Blockchain Without Waste: Proof-of-Stake
46 Pages Posted: 7 Jun 2018 Last revised: 16 Jan 2020
Date Written: January 15, 2020
Permissionless blockchains require a protocol to generate consensus. Many prominent blockchains (e.g., Bitcoin and Ethereum) employ Proof-of-Work (PoW) for that purpose, but PoW possesses significant shortcomings. Various alternatives have been proposed. This paper provides the first formal economic model of the most famous alternative, Proof-of-Stake (PoS), and establishes conditions under which PoS generates consensus. A sufficiently modest reward schedule not only implies existence of an equilibrium in which consensus obtains as soon as possible but also precludes a persistent forking equilibrium. The latter result arises because PoS, unlike PoW, requires that validators hold stake.
Keywords: Blockchain, Consensus, Proof-of-Stake, FinTech
JEL Classification: C70, G00
Suggested Citation: Suggested Citation