I. Introduction
The blockchain technology as introduced by Satoshi Nakamoto for Bitcoin [1] uses Proof-of-Work (PoW) as a means of reaching consensus and securing a shared ledger on a decentralized peer-to-peer (P2P) network. While the “longest chain wins” rule of PoW allowed the network to resist Deny-of-Service and double-spending attacks, it has since been criticized for its scalability in terms of transaction processing and its electricity consumption [2] , leading to the creation of new consensus models seeking to go past the limitations of PoW.