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ZKsync and Phylax Launch Bank Stack: A Full-Scale Institutional Architecture Built on Ethereum

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TLDR:

  • Bank Stack operates across three integrated planes: blockchain platform, money and assets, and services and governance layer.
  • Prividium enables institutions to run private, compliant transactions while inheriting Ethereum’s security and global settlement guarantees.
  • Phylax adds pre-committed assertions and circuit breakers that block unsafe transactions before execution, not after settlement occurs.
  • Platforms like Fireblocks already integrate with Prividium, letting banks reuse existing policy stacks for new institutional networks.

Bank Stack is emerging as a new institutional architecture for on-chain finance. ZKsync and Phylax have jointly introduced this framework, anchored on Ethereum and powered by Prividium.

The architecture is designed to address fragmented payment rails, rising compliance costs, and security risks. Financial institutions are no longer debating whether blockchain matters.

They are now choosing which architecture will run their settlement, liquidity, and balance sheet operations.

A Three-Layer Architecture Built for Institutions

Bank Stack operates across three integrated planes. The blockchain platform layer combines Ethereum with Prividium for private execution, compliance primitives, and interoperability.

Above that sits the money and assets layer, which covers tokenized deposits, stablecoins, and real-world assets. The third plane handles services and governance, including identity, custody, policy enforcement, and reporting.

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Prividium serves as the institutional transaction layer at the foundation. It is a private, compliant, ZK-powered blockchain that remains anchored to Ethereum.

Institutions run confidential transaction environments while inheriting Ethereum’s security and global interoperability. Execution and data stay private, while ZK proofs posted to Ethereum provide integrity and finality.

ZKsync’s L1 interoperability solution connects any ZK Chain to Ethereum natively. Institutions no longer need to sacrifice governance, privacy, or execution environments for access to public market liquidity.

Prividiums become the first architecture where both can coexist. This removes one of the largest structural barriers to institutional blockchain adoption.

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Compliance is built into the infrastructure surface rather than added on top. Prividiums embed permissioned participation, KYC/AML enforcement, and auditability directly into the system.

This shifts compliance from an operational burden to an architectural guarantee. Policy becomes enforceable in production, not just observable.

Circuit Breakers and Onchain Money Primitives

ZKsync shared via its official channel: “The Bank Stack is not a product. It is an institutional architecture for on-chain finance.” Phylax adds execution-time controls through pre-committed assertions and invariant enforcement during block building.

Transactions that violate safety conditions are excluded before execution. This prevents catastrophic states rather than detecting them after settlement.

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Phylax also supports on-premises deployment, colocated with block production. There is no critical-path SaaS dependency and no custody of keys or funds.

Private assertions keep internal controls confidential inside an institution. Risk teams, underwriters, and regulators can use verifiable evidence for governance and coverage workflows.

The monetary foundation of Bank Stack includes tokenized deposits, fiat-backed stablecoins, and tokenized cash equivalents. These primitives compose with identity and policy controls.

Real-world assets such as tokenized securities, funds, and collateralized instruments are also supported. Platforms like Fireblocks already integrate with Prividium, allowing banks to reuse existing policy stacks.

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Together, Ethereum provides global settlement, Prividium provides private execution, and Phylax provides deterministic operational controls.

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Bitcoin Spikes as US Supreme Court Strikes Down Trump Tariffs

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Bitcoin Spikes as US Supreme Court Strikes Down Trump Tariffs

In a landmark 6–3 decision, the Supreme Court of the United States has ruled that President Donald Trump’s sweeping global tariffs were illegal, delivering a sharp blow to one of the White House’s core economic policies.

The decision immediately lifted risk appetite across financial markets — including crypto — though traders remain cautious about what comes next.

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Bitcoin ETFs Near Five-Week Outflow Streak With $404M Outflows

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Bitcoin ETFs Near Five-Week Outflow Streak With $404M Outflows

Selling pressure in US-listed spot Bitcoin ETFs continued Thursday, with analysts noting the cryptocurrency is on track for one of its worst yearly starts.

Spot Bitcoin (BTC) ETFs saw $165.8 million in outflows Thursday, bringing weekly losses to $403.9 million, according to SoSoValue data.

The redemptions moved the funds closer to a possible five-week outflow streak, with year-to-date (YTD) losses totaling $2.7 billion.

Daily flows in US spot Bitcoin ETFs this week. Source: SoSoValue

Trading activity continued to shrink, falling 21% over the week and reaching its lowest levels since late December, signaling weakening investor activity.

Despite $53.9 billion in cumulative net inflows, analysts, including DropsTab, noted that 2026 is shaping up to be “one of the worst yearly starts in Bitcoin’s history,” with BTC prices down about 22% year-to-date, according to TradingView data.

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BlackRock’s IBIT leads losses with $368 million in outflows this week

BlackRock’s iShares Bitcoin Trust ETF (IBIT) accounted for the bulk of outflows this week, totaling $368 million, according to Farside data.

Other US-listed spot Bitcoin ETFs saw little or no activity this week, aside from about $50 million in outflows from the Fidelity Wise Origin Bitcoin Fund (FBTC) on Wednesday.

Daily flows in US spot Bitcoin ETFs by issuer. Source: Farside.co.uk

Some major financial institutions reported reducing IBIT exposure earlier this week, with Brevan Howard cutting its holding in the fund by as much as 85% in the fourth quarter of 2025.

Bitcoin set for one of its worst yearly starts

The ongoing outflows from Bitcoin ETFs coincide with weakening investor sentiment, as multiple sources point to unusually low BTC price levels compared to previous cycles.

Drops Analytics highlighted Bitcoin’s price in the context of halving — an event that reduces BTC’s block reward once every four years and is typically followed by price surges in the years that follow.

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Analysis, Bitcoin Price, Ethereum ETF, Bitcoin ETF
Source: Drops Analytics

“Almost two years later, BTC trades around $66,000 — nearly the same level as during the April 2024 halving,” Drops Analytics said in a Telegram post on Thursday.

Related: Quantum fears aren’t behind Bitcoin’s 46% drop, says developer

“This has never happened before. In previous cycles, BTC was already three to 10 times above halving levels by now,” it added.

According to Checkonchain data, Bitcoin is off to its worst yearly start on record, 50 days into 2026, surpassing previous down years, including 2018.

Magazine: Did a Hong Kong fund kill Bitcoin? Bithumb’s ‘phantom’ BTC: Asia Express

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