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Project Tachyon: Scaling Zcash with Oblivious Synchronization.
seanbowe.com/blog/tachyon-s…
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Sean Bowe
2.1K posts
Sean Bowe
@ebfull
Zcash developer and crypto researcher, Encrypted Money at Planetary Scale (https://t.co/Mx9wf4StDk)
Katılım Mayıs 2014
311 Takip Edilen7.8K Takipçiler
Sean Bowe retweetledi
@LambofCrypto @CryptoWizardd in 2015, we had no clue there was $2 trillion in demand for a global, decentralized digital store of value like bitcoin. in 2015, we also thought bitcoin was, generally speaking, a private way to store and send value around the world. Zcash will benefit from now knowing better
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Sean Bowe retweetledi
🚀New paper: Private Delegation of (Non-)Membership Proof Updates in Cryptographic Accumulators
Ever tried to use accumulators in practice? Then you’ve hit the wall: every update breaks everyone’s proofs.
We fix that.
🧵1/n
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Sean Bowe retweetledi
Something deeply ironic here.
- There was an inflation bug in the "privacy" part of litecoin. (Mimble wimble isn't privacy)
- Attacker didn't withdraw funds.
- Attack was detected, and miners soft-forked to freeze the attackers funds
Seizure resistance requires privacy
Alex Shevchenko 🇺🇦@AlexAuroraDev
Yesterday @litecoin published the MWEB security incident post-mortem. Read it first if you want to follow this thread: litecoin.com/news/litecoin-… Credit to LF for the detailed report. But there's one lesson missing from "lessons learned", and it's the most important one. 🧵
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Sean Bowe retweetledi
A brief Zec recap
+ @FoundryServices launched zcash support
+@HyperliquidX and @RobinhoodApp spot listings
+ Shielded pool @ ATH
+ Cracked dev's joining the ecosystem through @ns and @zkDragon's teams
+ Zodl backed by a16z, paradigm, coinbase, etc.
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Sean Bowe retweetledi
Finally, and with some delay, the counter example of Dmitry Krachun and Stepan Kazanin is public:
eprint.iacr.org/2026/782
I am honored to have had the chance to work with such extremely talented mathematicians. We eventually stumbled about a simplified proof, which does not use any additive combinatorics.
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Sean Bowe retweetledi
Sean Bowe retweetledi
My biggest flex is that I got paid by @zooko.
My second biggest flex is that I am now hodling 10x that amount and became a zec maxi ever since.
Neoseiki 🛡️@Ne0seiki
@zooko Thank you chad ! I will hodl to these with my life. The note you added means a lot more than the amount. ❤️
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Sean Bowe retweetledi
Sean Bowe retweetledi
Security Disclosure: We've released zcashd v6.12.1, and the Zcash Foundation has released Zebra v4.3.1, addressing four vulnerabilities – including an Orchard action-encoding bug that could crash nodes and a related consensus-split issue between the two clients.
Mining pools running both implementations have already deployed patches, and we have no evidence that any of these bugs were exploited.
User funds and privacy were never at risk, and no ZEC supply inflation was possible. Please upgrade and see our blog for full details.
zodl.com/zcashd-zebra-a…
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Sean Bowe retweetledi
I finally got enough of a break from other urgent work to read something fun and informative. This new work from Roman sounds *awesome*. Two things: serious UX improvements for Zcash and a powerful new practical cryptographic tool.
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Sean Bowe@ebfull
@apruden08 @mert @pakaqe Turnstiles defend against this threat in Zcash already by capping the damage of inflation bugs, isolating them to the shielded pool they occur in. This is a general defense; merely making things quantum resistant would never fully address the problem you're pointing out.
QME
Alex’s mistake in this video clip is just that he didn’t know about turnstiles (aka blast doors). Turnstiles just contained the exposure from exactly the kind of counterfeiting bug he’s imagining here! From $5bn (ZEC mcap) to $6m (Sprout pool): shieldedlabs.net/zcash-vulnerab…
The Rollup@therollupco
Project Eleven CEO (@apruden08) reveals Zcash is not quantum resistant like Bitcoin: "A lot of this ZEC in circulation is not in a shielded pool, it's just public." "And the problem there is, taking advantage of those assumptions means not only can you potentially steal coins, but you can actually mint money and do so in a way that's totally undetectable."
