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From: Luke Dashjr <luke@dashjr.org>
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Date: Tue, 12 May 2015 20:38:27 +0000
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Subject: Re: [Bitcoin-development] CLTV opcode allocation; long-term plans?
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It should actually be straightforward to softfork RCLTV in as a negative CLTV.
All nLockTime are >= any negative number, so a negative number makes CLTV a
no-op always. Therefore, it is clean to define negative numbers as relative
later. It's also somewhat obvious to developers, since negative numbers often
imply an offset (eg, negative list indices in Python).
Luke
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