On Thu, Feb 23, 2017 at 01:28:18PM -0500, G. Andrew Stone wrote: > Can an insertion ordered MMR allow an efficient nonexistence proof? Why do you want a non-existance proof? It supports an efficient *spentness* proof, which is sufficient for what we need in Bitcoin, and much more scalable. -- https://petertodd.org 'peter'[:-1]@petertodd.org