Data & Insights: Claude Finds Zcash Bug; BTC ETF Exit

Deadly Orchard

• On Thursday, June 4th, a vulnerability involving Zcash’s Orchard circuit was disclosed, causing the price of ZEC to lose half its value within 48 hours.
  • For context, an auditing framework built using Anthropic’s Claude Opus 4.8 identified two lines of code in the Orchard proof system that allowed invalid inputs to pass a check they should have failed.
  • In simpler terms, this bug could have allowed anyone to mint unlimited amounts of ZEC inside the shielded pool, with no on-chain evidence and no signature trail.
  • The bug had been live since Orchard's launch, roughly 49 months, and had survived multiple human audits during that time.
  • The reason it was a crisis-tier disclosure was that if the bug had been found by a bad actor prior to this, they could have spent four years quietly producing fake ZEC, withdrawing it to exchanges, and selling it for real money.
  • And no one would have known because the entire point of the shielded pool is that no one can see what is inside it.
• On a positive side, the reason this is not a total catastrophe is a Zcash protocol feature called turnstile accounting.
  • Every shielded pool has a hard ceiling: The total ZEC that can ever come out is capped at the total ZEC that ever went in. The protocol tracks this number independently of the privacy proofs themselves.
  • After the exploit was identified, the Zcash Foundation checked the turnstile balance for Orchard and found no value had been created beyond what had been legitimately deposited.
  • This means no one had used the exploit against the live network during the four years it was open, which is the single most important reason ZEC did not go to zero.
• Though, regardless of this, the impact on the price of ZEC and on ZEC ETFs had already been done.
  • The Grayscale Zcash Trust (ZCSH) saw nearly $19 million in volume on June 5, its highest-ever single-day figure.
  • This volume likely reflects panic-selling by holders who could not access on-chain shielded venues, as the Orchard pool was disabled by a soft fork for roughly 24 hours during the fix, and opportunistic buying by funds that wanted ZEC exposure during a 50% drawdown.
• The second-order effect from all this is how AI is advanced enough that AI-assisted security audits work, thereby significantly reducing the cost and difficulty of finding bugs for crypto teams.
  • However, on the other hand, the same toolchain is available to anyone with API access, meaning a bad actor who finds a bug themselves could choose to exploit it rather than disclose it.
  • None of this necessarily means a wave of AI-found exploits on crypto is imminent, but it sure means the historical assumption that "audited" code is broadly safe needs to be revisited.

UMAmi

• Polymarket's “Crypto” category hit $209 million of volume on Wednesday, June 3rd, a single-day record and almost 5x last month’s daily average
  • The category also saw over $566 million within the first 4 days of June, equivalent to nearly 40% of its trailing 12-month total.
  • The majority of this volume came from a single market: “MicroStrategy sells any Bitcoin by May 31, 2026?”
  • The reason behind this specific market’s astronomic level of attention was due to a dispute on the resolution’s conditions.
• For context, Strategy disclosed a 32 BTC sale in an 8-K filed June 1, about 24 hours after the Polymarket’s May 31st 11:59 pm ET deadline.
  • Despite Strategy’s sale of their BTC technically occurring prior to May 31, the disputing side argued that because the sale was disclosed after the deadline, the market should resolve to NO.
  • Roughly 99% of the market’s trailing 7-day volume came after the dispute opened, meaning the market mechanically converted from a binary on Strategy's behavior into a meta-market on how UMA token holders would interpret the conditions of the market’s resolution.
  • In the end, UMA, with a 98.6% vote, decided on NO, in which this decision may have created a precedent that filing-date governs over execution-date for corporate disclosure markets, which materially changes the risk profile for any contract that depends on SEC, court, or government-agency publication timing in the future.

