Zcash developers are aiming for January 2027 to introduce post-quantum payment support for the network’s transparent transactions, a step intended to reduce the long-term risk that future quantum computers could break today’s wallet cryptography.

The proposal is still a development target rather than a confirmed mainnet activation date. No final network upgrade specification or mandatory migration schedule has been announced, and the change would address only part of Zcash’s broader quantum-resistance challenge.

Planned opcode changes focus on transparent addresses

The work centers on new signature-verification instructions that would let transparent Zcash payments use post-quantum methods instead of relying only on elliptic-curve cryptography. At present, transparent transactions use conventional public-key systems whose security depends on mathematical problems considered impractical for classical computers to solve with known techniques.

Developers say sufficiently advanced quantum computers could eventually weaken that protection by recovering private keys from exposed public keys. Under the proposal from Zakura, transparent payments could use hash-based signatures built on different assumptions, with constructions under consideration including Winternitz One-Time Signatures, or WOTS.

In an engineering update, Akhtariev said the team plans for post-quantum signature opcodes to land in Zcash in January. That statement does not amount to a final launch timetable for the network as a whole.

Why the change matters now

The emphasis on transparent payments reflects where much of the supply still sits. Data from ZecStats showed that about 11.96 million ZEC were held in the transparent pool on Oct. 9, equal to 70.4% of the roughly 16.98 million coins issued. Another 4.95 million ZEC was spread across Zcash’s shielded pools.

Transparent addresses, like Bitcoin-style addresses, reveal addresses and transferred amounts on-chain. They generally store a hash of the owner’s public key, while the public key itself is usually exposed when funds are spent. That creates a future risk if quantum attacks ever become practical against revealed keys.

Zakura’s engineers said one mitigation is to use a fresh address after spending, because coins moved to a new address remain behind a different public-key hash until that key is revealed. Even so, they cautioned that exposure of an account’s extended public key or related viewing data can put more of the same wallet’s keys at risk.

Not a complete quantum-resistance solution

The proposed upgrade would improve protection for transparent transactions, but it would not make Zcash fully safe from quantum attacks on its own. The network’s existing shielded systems still depend on cryptographic components that would need additional changes.

Zcash previously added other protections through the Ironwood upgrade on July 28. That release introduced a new shielded pool with extra supply protections and mechanisms intended to support future recovery under certain quantum-attack scenarios.

Those Ironwood recovery features, however, do not by themselves make the current shielded transaction cryptography quantum-resistant. The January 2027 target therefore represents one piece of a longer technical roadmap rather than a complete fix.

Private wallet queries and current market backdrop

Alongside the signature work, Zakura has also built a private information retrieval system meant to help wallets check transparent balances without disclosing their full address history to a server. Instead of openly asking for records tied to each address, the wallet can retrieve needed data while concealing which database entries it selected.

According to the engineering explanation, the method groups confirmed transaction data into smaller database segments and lets wallets inspect compact activity filters locally before sending private requests for matching records. The feature is intended to support balance checks, transaction-history recovery and wallet restoration, and an experimental version is available in the Vizor wallet under the Private queries setting.

As development continues, ZEC was trading near $1,240 on Oct. 9, according to CoinGecko, up about 2.5% over 24 hours but still almost 12% lower over the previous seven days. Daily trading volume was around $1.57 billion and market capitalization was about $21 billion. The next confirmed step for the network remains the ongoing engineering process, as developers have not yet announced a final mainnet activation plan for the post-quantum changes.

Source: crypto.news