What is Zcash and how does it protect transaction privacy?

Zcash is a privacy-focused cryptocurrency that lets users hide key details of their transactions using zk-SNARKs technology. It was created to offer a different solution to this problem: a cryptocurrency based on blockchain that enables private transactions using Zero-Knowledge Proofs, specifically ZK-SNARK protocols. 

In Zcash's shielded transactions, information such as the sender, the recipient and the amount transferred can stay hidden from public view, while the network can still verify the transaction's validity without revealing this information. That said, Zcash is not fully anonymous, and transparent transactions are also possible alongside shielded ones. This feature, together with a limited supply of 21 million coins, a proof-of-work mining mechanism and the major changes the network has gone through in recent years, has made ZEC one of the best-known projects among privacy-focused cryptocurrencies.

In this article, we look at what Zcash is, how it protects transaction privacy, how it differs from Bitcoin, how ZEC mining works, and what the network's most important technical developments and road ahead are. 

 

What is Zcash? Key points about the ZEC cryptocurrency

Zcash was created in response to Bitcoin's limitations and uses zk-SNAR technology to keep transactions private. Like Bitcoin, Zcash uses the proof-of-work consensus algorithm, but users can make transactions either transparently or shielded. After a vulnerability was disclosed in the Orchard shielded pool, the Zcash network activated the Ironwood upgrade in July 2026 to move funds to a new private pool.

For years, Bitcoin was used to buy drugs online because it was thought to be anonymous. In practice, however, Bitcoin transactions are surprisingly easy to trace. Zcash, by contrast, was the cryptocurrency that promised to deliver what Bitcoin could not: privacy. Of course, this concealment of information can bring its own problems, which we will look at below.

How does Zcash work, and how is transaction privacy preserved?

Zcash is designed to hide key transaction details, including the sender, the recipient and the amount. Using cryptographic techniques, the network enables transfers that cannot easily be traced on the public ledger, while the network can still verify their validity. Zcash lets users make transactions transparently, as with Bitcoin, or make them private using zero-knowledge proofs, known as zk-SNARKs. This technology verifies a transaction's validity without revealing its sender, recipient or amount.

Zcash achieves good fungibility when coins are fully shielded, meaning units in the private pool are not linked to a visible transaction history. However, most Zcash coins sit in the transparent pool, which, like Bitcoin, keeps a visible transaction history.

The Zcash network has two types of addresses: transparent addresses (t-addrs) and shielded addresses (z-addrs). Wallets such as Electric Coin Company's Zashi now also shield funds by default to increase use of the privacy features.

Who created Zcash, and how did ZEC come about?

 Zcash was launched in October 2016 as a privacy-focused cryptocurrency by Electric Coin Company (ECC), led by Zooko Wilcox-O’Hearn. The project also drew on research from Johns Hopkins University, the Massachusetts Institute of Technology (MIT), Tel Aviv University and other institutions. Like Bitcoin, Zcash (ZEC) has a maximum supply of 21 million coins, and its mining reward is halved every four years.

Although ECC started Zcash, it does not own or control its blockchain. Network upgrades require community approval, which gives Zcash's development an open, decentralized structure rather than being driven solely by a single entity.

Zcash's initial setup ceremony and Edward Snowden

At launch, Zcash relied on a «trusted setup ceremony». In this process, six participants each generated part of a private key and then destroyed that part. The aim of the process was to prevent ZEC from being counterfeited.

In April 2022, it emerged that Edward Snowden had been one of the ceremony's participants. Josh Swihart, former CEO of Electric Coin Company, told Decrypt that Snowden did it as a service, a public good, and out of a belief in the importance of privacy.

