Zcash is the original zero-knowledge proof cryptocurrency, launched in October 2016 by a team led by cryptographer Zooko Wilcox and including academic co-inventors of several foundational ZK constructions (including Eli Ben-Sasson, Alessandro Chiesa, and others). Unlike Bitcoin — where all transactions and balances are fully transparent on a public ledger — Zcash enables shielded transactions where the sender, recipient, and amount are encrypted and verified via zkSNARKs. The blockchain records only that a valid transaction occurred, not its contents. This provides financial privacy equivalent to cash while maintaining the cryptographic guarantees of a decentralized currency. Zcash has undergone three major protocol upgrades — Sprout (2016, original zkSNARK), Sapling (2018, Groth16 — reduced proving time from 40 seconds to 2 seconds), and Orchard (2021, Halo2 — eliminated trusted setup) — each dramatically improving privacy technology. ZEC is mined via Equihash (GPU-friendly proof of work) with the same 21 million coin cap and halving schedule as Bitcoin.
| Stat | Value |
|---|---|
| Ticker | ZEC |
| Price | $351.76 |
| Market Cap | $5.86B |
| 24h Change | -3.0% |
| Circulating Supply | 16.66M ZEC |
| Max Supply | 21.00M ZEC |
| All-Time High | $3,191.93 |
| Contract (Near Protocol) | zec.omft.near |
Transparent vs. Shielded Addresses
Zcash has two address types:
Transparent (t-addresses):
- Identical to Bitcoin — fully public on blockchain
- Sender, receiver, and amount visible to anyone
- No trusted setup concerns
Shielded (z-addresses / sapling / unified):
- Transactions encrypted with zkSNARKs
- Sender: hidden (spent notes revealed only via nullifiers)
- Receiver: encrypted in transaction output
- Amount: encrypted (verifies ≥ 0 without revealing value)
Unified Addresses (UA): Current format that supports both transparent and shielded in one address.
Protocol Upgrade History
| Upgrade | Year | ZK System | Proving Time | Key Improvement |
|---|---|---|---|---|
| Sprout | 2016 | BCTV14 | ~40 seconds | First production ZKP |
| Sapling | 2018 | Groth16 | ~2 seconds | Mobile-feasible |
| Orchard | 2021 | Halo2 | ~2 seconds | No trusted setup |
Fee Model and Shielded Pool
The “shielded pool” — total ZEC in shielded addresses — is a critical Zcash health metric:
- Higher shielded pool = more anonymity for all shielded users
- Shielded pool peaked at ~20% of circulating supply
- Criticism: most ZEC (~80-90%) held in transparent addresses
- Most exchanges don’t support z-address deposits (regulatory concerns)
Trusted Setup History
Third-party open-source researchers repeatedly attempted to find flaws in Zcash’s ceremonies:
Sprout ceremony (2016): 6 participants; air-gapped machines; physical media destroyed
Sapling ceremony (2018): 87 participants in Phase 1; separate Phase 2 multi-party ceremony
Orchard (2021): Eliminated trusted setup via Halo2 accumulation — first major privacy coin to deploy trustless ZK proofs
Social Media Sentiment
Zcash is respected in cryptographic and academic communities as a technically rigorous project that genuinely advances zero-knowledge privacy research. It attracts consistent criticism from Bitcoin maximalists (trusted setup, company control, “founders’ reward” dev fund) and from regulators seeking transparent financial monitoring. The Electric Coin Company’s (ECC) decision to take 20% of block rewards as a “founders’ reward” for the first four years sparked significant controversy. Zcash has seen lower adoption than expected given its technical quality — attributed to UX friction of shielded transactions, exchange delistings in privacy coin crackdowns (Gemini, Kraken delisted ZEC in some jurisdictions), and competition from Monero’s default-privacy model.
Last updated: 2026-04
Related Terms
Sources
- “Zerocash: Decentralized Anonymous Payments from Bitcoin” — Sasson, Chiesa, et al. (2014). The academic paper underlying Zcash — introducing the Zerocash protocol that applies zkSNARKs to enable decentralized anonymous payments with cryptographic hiding of sender, receiver, and amount.
- “Sapling: Faster Shielded Transactions for Zcash” — Hopwood, Bowe, et al. / Electric Coin Company (2018). Technical specification of the Sapling network upgrade — introducing Groth16 proofs, BLS12-381 elliptic curve, JubJub inner curve, and homomorphic Pedersen commitments to reduce proving time and enable mobile shielded transactions.
- “Zcash: Economic Mechanisms and the Founders’ Reward Model” — Paradigm Research (2021). Analysis of Zcash’s economic design — examining the founder reward (20% of block subsidy for first 4 years), ZIP-1014 dev fund continuation, miner-focused tokenomics, and the tradeoffs of funding privacy technology via coin emission.
- “Zcash Regulatory Landscape: Privacy Coins and Financial Surveillance” — Coincenter / Zcash Foundation (2022). Analysis of regulatory pressures on Zcash from global financial regulators — covering exchange delistings, FATF Travel Rule implications, and Zcash’s approach to compliance-optional privacy.
- “Zcash’s Orchard Upgrade: Eliminating the Trusted Setup via Halo2” — Electric Coin Company (2021). Technical documentation of the Orchard shielded pool — the third Zcash shielded pool using Halo2 to eliminate the trusted setup requirement, enabling the first major privacy coin deployment without a ceremony.