What are Sigma Protocols and how do they work?

Sigma Protocols are zero-knowledge proof systems that let you prove statements about data without revealing the data itself. On Ergo, they're built into ErgoScript, enabling privacy-preserving smart contracts. You can prove you own funds, meet conditions, or belong to a group - all without exposing your identity or exact values.

• Zero-knowledge: prove something is true without revealing why
• Built into ErgoScript: first-class privacy primitives
• Selective disclosure: reveal only what's needed
• Use cases: ring signatures, threshold signatures, private voting