On Thu, May 19, 2016 at 04:23:28PM -0600, Nick ODell wrote: > What if two people create transactions from oupoints within the same MMR > tree tip, at the same time? > > For example, I create transaction A plus an MMR proof that MMR tip X will > become Y. > > On the other side of the planet, someone else creates transaction B, plus > an MMR proof that tip X will become Z. > > Can a miner who receives A and B put both into a block, without access to > the outputs that were pruned?
The MMR proofs provided by transactions aren't proofs of *how* the MMR should be be changd; they're just proofs that the MMR is in a certain state right now. You're situation is just an example of a double-spend, that miners have to detect if they don't want to create invalid blocks. Specifically, if I understand your example correctly, they'd be rejected by the STXO set. -- https://petertodd.org 'peter'[:-1]@petertodd.org
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