Cornell Professor Emin Gün Sirer notes that “The correctness of the entire Hashgraph protocol seems to hinge on every participant knowing and agreeing upon N, the total number of participants in the system,” which is "a difficult number to determine in an open distributed system.” Baird responded that “All of the nodes at a given time know how many nodes
Z wikipedii https://en.m.wikipedia.org/wiki/Hashgraph