Jul 30, 2026 · 9 min · 13 segments
Zcash activated its Ironwood upgrade, sealing roughly $1.7 billion in ZEC behind a one-way turnstile after a researcher found a flaw that could have minted counterfeit coins. Here’s everything you…
Jennifer SanasieHost
All right, Zcash activated its Ironwood upgrade this week, retiring Orchard, the shielded pool that held 3.66 million ZEC, worth roughly $1.7 billion.
The only way out is through a turnstile, an accounting rule that caps total withdrawals at exactly the amount that was verifiably deposited.
So why lock $1.7 billion in the first place? Back in May, a Shielded Labs researcher named Taylor Hornby found a flaw in Orchard's proof circuit.
The bug could have let someone mint counterfeit ZEC, and because Orchard hides every amount and participant, it would've left no trace on chain.
The bug went four years undetected, being live since Orchard launched in 2022.
When the news broke, ZEC dropped almost 40%, though it recovered and is up roughly tenfold over the past year.
If someone had minted fake coins, the logical move would've been to cash out, and that would show funds leaving the pool.
Instead, Orchard's balance grew steadily the whole time, even through last year's price run when selling would've been most profitable.
Because a zero knowledge proof reveals nothing beyond what it's verifying, the chain holds no record of whether a counterfeit coin was ever created.
Money crossing in or out of a shielded pool is public, even when the transactions inside aren't.
The network knows exactly how much ZEC went into Orchard, and it will not release more than that.
Its records are built to stay recoverable if quantum computers eventually break today's cryptography, and its proof circuit is being formally verified, a mathematical proof that the code behaves correctly in every possible case, not just the ones a tester thought to check.
The whole point is to rule out the class of bug that was identified in Orchard.
All right, Zcash activated its Ironwood upgrade this week, retiring Orchard, the shielded pool that held 3.66 million ZEC, worth roughly $1.7 billion.
The only way out is through a turnstile, an accounting rule that caps total withdrawals at exactly the amount that was verifiably deposited.
So why lock $1.7 billion in the first place? Back in May, a Shielded Labs researcher named Taylor Hornby found a flaw in Orchard's proof circuit.
The bug could have let someone mint counterfeit ZEC, and because Orchard hides every amount and participant, it would've left no trace on chain.
The bug went four years undetected, being live since Orchard launched in 2022.
When the news broke, ZEC dropped almost 40%, though it recovered and is up roughly tenfold over the past year.
If someone had minted fake coins, the logical move would've been to cash out, and that would show funds leaving the pool.
Instead, Orchard's balance grew steadily the whole time, even through last year's price run when selling would've been most profitable.
Because a zero knowledge proof reveals nothing beyond what it's verifying, the chain holds no record of whether a counterfeit coin was ever created.
Money crossing in or out of a shielded pool is public, even when the transactions inside aren't.
The network knows exactly how much ZEC went into Orchard, and it will not release more than that.
Its records are built to stay recoverable if quantum computers eventually break today's cryptography, and its proof circuit is being formally verified, a mathematical proof that the code behaves correctly in every possible case, not just the ones a tester thought to check.
The whole point is to rule out the class of bug that was identified in Orchard.
The rest of this transcript — segmented and speaker-labeled, so you land on the exact moment something was said
Search every transcript — by keyword, by phrase, or by meaning, across every show Radar indexes
Trends — what is surging across podcasts, measured against its own baseline
Alerts — when a name you follow appears in a newly indexed episode
No account is needed to search Radar.
