Zcash Zakura Node Targets 50,000 TPS for Privacy Payments

Zcash released Zakura, a new full node software at version 1.0.0 on Wednesday, marking the first operational component of an ambitious plan to scale the privacy-focused blockchain from roughly one private transaction per second to 50,000 transactions per second. The target matches throughput handled by global payment networks Visa and Mastercard, representing a potential 2,500-fold improvement over current shielded transaction capacity. Sean Bowe, a founding member of Zcash’s zero-knowledge cryptography team, and Dev Ojha, the Osmosis cofounder who now leads Valar Group, maintain the new client. Both teams operate on private ZEC donations rather than corporate or foundation funding.

“Our dream is to support the world’s payments. Mastercard and Visa handle more than 50k transactions per second; that’s our floor. With Zcash’s existing cryptography, that volume would demand over 500 MB/s of throughput from the node,” a blog post explained. “The current stack won’t get us there. The cryptography our teams are developing closes much of that gap.”

Independent Node Architecture Built on Zebra Foundation

Zakura functions as a pruned, fast-syncing fork of Zebra, the Zcash Foundation’s official node software. A full node maintains a complete copy of the blockchain ledger and independently verifies every transaction against the network’s consensus rules. The shared rulebook that every node enforces determines which blocks and transactions the entire network accepts as valid. Nodes applying different rules fork off and stop following the same chain as the rest of the network, making consensus adherence critical for blockchain integrity.

The new software maintains compatibility with the legacy zcashd client ahead of its July 18 end of life. Zakura represents one technical pillar of a broader scaling initiative. Project Tachyon forms another component, targeting thousands of transactions per second for shielded operations with estimates suggesting up to 10,000 TPS as a near-term milestone. Private information retrieval research rounds out the technical roadmap, collectively addressing verification data size and wallet performance bottlenecks throughout the transaction lifecycle.

Privacy Overhead Creates Technical Challenge

Zcash currently processes between 3 and 20 shielded transactions per second, making it roughly comparable to Bitcoin’s base layer in raw capacity. Every shielded Zcash transaction employs zk-SNARKs, a form of zero-knowledge cryptography. These proofs validate transactions without exposing sender, receiver, or amount information. The cryptographic privacy guarantee creates substantial computational overhead, which the new architecture specifically targets for reduction. Traditional payment networks achieve high throughput by processing transparent transactions without cryptographic privacy layers, while Zcash attempts to maintain both speed and anonymity simultaneously.

The improvements build on years of iterative upgrades, including the Sapling and Orchard shielded pools, which progressively reduced the cost and complexity of private transactions. The new node software provides the foundation for protocol-level scaling changes rather than relying on more powerful hardware. Developers designed the architecture to enable payment-network-scale throughput while preserving full verifiability and strong privacy guarantees across the system.

Ironwood Upgrade Addresses Security Vulnerability

Zakura supports the Ironwood (NU6.3) upgrade activating July 28, which introduces a turnstile mechanism to cap withdrawals from the Orchard shielded pool. The upgrade directly responds to a long-standing soundness bug that potentially allowed creation of counterfeit ZEC tokens. The turnstile mechanism limits the rate at which users can move funds out of the affected pool, containing any illegitimate tokens that may exist within the system. This security measure aims to prevent undetected inflation from spreading throughout the broader Zcash economy while developers continue investigating the vulnerability’s full scope and impact.

The consensus rules embedded in Ironwood ensure all nodes enforcing the upgrade accept the same transaction validation standards. Nodes failing to implement the turnstile restrictions will diverge from the main chain, creating a potential network split if significant portions of infrastructure operators delay updating their software. The July 18 zcashd deprecation deadline creates additional urgency for node operators to transition to either Zakura or Zebra before the legacy client loses support.

NU7 Testnet Shows Early Performance Gains

The NU7 network upgrade testnet launched on May 22, 2026, delivering encouraging initial results. Block times dropped from 75 seconds to just 25 seconds, achieving a threefold reduction in confirmation latency. Shielded TPS doubled on the testnet compared to previous benchmarks, contributing to what developers describe as a potential 300% increase in transaction speed once the upgrade reaches mainnet deployment. These performance improvements validate the technical approach underlying Project Tachyon’s scaling strategy.

The testnet results demonstrate that protocol-level optimizations can substantially improve throughput without compromising the zero-knowledge privacy guarantees that differentiate Zcash from transparent blockchains. However, achieving the ultimate 50,000 TPS target will require additional cryptographic innovations beyond what NU7 delivers. The development teams acknowledge that current cryptography would demand over 500 MB/s of throughput from nodes at Visa-scale volume, creating infrastructure requirements that exceed practical deployment constraints for most operators.

Pruning and Snapshots Enable Faster Synchronization

Zakura introduces pruning capabilities that allow nodes to discard older blockchain data after verification, significantly reducing storage requirements. This feature addresses one of the practical barriers preventing wider node deployment, particularly for operators with limited infrastructure budgets. Fast-syncing through snapshots enables new nodes to join the network without processing the entire transaction history from genesis, cutting initial synchronization time from days to hours or minutes depending on network conditions.

These operational improvements make running a full node more accessible, potentially increasing network decentralization by lowering the technical and financial barriers to participation. The combination of reduced storage needs and faster initial sync positions Zakura as a practical alternative for operators seeking to verify transactions independently without maintaining terabytes of historical data. The Rust-based codebase inherited from Zebra provides memory safety guarantees and performance characteristics that complement the scaling roadmap’s throughput objectives.