The Evolution of Privacy

Zcash launched as the first cryptocurrency with zk-SNARK based shielded transactions. The Sprout circuit introduced private transfers using JoinSplit proofs, establishing the foundation for financial privacy on a public blockchain.

The first network upgrade established the framework for future upgrades. It introduced transaction expiry and replay protection, proving Zcash could evolve safely.

A monumental upgrade that replaced Sprout's slow proving with Groth16 proofs, making shielded transactions 100x faster and enabling mobile wallet support for the first time.

Blossom doubled block production frequency from 150 seconds to 75 seconds, increasing throughput and reducing confirmation latency while maintaining the same issuance schedule.

Heartwood enabled shielded coinbase outputs, allowing miners to receive block rewards directly into shielded addresses. It also introduced FlyClient commitments to improve light client verification.

Canopy replaced the orignal Founders' Reward with a new Dev Fund, allocating 20% of block rewards to ECC, Zcash Foundation, and community grants. Deprecated Sprout shielding to encourage migration.

NU5 introduced the Orchard shielded pool and the Halo 2 proving system, eliminating trusted setup ceremonies. It also introduced Unified Addresses to simplify user interactions across transparent and shielded pools.

NU6 introduced the lockbox treasury system to manage post-Dev-Fund funding and aligned Zcash governance for long-term sustainability following the second halving.