcoin using "-regtest" for prototyping of actual scripts (the debug.log can help with working out why scripts have failed).

How do I use that? Where is it documented? thanks

Start Bitcoin Core with the -regtest flag in the command that starts it. Mine some regtest coins and then create your transaction by hand. Push it through your Bitcoin Core and see if it transacts or not.