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Blockchains, a decentralized peer-to-peer (P2P) ledger system, can provide trusted consen- sus, computation, and immutable data between untrusted entities. The goal of blockchain privacy is to protect sender privacy, receiver privacy, and/or provide confidential transac- tions. Since Bitcoin, there are a number of research articles for blockchain privacy. Notable approaches are to use ring signatures [RST01] to achieve sender privacy and stealth addresses for receiver privacy (e.g., the Monero cryptocurrency).