Our paper „Balancing privacy and accountability in digital payment methods using zk-SNARKs” got accepted at PST 2022! In the paper, we describe an extension of the widely-known anonymous Zerocash cryptocurrency to allow for the auditability of anonymous transactions. Our approach is based in zero-knowledge proofs and enable fully anonymous transactions up until a certain amount of involved money in a certain pre-defined time period; going beyond this limit requires the inclusiong of auditable, encrypted transaction details. These details can then be decrypted by a group of „judges” (and only by those!). This allows for the prevent of certain types of money laundering.
