Template-Type: ReDIF-Paper 1.0 Author-Name: Rodney Garratt Author-X-Name-First: Rodney Author-X-Name-Last: Garratt Author-Name: Cyril Monnet Author-X-Name-First: Cyril Author-X-Name-Last: Monnet Title: An impossibility theorem on truth-telling in fully decentralised systems Abstract: We show that truthful reporting about the realization of a publicly observed event cannot be implemented as a unique equilibrium in a completely decentralized environment. Our work provides a theoretical underpinning of the need for oracles and the related "oracle problem". Creation-Date: 2023-08 File-URL: https://www.bis.org/publ/work1117.pdf File-Format: Application/pdf File-Function: Full PDF document File-URL: https://www.bis.org/publ/work1117.htm File-Format: text/html Number: 1117 Keywords: decentralized systems, smart contracts, truth-telling, oracle problem Classification-JEL: C72, D72, D86, O33 Handle: RePEc:bis:biswps:1117