What prior work influenced the design and layout of the Script instruction set?
Based on the locations of
OP_RESERVED2, it seems that the Bitcoin instruction set may draw on large segments of some earlier work.
There may have been a research paper or essay about a "Security Forth" published in the early 2000s which shared unusual similarities with the Bitcoin instruction set (like
OP_3DUP operations). Though in recent years, no one has been able to locate a copy of this work.
What was the title of that work? Where was it published? Can anyone find a copy?