SPECTRE: Serialization of Proof-of-Work Events, Confirming Transactions via Recursive Elections.
A Fast and Scalable Distributed Ledger Protocol
(by Yoad Lewenberg, Yonatan Sompolinsky, and Aviv Zohar)

https://medium.com/@avivzohar/the-spectre-protocol-7dbbebb707b5#.maypst90g

Is this the same DAG protocol iota uses?