Zcash developers have set a January target to integrate quantum-resistant signature support into the privacy coin’s protocol, though no network activation date has been confirmed. The planned upgrade would initially shield transparent transactions, which represent roughly 70% of all issued ZEC, while shielded payments would require additional safeguards.

The effort, led by the Zakura program that operates the Zcash network, includes a private lookup tool that enables wallets to verify balances without exposing linked addresses to servers. An experimental version of this tool is already accessible through the "Private queries" feature in the Vizor wallet.

Roman Akhtariev, a developer working on the project, outlined the timeline in an engineering post, stating that post-quantum signature opcodes are expected to be merged in January. These opcodes would allow the network to validate hash-based signatures, a cryptographic method designed to resist quantum computing attacks. The change aims to prevent adversaries from reversing public keys to forge transaction approvals.

Quantum-resistant signatures rely on hash functions that are computationally infeasible to invert, meaning that even if quantum computers break current cryptographic assumptions, they would not automatically compromise the new system. Fresh addresses are used to keep spending keys hidden until transactions occur, and the proposed signatures would protect payments once approval becomes public.

The announcement follows warnings from Ethereum researcher Justin Drake, who recently urged cryptocurrency holders to prepare for a potential "bunker mode" scenario in which artificial intelligence could accelerate attacks on wallet security. Drake suggested that AI might uncover vulnerabilities in Bitcoin and Ethereum wallet protections within months under worst-case conditions. Ethereum’s broader migration to quantum-resistant cryptography is targeted for completion by December 2029, though no practical attacks on wallet keys have been observed to date.

ZEC traded near $1,185 on Thursday, down approximately 11% over the prior week, reflecting broader market declines triggered by heightened scrutiny of AI-driven cryptographic threats. The price movement coincided with increased visibility of Drake’s warning across social platforms.

Zcash distinguishes between two transaction types: transparent payments, which function similarly to Bitcoin and expose addresses and amounts on the blockchain, and shielded payments, which conceal sender, recipient, and amount. As of the latest data, about 11.96 million of the 16.98 million ZEC in circulation were held in transparent addresses, according to CoinDesk’s analysis of ZecStats.

In transparent transactions, a secret key authorizes spending, while a public key allows network verification. Current security models assume reversing the public key to derive the secret is computationally impractical. The new hash-based signatures would shift to a different verification mechanism that does not rely on the same mathematical assumptions, potentially offering greater resilience.

However, shielded transactions introduce new considerations. Zcash’s design warns that if a recipient’s address is exposed, encrypted payment records could be harvested now and decrypted later if quantum capabilities advance. This forward-looking risk necessitates separate protections for shielded payment streams.

Zakura’s private lookup tool employs private information retrieval, a technique that allows databases to return specific records without revealing which record was requested. This enables wallets to check balances without disclosing address lists to servers, preserving anonymity while maintaining public transaction visibility.

An experimental implementation of this functionality is already available in Vizor, allowing users to test private balance queries. The development marks a step toward mitigating metadata leakage in wallet operations, though broader deployment will depend on further testing and community review.

The timeline and technical approach reflect ongoing efforts across the cryptocurrency industry to future-proof digital asset security against emerging computational threats. While quantum computing capabilities remain constrained, the proactive planning underscores growing awareness of long-term cryptographic risks.