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Proof of Work (PoW) powered blockchains currently account for more than 90% of the total market capitalization of existing digital cryptocurrencies. Although the security provisions of Bitcoin have been thoroughly analysed, the security guarantees of variant (forked) PoW blockchains (which were instantiated with different parameters) have not received much attention in the literature. In this paper, we introduce a novel quantitative framework to analyse the security and performance implicationsdoi:10.1145/2976749.2978341 dblp:conf/ccs/GervaisKWGRC16 fatcat:gw3ucaabsbbynluyvumrnsn3pa