S16 E32: Bitcoin vs Monero vs Zcash Privacy with Diego Salazar & Luke Szramowski of Cypher Stack

Diego Salazar & Luke Szramowski are working to build Cypher Space: a privacy & sovereignty company. In this episode, they compare + rate the privacy of Bitcoin, Monero, Zcash, Firo, Mimble Wimble (Litecoin, Grin), Zano & Beam. Time stamps: (00:00:59) Introducing Diego Salazar & Luke Szramowski (00:02:04) Tribalism and Privacy Protocols in Crypto (00:03:55) Why Privacy Matters & Personal Motivations (00:04:58) Diego’s Background and Cypher Stack (00:06:58) Luke’s Background and Mathematical Perspective (00:08:40) CoinJoin and the Limits of Bitcoin Privacy (00:09:10) Threat Models and Privacy Tool Selection (00:12:22) CoinJoin’s Effectiveness and Metadata Attacks (00:14:18) Comparing CoinJoin to Tor/VPN Usage (00:17:26) Overconfidence and Under-Researched Privacy Claims (00:19:52) Levels of Privacy and User Education (00:24:31) Defining Adversaries in Privacy Research (00:26:10) CoinJoin’s Real-World Threats and Research Gaps (00:27:17) Social Media, Nuance, and Privacy Debates (00:29:11) CoinJoin as “Add-On” Privacy and Side-Channel Attacks (00:31:46) Underestimating Adversaries and Attack Tools (00:38:37) Sponsor Plugs and Criteria for Privacy Evaluation (00:42:47) Scoring CoinJoin on Privacy Criteria (00:51:09) WabiSabi and Wasabi Wallet Improvements (00:59:29) Other Bitcoin Privacy Tools: BIP47 & Silent Payments (01:06:19) Human Error and Privacy Tool Usability (01:08:51) The Limits of Privacy Ratings and the Need for Nuance (01:12:19) Tribalism, Community Research, and Productive Debate (01:15:33) Non-Interactive Proofs and Security Assumptions (01:16:27) Bitcoin Maximalism and the Limits of Debate (01:17:34) Academic Rigor and the Need for More Research (01:20:01) Bitcoin’s Privacy Risks if Mainstream Adoption Happens (01:21:44) The State of Bitcoin Privacy Research and Funding (01:34:03) Bitcoin’s Missed Privacy Opportunities (01:37:14) Monero’s History and Privacy Technologies (01:41:03) Monero’s Anonymity Set and Privacy Trade-Offs (01:46:52) Monero’s Current Weaknesses and Upcoming FCMP (01:55:24) Monero’s Privacy Scores and Scalability (02:27:50) Zcash: History, Community, and Technology (03:00:29) Zcash’s Privacy Model and Accumulator Approach (03:05:56) Zero-Knowledge Proofs Explained (03:20:08) Zcash’s Privacy Scores and Tachyon Scalability (03:35:12) Firo (formerly Zcoin) and Spark Protocol (03:44:45) Firo’s Privacy Scores and Future Upgrades (03:52:06) Litecoin MWEB and Mimblewimble (04:01:32) MWEB Privacy Scores and Limitations (04:07:03) Other Privacy Projects: Zano, Beam, Salvium (04:10:02) Toxicity, Community, and the Human Element (04:17:00) Philosophy of Privacy and Human Nature (04:24:28) Fungibility, Bitcoin, and Social Realities (04:44:15) Summary and Chart of Privacy Scores (04:57:52) Resources for Privacy Research and Final Thoughts