Zcash has completed a two-phase emergency network upgrade to fix a critical 
vulnerability in its Orchard shielded pool — a flaw that sat undetected for 
four years, could theoretically have allowed unlimited undetectable 
counterfeit ZEC creation, and triggered a 50% price collapse before the 
network&#8217;s swift response began restoring confidence and driving a recovery in 
ZEC&#8217;s price. Related Reading: Analyst Charts Ethereum Long-Term Roadmap To 
$16,000 – There’s No Need To Panic Josh Swihart, CEO of Electric Coin Company 
— the primary developer of Zcash — posted on X on June 7 confirming the fix 
was complete and the network secure, as ZEC began its recovery from the lows 
reached after the vulnerability&#8217;s disclosure. The post arrived at a critical 
moment for the asset: ZEC had crashed approximately 50% from a June 4 peak of 
$624 to $309 on June 5, wiping more than $3 billion from its market 
capitalization, per the BitMEX Blog&#8217;s documented timeline of the incident. 
ZEC&#8217;s price trends to the upside over the past 48 hours, as seen on the daily 
chart. Source: ZECUSD on Tradingview How The Zcash Bug Was Found — And What It 
Was The vulnerability was discovered on May 29, 2026 by security researcher 
Taylor Hornby during a protocol audit commissioned by Shielded Labs. Hornby 
identified a &#8220;soundness&#8221; flaw in Zcash&#8217;s Orchard zero-knowledge proof circuit 
— specifically an under-constrained element in the Orchard Action circuit that 
could allow invalid state transitions, creating a theoretical double-spending 
risk within the shielded pool. The discovery was made using Anthropic&#8217;s Claude 
Opus 4.8 AI model alongside a custom analysis suite, per Shielded Labs&#8217; 
official disclosure. Hornby and the AI developed a working proof-of-concept 
that successfully generated unlimited, completely undetectable counterfeit ZEC 
in a local test environment — described by one independent analyst as &#8220;about 
the worst kind of bug a cryptocurrency can have,&#8221; per Yahoo Finance&#8217;s 
reporting of the disclosure. Critically, the flaw did not permit inflation of 
the total ZEC supply on the live network. Zcash&#8217;s internal turnstile 
accounting mechanism — which tracks the total value moving into and out of the 
shielded pool — confirmed no unauthorized value creation occurred while the 
flaw was active, per Shielded Labs&#8217; official statement. However, the 
organization acknowledged directly that due to the privacy properties of 
Orchard and the nature of the bug, there is no definitive cryptographic way to 
determine whether exploitation occurred — a limitation inherent to the 
shielded pool&#8217;s design that became its own source of market concern. The 
vulnerability had been present since Orchard&#8217;s activation in May 2022 — four 
years — without detection. The Emergency Response Zcash&#8217;s development 
ecosystem responded with unusual speed. The first phase was an emergency soft 
fork deployed through Zebra 4.5.3, activated at block 3,363,426 on June 2, 
which temporarily disabled all Orchard transactions to remove the attack path 
while developers prepared the permanent fix. Transparent and Sapling 
transactions continued operating normally throughout, per the Zcash 
Foundation&#8217;s official announcement on X. The second phase arrived on June 3 
through the NU6.2 hard fork — activated at block 3,364,600 via Zebra 5.0.0 — 
which introduced a corrected circuit and a new verifying key, patching the 
flaw and re-enabling Orchard transactions, per the Foundation. The market&#8217;s 
initial reaction to the hard fork was positive. ZEC rose from $544 on June 2 
to $603 on June 3, continuing to $624 on June 4 — its highest level since the 
rally began. Then Arthur Hayes publicly disclosed he had exited his entire ZEC 
position intraday on June 4 — the same day as the peak — citing five macro 
factors including higher energy prices and upcoming AI IPOs, per his X post 
covered in prior reporting. The combination of Hayes&#8217; exit and lingering 
uncertainty about whether exploitation had occurred before the patch sent ZEC 
to $309 on June 5. The Recovery And What It Means Swihart&#8217;s June 7 X post — 
reassuring the community that total ZEC supply remained intact throughout and 
that the network had passed through the emergency without confirmed 
exploitation — appears to have been the catalyst for the recovery now 
underway. The swift two-phase response, combined with the Foundation&#8217;s 
transparent disclosure and Swihart&#8217;s direct communication, provided the 
confidence signal the market needed. This development marks a pivotal and 
genuinely uncomfortable moment for Zcash&#8217;s long-term positioning in the 
nascent sector. A four-year-old vulnerability in the Orchard pool — the very 
component that defines ZEC&#8217;s core privacy value proposition — has been fixed 
cleanly and without confirmed exploitation. Related Reading: Has The Bitcoin 
Price Crash Ended Or Is This Just The Beginning? Analyst Answers But the 
structural irony that the privacy properties that make Zcash valuable also 
make it impossible to confirm the vulnerability was never used will remain a 
question mark the community will need to address as the recovery continues. As 
of this writing, ZEC trades at around $430, recovering from its June 5 lows as 
confidence in the network&#8217;s security response gradually rebuilds. Cover image 
from Grok, ZECUSD Chart from Tradingview

