Blockchain Without Waste: Proof-of-Stake

Review of Financial Studies, Volume 34, March 2021, Pages 1156-1190

49 Pages Posted: 7 Jun 2018 Last revised: 1 Mar 2021

See all articles by Fahad Saleh

Fahad Saleh

Wake Forest University - Schools of Business

Date Written: July 7, 2020

Abstract

Permissionless blockchains require a protocol to generate consensus. Many prominent permissionless blockchains 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 the 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 are also stakeholders.

Keywords: Blockchain, Consensus, Proof-of-Stake, FinTech

JEL Classification: C70, G00

Suggested Citation

Saleh, Fahad, Blockchain Without Waste: Proof-of-Stake (July 7, 2020). Review of Financial Studies, Volume 34, March 2021, Pages 1156-1190, Available at SSRN: https://ssrn.com/abstract=3183935 or http://dx.doi.org/10.2139/ssrn.3183935

Fahad Saleh (Contact Author)

Wake Forest University - Schools of Business

P.O. Box 7659
Winston-Salem, NC 27109-7285
United States

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