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Vitalik Buterin Donates to Shielded Labs for Zcash Crosslink Security Upgrade

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TLDR:

  • Buterin’s donation funds Crosslink development from prototype to incentivized testnet and production phase. 
  • Crosslink adds finality layer to Zcash’s PoW chain, preventing reversals and strengthening settlement guarantees. 
  • The upgrade enables shorter exchange confirmations and improves cross-chain integration reliability for Zcash. 
  • Shielded Labs operates independently from Zcash Dev Fund, relying on donations from network supporters.

 

Ethereum co-founder Vitalik Buterin has donated to Shielded Labs to advance Crosslink development for Zcash. The contribution will fund progression from prototype to incentivized testnet and production readiness.

Crosslink adds a finality layer to Zcash’s proof-of-work consensus, protecting against chain reorganizations and rollback attacks. This marks Buterin’s second donation to the organization.

Crosslink Enhances Zcash Security Architecture

Shielded Labs announced the donation will support Crosslink’s continued development. The upgrade strengthens Zcash’s existing proof-of-work consensus through a parallel finality layer.

Block production and economic activity remain on the proof-of-work chain. Meanwhile, the finality gadget anchors blocks and provides stronger settlement guarantees.

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The architecture prevents confirmed transactions from being reversed. This reduction in double-spend risk increases confidence in transaction settlement across the network.

Exchanges can implement shorter confirmation requirements as a result. Cross-chain integrations gain improved reliability through the enhanced security model.

Applications requiring predictable settlement benefit from the increased consistency. The improvements facilitate easier integration into the broader crypto ecosystem.

Zcash maintains its existing security properties throughout the upgrade process. The design preserves the network’s core characteristics while adding protective measures.

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Commenting on the donation, Buterin stated that Zcash is one of the most honorable crypto projects. He praised the network’s steadfast focus on privacy as a defining characteristic.

According to Buterin, Shielded Labs’ Crosslink work will allow Zcash to be more secure. The upgrade will enable operation on a lower security budget, supporting long-term sustainability.

Production Phase Will Focus on Technical Readiness

The donation will fund the productization of the existing Crosslink prototype. Shielded Labs plans to launch a persistent, incentivized testnet where participants can earn ZEC.

The transition into productionization involves multiple technical components. Design specifications require completion before mainnet consideration.

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Security analysis will form a critical component of the development process. Audits will verify the robustness of the finality layer implementation.

Coordination with wallets and infrastructure providers ensures smooth integration. Proactive engagement with the Zcash community maintains transparency throughout development.

Progress toward mainnet activation depends on several factors. Technical readiness must meet established standards before deployment.

Security review processes need completion to validate the upgrade’s safety. Broad community support remains essential for major protocol changes.

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Shielded Labs operates as a Swiss-based Zcash support organization. The team focuses on protocol development projects that strengthen network security.

Funding comes from donations by Zcash holders and supporters. The organization maintains independence from the Dev Fund and block rewards.

Buterin’s first contribution in 2023 supported formation of a dedicated Crosslink team. He has contributed to discussions around protocol design and security for years.

Shielded Labs acknowledged his continued engagement with the Zcash ecosystem. The organization expressed appreciation for his support in advancing network resilience.

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Crypto World

Tether Freezes $544M in Crypto Tied to Turkish Illegal Betting Probe

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Tether Freezes $544M in Crypto Tied to Turkish Illegal Betting Probe

Tether has frozen more than half a billion dollars in cryptocurrency at the request of Turkish authorities, blocking funds tied to an alleged illegal online betting and money-laundering operation.

Last week, prosecutors in Istanbul announced the seizure of approximately €460 million ($544 million) in assets belonging to Veysel Sahin, accused of operating unlawful betting platforms and laundering proceeds. Officials initially declined to identify the crypto firm involved, but the company was Tether Holdings SA, the issuer of the $185 billion USDt (USDT) stablecoin, CEO Paolo Ardoino told Bloomberg.

“Law enforcement came to us, they provided some information, we looked at the information and we acted in respect of the laws of the country,” Ardoino reportedly said. “And that’s what we do when we work with the DOJ, when we work with the FBI, you name it,” he added.

The action came as part of a broader investigation targeting underground gambling and payment networks in the country. Turkey has already seized more than $1 billion in assets through related probes, according to Bloomberg.

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Related: Tether releases open-source operating system for Bitcoin mining

Tether, Circle blacklist 5,700 wallets

According to analytics firm Elliptic, stablecoin issuers, primarily Tether and Circle, had blacklisted about 5,700 wallets containing roughly $2.5 billion by late 2025. About three-quarters of those addresses held USDT at the time they were frozen.

Tether also told Bloomberg that it has assisted authorities in more than 1,800 investigations across 62 countries, resulting in $3.4 billion in frozen USDT connected to alleged criminal activity.

Despite the cooperation, USDt continues to attract scrutiny. US prosecutors last month charged a Venezuelan national with laundering $1 billion, largely using the token, while blockchain researchers have linked large USDt transactions to sanctions-evasion activity.

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A forensic map tracing laundered crypto from a suspect to exchanges. Source: Elliptic

Last year, Bitrace also reported that $649 billion in stablecoins, or about 5.14% of total stablecoin transaction volume, flowed through high-risk blockchain addresses in 2024, with Tron-based USDt accounting for more than 70% of the activity.

Related: Tether CEO denies the company ever planned $20B raise

Tether’s USDT hits $187B market cap

As Cointelegraph reported, Tether’s USDt reached a record $187.3 billion market capitalization in the fourth quarter of 2025, growing by $12.4 billion despite a broader crypto downturn triggered by October’s liquidation cascade. While USDt expanded, rival stablecoins struggled, with Circle’s USDC (USDC) ending the quarter largely flat and Ethena’s USDe losing about 57% of its value.