Oh ok you mean a semantic difference for the purpose of explaining. It doesn't actually change the code.Regarding saving more bits, there really isn't much room if you consider time-based relative locktimes and long-lived channels on the order of a year or more.On Thu, May 28, 2015 at 8:18 AM, Tier Nolan <tier.nolan@gmail.com> wrote:------------------------------------------------------------------------------On Thu, May 28, 2015 at 3:59 PM, Mark Friedenbach <mark@friedenbach.org> wrote:I meant whatever the next version is, so you are right, it's version 2.Why 3? Do we have a version 2?
As for doing it in serialization, that would alter the txid making it a hard fork change.
The change is backwards compatible (since there is no restrictions on sequence numbers). This makes it a soft fork.
That doesn't change the fact that you are changing what a field in the transaction represents.You could say that the sequence number is no longer encoded in the serialization, it is assumed to be 0xFFFFFFFF for all version 2+ transactions and the relative locktime is a whole new field that is the same size (and position).I think keeping some of the bytes for other uses is a good idea. The entire top 2 bytes could be ignored when working out relative locktime verify. That leaves them fully free to be set to anything.
It could be that if the MSB of the bottom 2 bytes is set, then that activates the rule and the top 2 bytes are ignored.Are there any use-cases which need a RLTV of more than 8191 blocks delay (that can't be covered by the absolute version)?
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