History of Zcash (ZEC): key events and network upgrades

1. May 2013: The Zerocoin proposal at Johns Hopkins University kicked off a series of privacy-focused cryptocurrency research that eventually led to Zcash.
2. January 2016: Zooko Wilcox officially introduced the Zcash project as a privacy-focused fork of Bitcoin.
3. October 2016: Zcash launched after the trusted setup ceremony, and its network went live. At one point, Zcash's price hit an all-time high of $5,941.80.
4. October 2018: The Sapling upgrade was activated, improving the speed and efficiency of shielded transactions.
5. December 2019: The Blossom network upgrade took place, increasing block production frequency.
6. November 2020: Zcash went through its first halving.
7. April 2022: Edward Snowden was publicly revealed as «John Dobbertin», one of the participants in the initial setup ceremony; he took part in the trusted setup process but was not its architect.
8. May 2022: Network Upgrade 5, which included the Orchard upgrade, was released. This upgrade reduced new shielded pools' reliance on the earlier complex setup ceremony and enabled private digital cash payments on mobile using a new format called Unified Addresses.
9. November 2024: Zcash's second halving took place.
10. January 2026: The Zcash Foundation announced that the US Securities and Exchange Commission (SEC) had concluded its investigation into the nonprofit without recommending enforcement action.
11. January 2026: Electric Coin Company's CEO announced that, following a dispute with the nonprofit's board members, his entire team had been «constructively discharged» from their positions.
12. May 2026: Security researcher Taylor Hornby discovered a «critical counterfeiting vulnerability» in Zcash's Orchard privacy pool with the help of Anthropic's Claude Opus 4.8.
13. June 2026: After confidential coordination with various parts of the ecosystem, Zcash developers released an emergency fix. Public disclosure of the four-year-old flaw led to a sharp drop in ZEC's price and intensified debate over the balance between privacy and auditability.
14. June 2026: Zcash founder Zooko Wilcox proposed the Ironwood upgrade so users could independently verify ZEC's circulating supply.
15. July 2026: The Ironwood upgrade was activated, replacing the Orchard shielded pool with a new private pool and introducing quantum-resistant transaction records.
16. November 2028: Zcash's third halving is scheduled for this date.

How does Zcash mining work? 

Like Bitcoin, Zcash uses proof of work (PoW) to confirm transactions, but it uses the Equihash algorithm, an algorithm based on a memory-hard hash function designed to make mining fairer and more resistant to ASIC hardware. Equihash is the consensus mechanism Zcash originally chose to secure its network.

Currently, Zcash miners receive 80% of each block reward, and the remaining 20% goes to development funds that support the Electric Coin Company (ECC), the Zcash Foundation and community grants. This development funding structure is governed by community decision and is set to be extended or revised after the next halving.

Zcash is a peer-to-peer cryptocurrency designed for everyday payments. Users can choose between transparent transactions, which are more suitable for regulators, and shielded transactions, which provide a higher level of privacy. This choice has helped Zcash get listed on more major exchanges than some other privacy coins such as Monero, coins that some platforms avoid due to regulatory restrictions. Bitcoin has had a major influence on Zcash's design. Like the largest cryptocurrency on the market, Zcash is designed for use in everyday purchases. At the same time, its various privacy features allow users to send or receive transactions that are not visible to curious parties outside the network.

Zcash and regulatory challenges: the stance of regulators and law enforcement

Around the world, regulators and law enforcement agencies have stepped up scrutiny of privacy coins, arguing that the anonymizing features of these assets could be abused for money laundering or sanctions evasion. In the United States, the Treasury Department's Financial Crimes Enforcement Network (FinCEN) has also proposed stricter rules for «anonymity-enhanced cryptocurrencies».

Regulators wrote in 2020 that several types of these cryptocurrencies, including Monero, Zcash, Dash, Komodo and Beam, were growing in popularity and use technologies that make it difficult for investigators to trace blockchain transactions or link them to individuals involved in illegal activity.

As regulatory enforcement in the crypto market intensified, some exchanges began delisting privacy coins. In November 2020, the ShapeShift exchange delisted Monero, Dash and Zcash to reduce its regulatory risk, then relisted Zcash in December 2025 and, in February 2026, officially integrated Zcash shielded transactions. OKX also delisted Zcash, Monero and Dash in 2023, but relisted Zcash in November 2025, during a surge in the coin's price. In 2026, Zcash was still listed on Binance, although in April 2025 it had been added to a list of cryptocurrencies the Binance community could vote to delist.

What was the Zcash Orchard vulnerability and why did it matter?

In May 2026, the disclosure of a «critical counterfeiting vulnerability» in Zcash's Orchard shielded pool raised questions about supply integrity, the trade-offs between privacy and auditability, and the growing role of artificial intelligence in the blockchain industry.

On 29 May 2026, independent security researcher Taylor Hornby, with the help of Anthropic's Claude Opus 4.8, discovered a critical vulnerability in Zcash's Orchard privacy pool. The flaw could have allowed an attacker to create an unlimited amount of counterfeit ZEC within the network's shielded transaction system. After the issue was identified, Zcash developers deployed an emergency fix following confidential coordination with protocol developers, miners, exchanges and other ecosystem stakeholders.

