On the linkability of Zcash transactions

Quesnelle, Jeffrey (2017) On the linkability of Zcash transactions. Computing Research Repository.

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Abstract

Zcash is a fork of Bitcoin with optional anonymity features. While transparent transactions are fully linkable, shielded transactions use zero-knowledge proofs to obscure the parties and amounts of the transactions. First, we observe various metrics regarding the usage of shielded addresses. Moreover, we show that most coins sent to shielded addresses are later sent back to transparent addresses. We then search for round-trip transactions, where the same, or nearly the same number of coins are sent from a transparent address, to a shielded address, and back again to a transparent address. We argue that such behavior exhibits high linkability, especially when they occur nearby temporally. Using this heuristic our analysis matched 31.5% of all coins sent to shielded addresses.

Item Type: Article
Divisions: Computer Science
Depositing User: Unnamed user with email richard.dabels@uni-rostock.de
Date Deposited: 03 Sep 2019 16:34
Last Modified: 03 Sep 2019 16:34
URI: http://blossom.informatik.uni-rostock.de/id/eprint/23

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