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Zerocash Decentralized Anonymous Payments from Bitcoin


Permacoin Repurposing Bitcoin

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Abstract


Bitcoin is the first digital currency to see widespread adoption. While payments are conducted between pseudonyms, Bitcoin cannot offer strong privacy guarantees: payment transactions are recorded in a public decentralized ledger, from which much information can be deduced. Zerocoin (Miers et al., IEEE S&P 2013) tackles some of these privacy issues by unlinking transactions from the payment√Ę‚?¨‚?Ęs origin. Yet, it still reveals payments√Ę‚?¨‚?Ę destinations and amounts, and is limited in functionality. In this paper, we construct a full-fledged ledger-based digital currency with strong privacy guarantees. Our results leverage recent advances in zero-knowledge Succinct Non-interactive ARguments of Knowledge (zk-SNARKs). First, we formulate and construct decentralized anonymous payment schemes (DAP schemes). A DAP scheme enables users to directly pay each other privately: the corresponding transaction hides the payment√Ę‚?¨‚?Ęs origin, destination, and transferred amount. We provide formal definitions and proofs of the construction√Ę‚?¨‚?Ęs security. Second, we build Zerocash, a practical instantiation of our DAP scheme construction. In Zerocash, transactions are less than 1 kB and take under 6 ms to verify √Ę‚?¨‚?? orders of magnitude more efficient than the less-anonymous Zerocoin and competitive with plain Bitcoin.

KeyWords
Bitcoin,electronic,knowledge



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