How Zcash Just Rebuilt Itself to Challenge Visa at 50,000 Transactions Per Second

A privacy coin that most investors have forgotten just quietly launched a complete rebuild of its core software — and the team behind it says they are aiming for Visa-level transaction speeds with full privacy intact. The new node software, called Zakura, went live this week as part of a broader plan that could reshape how zero-knowledge proofs work at scale.

By Amir Hassan | July 20, 2026

The Hook: A Privacy Network Aims for the Big Leagues

Zcash, the privacy-focused cryptocurrency that lets users shield transaction amounts and participants from public view, has spent years fighting a reputation as a niche project. Critics argued its technology was too slow, its wallet experience was clunky, and its network could never handle real-world payment volume. This week, a team of independent developers released Zakura, a brand-new full node that represents the first piece of an ambitious plan to prove those critics wrong.

A full node is the software that keeps a complete copy of a blockchain and checks every transaction against the network rules. Think of it as the referee of the network — without nodes, there is no game. Zakura is maintained by Sean Bowe, one of the founding members of Zcash zero-knowledge cryptography, and Dev Ojha, the cofounder of the Osmosis decentralized exchange who now leads Valar Group. Their teams are funded by private ZEC donations rather than by any company or foundation.

The goal? According to the team, payments giants like Visa and Mastercard process more than 50,000 transactions per second — and the developers call that figure their floor, not their ceiling. That is a staggering ambition for a network whose wallet software currently tops out at roughly one transaction per second.

On-Chain Evidence: What Zakura Actually Does

The new node software, which launched at version 1.0.0, is a fork of Zebra, the Zcash Foundation official node software. That means the developers started from the existing codebase and rebuilt key parts from scratch. Three features stand out for anyone trying to understand why this matters:

• Massive disk savings through pruning — Zakura can delete old blockchain data that a node no longer needs, shrinking the chain to roughly 11 gigabytes with the old data stripped out. For comparison, running a full node on many blockchains requires hundreds of gigabytes of storage.
• Fast sync in under two minutes — The team publishes ready-made copies of the pruned chain, so a new node can download a snapshot instead of pulling every block one at a time. The developers claim this is 680 times faster than the traditional approach.
• Backward compatibility — Zakura includes a mode that mimics the interface of zcashd, the original Zcash client that reached end of life on July 18. That means wallets and exchanges built for the old software keep working without any changes.

For regular investors, the practical takeaway is simpler: running a Zcash node just got dramatically cheaper and faster. Lower barriers to running nodes means more node operators, which means a more decentralized and resilient network. That is the kind of infrastructure improvement that strengthen the long-term case for a cryptocurrency, even if it does not move the price tomorrow.

The Core Conflict: Can Zero-Knowledge Proofs Scale to Visa Levels?

The hardest part of the Zcash scaling vision is not the node software — it is the math. Every private Zcash transaction carries a cryptographic proof that verifies the transaction is valid without revealing who sent it, how much was sent, or to whom. These proofs are large. According to the development team, handling 50,000 private transactions per second with Zcash current cryptography would demand over 500 megabytes of data per second flowing through every node. That is roughly a full DVD of data arriving every ten seconds, nonstop.

No current Zcash software can handle anything close to that load. This is where two research efforts come in:

• Project Tachyon — Led by Sean Bowe, this effort focuses on recursive proofs, a technique where a single proof can verify the validity of thousands of other proofs at once. Instead of a node checking every individual transaction proof, it checks one bundled proof. The team claims this could reduce the data requirement for consensus from roughly 100 megabytes per second down to 500 megabytes total — a level they describe as technically achievable with careful engineering.
• Private Information Retrieval (PIR) — Valar Group is working on a solution for wallets. Because Zcash hides transaction recipients, a wallet currently has to download every transaction and test each one to see if it belongs to the user. That is why wallet performance maxes out at about one transaction per second. PIR would let a wallet fetch its own data from a server without the server learning which entries were requested — think of it like asking a librarian for a specific book without telling them which book you want.

Both projects are still in development. The team has not published a timeline for when Tachyon or PIR will be production-ready, and the claims about achievable throughput have not been independently verified at scale. But the architectural direction — compressing verification through recursive proofs and solving the wallet bottleneck through private data retrieval — represents some of the most ambitious zero-knowledge research in the industry.

Market Implications: Why Ironwood Matters Now

While the scaling vision is the headline, there is an immediate reason Zcash investors should pay attention. On July 28, the network will activate a critical upgrade called Ironwood, formally known as NU6.3, at block 3,428,143. Zakura supports this upgrade from launch, and every major Zcash organization has committed to the activation height.

Ironwood exists because of a security scare that nearly broke Zcash in June. On May 29, a researcher from Shielded Labs named Taylor Hornby discovered that the proof circuit for Orchard — the newest shielded pool, where transaction amounts and participants are hidden — contained a soundness bug. In plain English, the flaw could have allowed someone to create counterfeit ZEC tokens with no trace on the blockchain. The bug had been live since Orchard launched in May 2022, meaning the vulnerability sat undetected for roughly four years.

Developers disabled Orchard through an emergency response completed June 2, then restored it with a corrected circuit via a hard fork on June 3. But the patch could not account for the four years the hole was open. Because zero-knowledge proofs reveal nothing beyond their validity, nobody can prove that counterfeit ZEC was never created during that window.

Ironwood settles the question with a mechanism called a turnstile. It caps what can exit and enter the Orchard shielded pool. Honest balances can migrate out over time, but any counterfeit coins that may exist inside are effectively trapped. It is a creative solution to a problem that is unique to privacy coins — you cannot audit what you cannot see, so you build a gate at the boundary instead.

For the broader market, the Zcash story is a reminder that blockchain infrastructure is still evolving rapidly. While Bitcoin trades at 65,065, Ethereum at 1,896, and Solana at 77.44, the real building is happening in the trenches of zero-knowledge cryptography — the technology that could eventually let blockchains match the speed of traditional payment networks without sacrificing privacy.

The Verdict: Ambitious Tech, Uncertain Timeline

The Zakura launch is a concrete deliverable — new node software that exists today, runs faster, and uses less storage. That is real and verifiable. The scaling vision behind it, however, depends on research that is still in progress. Project Tachyon recursive proofs and Valar private information retrieval are the kinds of breakthroughs that could be transformative if they work as described, but the team has not yet demonstrated them at Visa-scale volume.

For investors, the calculus is straightforward. Zcash is betting its future on the idea that privacy and scale can coexist — that you can have a blockchain that processes tens of thousands of transactions per second while hiding every detail of every payment. If the technology arrives, Zcash becomes a credible competitor in global payments. If it does not, the project risks remaining a respected but niche privacy tool. Either way, the Ironwood upgrade on July 28 is the next concrete milestone to watch, because it will determine whether the network can put its recent security scare fully behind it.

The broader lesson for cryptocurrency investors is that infrastructure matters. Price action grabs attention, but the teams rebuilding core software — faster nodes, better proofs, smarter wallets — are the ones writing the next chapter of the industry. Zcash may have been forgotten by the market, but the technology being built right now is anything but quiet.

The cryptocurrency market remains highly volatile. This article is for informational purposes only and does not constitute financial advice.