Ethereum Issues Security Alert After Fork, Transactions May Be Reverted Nov 26, 2016 by Olusegun Ogundeji Geth's implementation of EIP161 was flawed during the hard fork, Gavin Wood doubts that Ethereum will be switching to PoS on the prescribed schedule of Feb 2017. 1313
Ethereum Hard Fork Meant to Protect Against Attacks Coincides With Yet Another EXP Attack Oct 19, 2016 by Olusegun Ogundeji There seems to be a new attack on the Ethereum platform, barely 24 hours into its scheduled hard fork. 531