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Sean Bowe retweetledi
Today we launched our new website and investor dashboard with key metrics.
We've also purchased an additional 9,163.32 ZEC at an average purchase price of $234.63 per ZEC.
This brings our total ZEC holdings to 303,906.40, at an average price of $332.83.
Onward.
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Quantum topic is too nuanced for most people, so if you omit recoverability and turnstiles, you are not accurately describing Zcash's soundness position.
Dev highlights some of the reasons why Zcash is in a great spot here, and there are many more:
Dev 🧪@zkDragon
@therollupco @apruden08 Zcash authorizes transactions with ephemeral, re-randomized keys, while the SNARK links them using symmetric primitives that are quantum-resilient. This means we can swap the SNARK at any time as quantum nears. User funds remain safely spendable throughout.
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Sean Bowe retweetledi
@therollupco @apruden08 Zcash authorizes transactions with ephemeral, re-randomized keys, while the SNARK links them using symmetric primitives that are quantum-resilient.
This means we can swap the SNARK at any time as quantum nears. User funds remain safely spendable throughout.
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Sean Bowe retweetledi
Quantum recoverability is the one big thing.
Get your funds quantum recoverable, then you can go AFK for a decade and be fine from quantum computers.
The plan for non-QR funds is already known, and as a user you have a seemless update to get QR. (Update your wallet + 1 tx)
Dev 🧪@zkDragon
@therollupco @apruden08 Zcash authorizes transactions with ephemeral, re-randomized keys, while the SNARK links them using symmetric primitives that are quantum-resilient. This means we can swap the SNARK at any time as quantum nears. User funds remain safely spendable throughout.
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Sean Bowe retweetledi
Sean Bowe retweetledi
@matthew_d_green @davidzmorris @hdevalence @coincenter @EFF @TheFIREorg That's great, pretty good example of what I'm talking about though. EFF can do these safer, broadly applicable things while others fight on what I would consider the Frontier.
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@ebfull @davidzmorris @hdevalence @coincenter @EFF @TheFIREorg The EFF stepped in when the Treasury took the Tornado github repos down.
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Congrats to @coincenter on picking up the torch of protecting software freedom.
It’s unfortunate that the EFF seems to have abandoned their original mission but I am glad that someone is carrying it forward.
Peter Van Valkenburgh@valkenburgh
Coin Center’s Seven Takeaways from the Storm Verdict: ▪️ 1. The sole conviction—unlicensed money transmission (18 U.S.C. § 1960)—turns mainly on legal/regulatory interpretation (“does this count as money transmission?”), not jury fact-finding. ▪️ 2. The court, at the motion-to-dismiss stage, discounted FinCEN’s stated guidance on what counts as “money transmission” in crypto and treated the category as broader than “control of customer funds.” ▪️ 3. With “money transmission” defined that broadly, the jury’s room to decide facts was narrow; the court’s interpretation largely dictated the outcome. ▪️ 4. DOJ’s prior “end regulation by prosecution” memo didn’t fully resolve §1960 issues left things open for continued prosecution; the DOJ dropped the failure-to-register theory but not the “knowingly transmitting criminal funds” theory. Coin Center’s view: both hinge on “transmitting” and are improper against developers excluded by FinCEN guidance. ▪️ 5. The BRCA (Blockchain Regulatory Certainty Act), now attached to CLARITY and passed by the House, would confirm that non-controlling developers aren’t money transmitters. It can’t help Roman retroactively, but the Senate should pass it in upcoming market-structure debates. ▪️ 6. Coin Center fellow Michael Lewellen is suing DOJ for a declaration that publishing/maintaining his software isn’t unlicensed money transmission. Coin Center will continue supporting this effort to correct the legal interpretation. ▪️ 7. Coin Center is sorry Roman faces sentencing on a theory that contradicts the regulator’s guidance. He should appeal the denial of his motion to dismiss; Coin Center will assist however possible.
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