I noticed in the bitcoin wiki script page (https://en.bitcoin.it/wiki/Script) that there were two opcodes named:
It looks like there is another stack that can be used separately as a data store, simply pushing and popping data. I've never heard of this before, but it seems like a very useful feature.
Can anyone verify that this is what the alt stack is actually meant to be used for? If not for just pushing and popping data, what is it for? Do any specific use cases come to mind?