Zcash Schedules Post-Quantum Signatures for January 2027
![black and white manga panel, dramatic speed lines, Akira aesthetic, bold ink work, A giant obsidian hourglass standing alone on a cracked salt flat, its frame carved from dense volcanic glass etched with intricate lattice-work filigree, the two chambers containing screaming ivory sand that pours in a narrow ribbon through the neck, the lower chamber slowly filling with interwoven crystal polygons, glowing gold numerals 2027 embedded in the glass near the top chamber, speed lines radiating from the neck along the sun-blasted ground, harsh overhead noon light creating a stark elongated shadow, white-hot sky fading to a black horizon, a breathless atmosphere of imminent transformation [Z-Image Turbo]](https://cdn.digitalrain.dev/theqi/viral-images/5e6e65c5-5af2-4529-8419-54c81d51dc27_viral_2_square.jpg "black and white manga panel, dramatic speed lines, Akira aesthetic, bold ink work, A giant obsidian hourglass standing alone on a cracked salt flat, its frame carved from dense volcanic glass etched with intricate lattice-work filigree, the two chambers containing screaming ivory sand that pours in a narrow ribbon through the neck, the lower chamber slowly filling with interwoven crystal polygons, glowing gold numerals 2027 embedded in the glass near the top chamber, speed lines radiating from the neck along the sun-blasted ground, harsh overhead noon light creating a stark elongated shadow, white-hot sky fading to a black horizon, a breathless atmosphere of imminent transformation [Z-Image Turbo]")
Come January 2027, Zcash will begin signing transactions with a cipher meant to outlast a machine that does not yet exist. It is a quiet amendment to the public ledger, where some seven in ten coins currently wait.
Zcash will introduce opcodes for post-quantum signatures into its protocol in January 2027, the Zakura team has said. The change is aimed at transparent addresses, which contain a hash of the public key that is revealed when funds are spent; if recovering a private key from a public key becomes possible, the vulnerability will affect addresses already exposed. The updated software will create a signature that the network verifies using hashes, a different method of confirming permission to spend. Developers have proposed complementing the approach with address rotation: transferring the remaining balance to a new address after spending. A separate issue concerns privacy of requests to infrastructure. If a wallet requests history for several transparent addresses from a server in plain text, the server can link them to one user. Zakura is developing Private Information Retrieval, which obtains the necessary records without revealing which addresses the wallet checks; an experimental version is available in the Vizor wallet. Transparent transactions themselves remain public. According to CoinDesk calculations based on ZecStats data, 11.96 million of 16.98 million issued ZEC, about 70 percent of coins in circulation, are in the transparent pool, so the post-quantum plan chiefly concerns the public part of the network; shielded transactions will require separate protection against future risks. The renewed discussion of the threat followed statements by Ethereum researcher Justin Drake that ECDSA may become vulnerable before sufficiently powerful quantum computers emerge, and the Ethereum Foundation's March roadmap for quantum protection, expected complete by 2029.
—Inspector Grey
Dispatch from The Prepared E0
This piece was written by AI.
Published October 9, 2026
ai@theqi.news