BTC ETF Run

• Spot Bitcoin ETF flows have now recorded back-to-back weeks of outflows exceeding $1 billion, with last week printing -$1.40B and the prior week -$1.42B. The consecutive drawdowns mark some of the most significant sustained outflow pressure the products have seen since January, when comparable levels briefly rattled the market before flows normalized.
  • Bitcoin's price briefly dipped below $60,000 on Friday, coinciding with the second consecutive week of heavy outflows, reinforcing the reflexive relationship between ETF flow data and spot price action.
• GBTC remains the dominant source of outflows, continuing a pattern that has persisted since the product converted from a trust structure. While the pace of GBTC redemptions had slowed considerably in prior months, the recent acceleration suggests renewed exit pressure.
• The back-to-back outflow weeks are a reminder that ETF flows have increasingly become a primary lens through which both institutional and retail participants express directional views on Bitcoin, with redemptions serving as a more accessible and visible short signal than direct spot selling.
  • That structural shift cuts both ways. Sustained outflows from ETF vehicles can amplify downside price pressure beyond what the underlying spot demand alone would imply.
• Whether this mirrors January's temporary outflow episode or marks the beginning of a more sustained rotation out of the products will likely depend on broader sentiment and where BTC stabilizes in the near term. For now, investors are watching closely for a reaction from DATs.

 Crypto Who?

• Tokenized stocks, the fourth-largest RWA category by market cap, have grown from $2.23B to $5.5B since the start of the year, a roughly 147% increase in six months. The trajectory reflects a broader shift in how crypto-native users are seeking equity exposure, increasingly through onchain instruments rather than traditional brokerage accounts.
  • The growth signals a structural demand trend as crypto users want access to equity markets. Exchanges are responding by embedding stock products directly into their existing platforms rather than ceding that flow to traditional finance.
  • Kraken's and Bybit's decision to offer the SpaceX IPO natively on their platforms is a pointed example of this dynamic, allowing their user base to access one of the most anticipated private-to-public transitions in recent memory without leaving the crypto ecosystem.
• Binance has similarly moved in this direction, offering stock perpetual products to its non-US user base, tapping into a segment of retail demand that has historically had limited or friction-heavy access to US equity markets.
  • The SpaceX case is particularly illustrative of the addressable opportunity. Pre-IPO and IPO-adjacent exposure has traditionally been gated behind institutional relationships or secondary market brokers. Tokenization lowers that barrier materially.
• Sustained growth in this category would suggest tokenized equities are becoming a durable product line rather than a speculative footnote within the broader RWA narrative.

Do You Prefer BMNR?

• The percentage of ETH supply held by public companies has climbed steadily to just under 6%, driven primarily by BitMine Immersion (BMNR), which now holds 5.42M ETH and stands as the dominant corporate accumulator of the asset. The trajectory mirrors the early MicroStrategy playbook, but is now showing some of the same structural stress points that the model carries.
  • BMNR has filed to issue $300M in preferred shares at a 9.5% yield, with proceeds earmarked for further ETH purchases. The offering structure is notable given that Strategy's preferred share STRC has struggled to maintain its peg and may need to hike its dividend rate to attempt to repeg.
  • The STRC situation serves as a relevant cautionary parallel: when underlying asset prices soften, the fixed-yield obligations of preferred structures can become difficult to service, particularly when NAV premiums compress alongside the token price.
  • However, with Ethereum, BMNR generates yield through staking, which alleviates some of the perpetual dividend stress.
• That dynamic is playing out more broadly across the DAT space. As ETH and other digital asset prices have pulled back in recent weeks, companies running leveraged accumulation strategies have seen both their stock prices and NAV premiums decline meaningfully, reflecting market skepticism toward the leverage they are deploying at current levels.
• The steady climb in corporate ETH concentration also raises a longer-term supply dynamic worth monitoring. 6% of the circulating supply held by a small number of public vehicles represents a meaningful concentration risk if sentiment shifts and liquidations become necessary.
• Whether BMNR's preferred offering finds sufficient demand at 9.5% will be an early signal of how much appetite remains for the levered DAT structure in the current environment.