# Q4 2026 Coinholder-Directed Retroactive Grant Program - Call for Proposals **URL:** \ **Category:** Retroactive Grants\ **Created:** [October 30, 2026, 11:17am UTC](https://forum.zcashcommunity.com/t/q4-2026-coinholder-directed-retroactive-grant-program-call-for-proposals/58598 "2026-10-30T11:17:25Z")\ **Posts on this page:** 1\ **Showing post:** 27
**Author:** ![craftsoldier](https://sea2.discourse-cdn.com/zcash/user_avatar/forum.zcashcommunity.com/craftsoldier/32/43096_2.png) [@craftsoldier](https://forum.zcashcommunity.com/u/craftsoldier)\ **Post date:** [November 12, 2026, 2:24pm UTC](https://forum.zcashcommunity.com/t/q4-2026-coinholder-directed-retroactive-grant-program-call-for-proposals/58598/27 "2026-11-12T14:24:06Z")
Hi! Here’s the submission links for my second Q4 application, a Low severity block suppression vulnerability in Zebra reported to the Zcash Foundation through responsible disclosure, and my IPv6 peer limit fix that the Foundation built on to patch a Medium severity advisory GitHub: [Retroactive Grant Application - Zebra Block Suppression (Low) and IPv6 Ban Evasion Fix (Medium) · Issue #111 · Financial-Privacy-Foundation/ZcashCoinholderGrantsProgram · GitHub](https://github.com/Financial-Privacy-Foundation/ZcashCoinholderGrantsProgram/issues/111) Forum thread: [Retroactive Grant Application - Zebra Block Suppression (Low) and IPv6 Ban Evasion Fix (Medium)](https://forum.zcashcommunity.com/t/retroactive-grant-application-zebra-block-suppression-low-and-ipv6-ban-evasion-fix-medium/59237/1) GHSA (Low): [Coinbase scriptSig rewrite drops a gossiped block on the inbound path without penalizing the supplying peer · Advisory · ZcashFoundation/zebra · GitHub](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-4f6v-mj46-gxg3) GHSA (Medium): [Peer bans are keyed per exact IP address and are ineffective against IPv6 peers · Advisory · ZcashFoundation/zebra · GitHub](https://github.com/ZcashFoundation/zebra/security/advisories/GHSA-jhpp-8h75-7pv5) --- _[View the full topic](https://forum.zcashcommunity.com/t/q4-2026-coinholder-directed-retroactive-grant-program-call-for-proposals/58598)._