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, Comparaison between Proof-of-Work and Proof-of-Stake in Bitfury Group Presentation of some altcoins with their protocols are developed in Bitfury Group, p.see also ECB, 2015.

. Guégan, For information on the rules considered in US and Europe concerning Blockchain until december 2017 we refer to Blemus (2017) Some properties of blockchain are investigated in Cronan, p.Shermin, 2015.

, Bitfury group (2015) Proof of Stake versus Proof-of-Work

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