Paper 2020/560
Zerojoin: Combining Zerocoin and CoinJoin
Alexander Chepurnoy and Amitabh Saxena
Abstract
We present Zerojoin, a privacy-enhancing protocol for UTXO blockchains. Like Zerocoin, our protocol uses zero-knowledge proofs and a pool of participants. However, unlike Zerocoin, our pool size is not monotonically increasing. Thus, our protocol overcomes the major drawback of Zerocoin. Our approach can also be considered a non-interactive variant of CoinJoin, where the interaction is replaced by a public transaction on the blockchain. The security of Zerojoin relies on the Decisional-Diffie-Hellman (DDH) assumption. We also present ErgoMix, a practical implementation of Zerojoin on top of Ergo, a smart contract platform based on Sigma protocols. While Zerojoin contains the key ideas, it leaves open the practical issue of handling fees. The key contribution of ErgoMix is a novel approach to handle fees in Zerojoin.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Published elsewhere. Minor revision. Data Privacy Management, Cryptocurrencies and Blockchain Technology. DPM 2020, CBT 2020.
- Keywords
- cryptocurrencyprivacyDDHzero knowledge
- Contact author(s)
- kushti @ protonmail ch
- History
- 2021-08-29: last of 4 revisions
- 2020-05-15: received
- See all versions
- Short URL
- https://ia.cr/2020/560
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2020/560,
author = {Alexander Chepurnoy and Amitabh Saxena},
title = {Zerojoin: Combining Zerocoin and {CoinJoin}},
howpublished = {Cryptology {ePrint} Archive, Paper 2020/560},
year = {2020},
url = {https://eprint.iacr.org/2020/560}
}
