I read somewhere here Viz saying that Merkle tree implementation in Nexus is in development, is this Merkle tree signatures what he was talking about?
SigmaX/Curecoin 2.0 will be using Merkle trees of Lamport signatures, Viz's implementation may (probably) differs it would be best to ask him to expand on his ideas but the basic principal is the same yes. I highly encourage anyone interested in cryptography to read the CC white paper it is very informative.