--- title: "Zcash developer flags quantum linkability risk in shielded swaps" language: en canonical: "https://whycoinmoves.com/en/events/zcash-f9c696fb4b3c84" published: 2026-10-20T05:36:57.000Z updated: 2026-10-20T07:18:06.000Z indexable: false --- # Zcash developer flags quantum linkability risk in shielded swaps Attributed sources: [Decrypt]() ## Key facts A Decrypt report describes a Zakura proposal to fix a quantum-computing risk in Zcash shielded swaps, saying a single published address could let a future quantum attacker link every payment a wallet has ever received. The report is from an independent outlet, not an official Zcash statement, and the underlying proposal has not been independently verified here. News evidence score: 30/100 from 1 publisher group(s) (Decrypt); this measures source completeness, not truth or causation. After site detection, observed returns were 5 minutes: +0.51% (difference from BTC +0.40 pp; 20/10/2026, 13:37 → 20/10/2026, 13:44, UTC+8; OKX · USDT); 1 hour: -0.39% (difference from BTC -0.29 pp; 20/10/2026, 13:37 → 20/10/2026, 14:38, UTC+8; OKX · USDT). Unlisted windows are unavailable. In the preceding 30 days, the 99th percentile of absolute hourly returns was 4.07% (OKX · USDT; cutoff 20/10/2026, 13:36, UTC+8). This hourly baseline is not directly comparable with a minute move. ## Returns after site detection | Window | Return | BTC | Difference from BTC | Actual sampled interval (UTC+8) | Source | | --- | --- | --- | --- | --- | --- | | 5 minutes | +0.51% | +0.11% | +0.40 pp | 20/10/2026, 13:37 → 20/10/2026, 13:44 | OKX · USDT | | 1 hour | -0.39% | -0.10% | -0.29 pp | 20/10/2026, 13:37 → 20/10/2026, 14:38 | OKX · USDT | | 24 hours | — | — | — | — | — | ## Historical hourly baseline | Metric | Value | | --- | --- | | Ready | true | | Coverage | 99.9% (719/720) | | Median absolute hourly return | 0.55% | | 99th percentile of absolute hourly returns | 4.07% | | BTC beta | 1.87 | | Source / cutoff (UTC+8) | OKX · USDT / 20/10/2026, 13:36 | ## Claims and open questions - Zakura has proposed a fix to stop quantum computers from linking shielded swaps. - According to the report, a single published Zcash address could let a future quantum attacker link every payment a wallet has ever received. - Whether the proposed fix has been reviewed or accepted by Zcash maintainers. - Whether the described linkability risk has been independently reproduced or verified. - What concrete implementation or timeline, if any, exists for the proposal. ## Source evidence - [Zcash Developer Zakura Proposes Fix to Stop Quantum Computers Linking Shielded Swaps]() — Decrypt; published 19/10/2026, 18:11; received 20/10/2026, 13:36 (UTC+8). ## Recent ZEC events and market reactions - [Full coin archive]() [Methods and limitations]() Publisher count is not independent evidence count. Price changes cannot verify news or prove causation.