We study decentralized cryptocurrency protocols in which the participants donot deplete physical scarce resources. Such protocols commonly rely on Proof ofStake, i.e., on mechanisms that extend voting power to the stakeholders of thesystem. We offer analysis of existing protocols that have a substantial amountof popularity. We then present our novel pure Proof of Stake protocols, andargue that they help in mitigating problems that the existing protocolsexhibit.
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