Shielded Labs is excited to announce that Vitalik Buterin has made a donation to support the continued development of Crosslink, a security-focused upgrade to Zcash’s consensus architecture. The contribution will be used to advance Crosslink from its current prototype stage toward a persistent, incentivized testnet and eventual production readiness.
Crosslink strengthens Zcash’s existing Proof-of-Work consensus by adding a parallel finality layer that protects against chain reorganizations and rollback attacks. All block production and economic activity continue to occur on the PoW chain, while the finality gadget anchors blocks and provides stronger settlement guarantees. By ensuring that confirmed transactions cannot be reversed, Crosslink reduces double-spend risk and increases confidence in transaction settlement. Stronger finality allows for shorter confirmation requirements for exchanges, improves reliability for cross-chain integrations, and provides the consistency required by applications that depend on predictable settlement. These improvements make Zcash easier to integrate into the broader crypto ecosystem while maintaining its existing security properties.
Vitalik’s donation will be used to support the productization of the existing Crosslink prototype, including the launch of a persistent, incentivized testnet where participants can earn ZEC, as well as the transition into a productionization phase. This phase will focus on design specifications, security analysis, audits, coordination with wallets and infrastructure providers, and proactive engagement with the Zcash community. As with all major protocol changes, progress toward mainnet activation will depend on technical readiness, security review, and broad community support.
Commenting on the donation, Vitalik said, “Zcash is one of the most honorable crypto projects with a steadfast focus on privacy. Shielded Labs’ Crosslink work will allow Zcash to be more secure and on a lower security budget, supporting its long-term sustainability.”
Shielded Labs is a Swiss-based Zcash support organization building unstoppable private money. We focus on protocol development projects that strengthen the long-term security and sustainability of the Zcash network. Shielded Labs is funded by donations from Zcash holders and supporters and operates independently of the Dev Fund and block rewards. This donation marks Vitalik’s second contribution to Shielded Labs; his first, made in 2023, supported the formation of a dedicated team focused on Crosslink.
Shielded Labs would like to thank Vitalik for his continued support of Zcash. He has been a long-time supporter of the project and has contributed to discussions around protocol design and security over many years. We appreciate his continued engagement with the Zcash ecosystem and his willingness to help advance work that makes Zcash stronger and more resilient.