On 3 June 2026, the Zcash Foundation publicly disclosed the vulnerability and completed a network upgrade that restored Orchard functionality using corrected cryptographic circuits. Developers said there was no evidence the flaw had been exploited and that the total ZEC supply remained intact.

Despite the announced fix and the lack of evidence that an attacker had used it, the public disclosure of a vulnerability that had existed in the protocol for four years wiped billions of dollars off the privacy coin's market value. Because Orchard transactions are shielded, developers acknowledged that there is no definitive cryptographic way to determine whether counterfeit coins were created before the bug was fixed. To address this concern, a week after the issue came to light, Zcash founder Zooko Wilcox proposed the Ironwood upgrade so that users could independently verify the coin's circulating supply.

The vulnerability disclosure also became part of a broader debate about using advanced AI models to discover vulnerabilities. Security researchers have warned that increasingly capable AI systems can both speed up defensive security research and help uncover exploitable software flaws.

The Zcash Ironwood upgrade: replacing Orchard and improving auditability

In July 2026, Zcash activated the Ironwood upgrade and retired the Orchard pool. When the upgrade went live, about 3.7 million ZEC, worth roughly $1.7 billion, was held in Orchard, and holders of these funds had to move them to the new shielded pool.

At the heart of this upgrade is a mechanism called a «turnstile» or «gate», an accounting rule that limits withdrawals from the retired pool to the verifiable amount previously deposited into it. As a result, any counterfeit ZEC that might have been created if the Orchard flaw had been exploited, whether it actually exists or not, will not be able to leave the pool. This mechanism lets the network preserve supply integrity without compromising the privacy of individual transactions, and it addresses a problem developers had acknowledged in June: the lack of a cryptographic way to prove the vulnerability had not been exploited.

Ironwood also adds quantum-resistant transaction records and a formally verified proof circuit, features designed to reduce the chance of similar flaws going undetected.

After the plan was announced in early June, developers tested it over the following weeks, and exchanges, wallets and mining pools prepared to carry out the migration. The migration also carries risks for privacy-focused users. Decentralized VPN provider Nym warned that because every holder must move their funds to the new pool, a user who goes through the process without extra protection may reveal information linking their IP address to their wallet balance. Wilcox also advised users not to rush the migration and to use tools such as Tor or a VPN when moving funds.

Does Zcash (ZEC) have a good future?

With regulators increasing oversight of digital assets and stepping up scrutiny of privacy-focused cryptocurrencies, Zcash has entered a sensitive period. A halving, a major overhaul of the funding model and a migration to new software are all happening at the same time, and these developments are a test of a privacy-focused cryptocurrency's ability to keep operating under pressure.

Nearly a decade after its launch, Zcash was once again in the spotlight for market reasons. In November 2025, according to CoinGecko data, the token's price reached $698.87. Part of this rally was driven by well-known social media figures who highlighted Zcash's community, privacy design and technical improvements.

By December 2025, Zcash was drawing attention again, with signs of growing institutional interest, including Zcash founder Zooko Wilcox serving as an adviser to a company that was building a large ZEC treasury.

In January 2026, Zcash entered a turbulent period marked by sharp price swings, internal disputes and regulatory developments. During this period, the Zcash Foundation announced that the U.S. Securities and Exchange Commission (SEC) had concluded its long-running investigation without recommending enforcement action.

The SEC decision was quickly overshadowed, whatever attention it might have drawn in the short term. In early January, the entire Electric Coin Company team announced that, following a dispute with a majority of the board of Bootstrap, a 501(c)(3) nonprofit set up to support Zcash, they had been «constructively discharged» from their positions.

After their departure, Josh Swihart, the former CEO of ECC, announced that he and his former colleagues would launch a new project called cashZ, which is set to focus on full-stack Zcash development, including a new Zcash-focused wallet.

On the other side, Shielded Labs, an independent Zcash development group whose contributors include Zooko Wilcox, received about $1.16 million in funding from Gemini and its founders, Tyler and Cameron Winklevoss. The stated goal was to strengthen «the long-term security, sustainability and scalability of the Zcash network».

Zcash's next halving is scheduled for November 2028. The current development fund also ends at the same time, and the community is discussing new funding mechanisms. ECC is also phasing out the C++ full node «zcashd» and moving to the Rust-based «zebrad», while a new wallet called Zallet is in development.

These changes in cryptography, the funding model and user experience will shape Zcash's development path in the coming years.

 

Article source: decrypt: What is Zcash (ZEC)? The Privacy Coin Using Zero-Knowledge Proofs