Ovia Seshadri Vinay J. Ribeiro Shadab Zafar Securely Improving Stability and Performance of PoW Blockchains Using Anchors. 147-155 2022 COMSNETS https://doi.org/10.1109/COMSNETS53615.2022.9668572 conf/comsnets/2022 db/conf/comsnets/comsnets2022.html#SeshadriRZ22