💸 Cashu & Ecash

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This folder contains the Deep Dive Summary and Atomic Notes related to the Cashu protocol and the history of Chaumian eCash, detailing how best-in-class privacy can be achieved by combining historical cryptographic primitives with modern Bitcoin infrastructure.

Deep Dive Summary

• 📖 04. Ecash & Cashu - Deep Dive Summary - The overarching summary of the lecture presented by Calle.

Atomic Notes

Fundamentals

• 📜 Ecash Properties & History: The history of David Chaum, DigiCash, and the shift from ledger-based to bearer-asset topology.
• 🧮 Blind Signatures Cryptography: Understanding the math behind the mint’s “carbon paper” signing mechanism.

Architecture & Network Integration

• 🏛️ Cashu Mint Architecture: Custodial double-spend protection with perfect privacy and deep irreversibility.
• ⚡ Cashu Lightning Integration: Seamless bridging of independent mints utilizing the Lightning Network as connective tissue (Minting & Melting).

Advanced Capabilities

• 🤖 Cashu Programmability (P2PK & HTLC): Enforcing spending conditions to enable offline receiving, high-frequency micropayments, and trustless atomic swaps through third-party Lightning Gateways.