Zcash has completed a two-phase emergency network upgrade to fix a critical vulnerability in its Orchard shielded pool — a flaw that sat undetected for four years, could theoretically have allowed unlimited undetectable counterfeit ZEC creation, and triggered a 50% price collapse before the network&#8217;s swift response began restoring confidence and driving a recovery in &#8230;

Zcash Crashed 50% On A Four-Year-Old Secret — The Recovery Has Quietly Begun

The study suggests that optimizing training data frequency could enable 
smaller AI models to learn complex tasks, impacting future model design.
The post Stanford, MIT, Harvard, Anthropic study reveals why larger models 
learn rare tasks better appeared first on Crypto Briefing.

The study suggests that optimizing training data frequency could enable smaller AI models to learn complex tasks, impacting future model design. The post Stanford, MIT, Harvard, Anthropic study reveals why larger models learn rare tasks better appeared first on Crypto Briefing.

Stanford, MIT, Harvard, Anthropic study reveals why larger models learn rare tasks better

Yuga Labs&#8217; intervention highlights the critical need for robust security 
measures in NFT and DeFi protocols to prevent asset vulnerabilities.
The post Yuga Labs rescues 68 at-risk NFTs from Flooring Protocol exploit 
appeared first on Crypto Briefing.

Yuga Labs&#8217; intervention highlights the critical need for robust security measures in NFT and DeFi protocols to prevent asset vulnerabilities. The post Yuga Labs rescues 68 at-risk NFTs from Flooring Protocol exploit appeared first on Crypto Briefing.

Yuga Labs rescues 68 at-risk NFTs from Flooring Protocol exploit

The decline in software buyouts signals potential long-term shifts in 
investment strategies and market dynamics due to AI&#8217;s disruptive impact.
The post Software buyout deals fall to lowest level since pandemic as AI fears 
freeze dealmaking appeared first on Crypto Briefing.

The decline in software buyouts signals potential long-term shifts in investment strategies and market dynamics due to AI&#8217;s disruptive impact. The post Software buyout deals fall to lowest level since pandemic as AI fears freeze dealmaking appeared first on Crypto Briefing.

Software buyout deals fall to lowest level since pandemic as AI fears freeze dealmaking

The compromise of private keys belonging to a member of the Humanity 
Foundation has reportedly resulted in the theft of at least $30 million worth 
of its native token.

The compromise of private keys belonging to a member of the Humanity Foundation has reportedly resulted in the theft of at least $30 million worth of its native token.

Humanity Protocol token falls 85% amid $30M private key exploit

The potential sale of Gen II Fund Services highlights the increasing value and 
demand for specialized fund administration amid growing private capital 
markets.
The post Hg-backed Gen II Fund Services explores $6B sale in major fund 
administration deal appeared first on Crypto Briefing.

The potential sale of Gen II Fund Services highlights the increasing value and demand for specialized fund administration amid growing private capital markets. The post Hg-backed Gen II Fund Services explores $6B sale in major fund administration deal appeared first on Crypto Briefing.

Zcash Crashed 50% On A Four-Year-Old Secret — The Recovery Has Quietly Begun

Comments