[zmanian]

This is awfully similar to Ben Laurie's good ideas about how to run a distributed time stamping service for a cryptocurrency. http://www.links.org/files/distributed-currency.pdf

Great to see these ideas used for general security applications.

[agl]

(Ben was involved in the design of Roughtime.)

[zmanian]

Just intended to point out this is a great example of the general applicability of crytocurrency inspired research.