Kleros is a decentralized dispute resolution protocol for use on smart contract platforms, which has been implemented on Ethereum. It acts as a decentralized third party capable of providing decisions on the correct result when applying a set of rules to questions ranging from simple to highly complex. This is achieved by using game-theoretic incentives to have crowdsourced jurors analyze and rule on cases correctly. Hence, Kleros provides judgments in an inexpensive, reliable, typically fast, and decentralized way. Of particular relevance is the use of this protocol to dispute resolution, creating a form of decentralized justice.

The rise of the digital economy created labor, capital and product markets that operate in real time across national boundaries. The P2P economy requires a fast, inexpensive, decentralized and reliable dispute resolution mechanism. Kleros uses game theory and blockchain in a multipurpose arbitration protocol capable of supporting a large number of applications in ecommerce, finance, insurance, travel, international trade, consumer protection, intellectual property and academia among many others. Cryptocurrencies are giving many the possibility of having their first bank account to send and receive money in a secure way. Cryptocurrencies are helping millions achieve financial inclusion. Kleros will do the same in access to justice by enabling arbitration in a large number of contracts that are too costly to pursue in court. Just as Bitcoin brought “banking for the unbanked”, Kleros has the potential to bring “justice for the unjusticed”.