From Zerocoin To Zcash at Zcon0 (2018) by Matthew Green

Introduction to Zcash and Its Origins

Background of the Speaker

• The speaker is a professor of cryptography at Johns Hopkins University, specializing in applied cryptography and privacy.

• He is one of the seven scientists who invented the zero cash protocol that Zcash is based on.

Personal Inspirations

• The speaker's interest in crypto was sparked by reading Bruce Schneier's "Applied Cryptography" and the fiction book "Cryptonomicon."

• He humorously notes that his experience with Zcash lacks the excitement depicted in fiction, focusing instead on coding and algorithms.

Historical Context of Electronic Payments

Pre-Bitcoin Developments

• In the 1980s, cryptographers recognized potential privacy issues with electronic payments and sought solutions.

• David Chaum invented eCash, allowing anonymous transactions without revealing user identities or transaction details.

Limitations of Early Systems

• Early systems relied on trusted parties (like banks), which hindered their success due to regulatory challenges.

• Events like 9/11 made it increasingly difficult for privacy-preserving currencies to exist as authorities cracked down on non-anonymous systems.

Transition to Bitcoin

Emergence of Bitcoin

• Bitcoin introduced a decentralized currency model using a consensus algorithm that allowed everyone to participate in maintaining the ledger.

Privacy Concerns with Bitcoin

• Despite its innovations, Bitcoin lacked privacy; all transactions were publicly visible, raising concerns about user safety.

• The speaker highlights real-world implications where public transaction data led to extortion cases within cryptocurrency communities.

Development of Zerocoin

Conceptualization of Zerocoin

• The idea behind Zerocoin was to use zero-knowledge proofs for anonymous transactions while mixing coins from different users.

Challenges Faced

• Initial implementations faced efficiency issues; verification times were too long, making it impractical for widespread use.

Advancements Leading to Zcash

Collaboration and Innovations

• A team developing efficient zero knowledge proving technology called ZK-Snarks collaborated with the original creators to enhance Zerocoin’s functionality.

Features of Zcash

• Zcash allows variable values for coins and supports splitting and merging coins without needing a base currency.

Future Directions for Privacy Technology

Ongoing Improvements

• The speaker emphasizes the need for continued development in privacy technologies beyond just currency applications.

Community Engagement

• As a board member, he expresses optimism about community-driven advancements in privacy tech while acknowledging existing challenges like usability.

Conclusion: Vision for Future Developments

Expanding Use Cases

• There are opportunities beyond cash transactions; potential exists for smart contracts and user-defined assets using zero knowledge proofs.

Governance Considerations

• Upcoming governance decisions will shape future directions for both Zcash and broader research initiatives within the community.