Dan Held

Follow me to learn about Bitcoin. Fractional CMO. Prev: Head of Marketing @Krakenfx | Growth @Uber @Blockchain. Founder Zeroblock/Interchange (both acq)

[Dan Held @danheld]

@Tan_MSJ @zectrillionaire Intellectually dishonest to compare the two, and the fact you are shows both your ignorance and slant

[Dan Held @danheld]

@ZubyMusic Good man

[Dan Held @danheld]

HODL ✊

[Dan Held @danheld]

@PeterSchiff

[Dan Held @danheld]

@JamesSurowiecki Ok boomer!

[Dan Held @danheld]

@bitcoinbutcher1 @robmaurer @closenberger Retarded. Equivalent to buying litecoin.

[Dan Held @danheld]

@PakoVM @QwQiao I’ve explored this topic extensively and wrote up my findings 6 years ago.

https://t.co/uEx98Kq86g

[Dan Held @danheld]

@michaellebowitz Ok boomer!

[Dan Held @danheld]

@JonBbC_TechGeek Ok boomer!

[Dan Held @danheld]

@PakoVM @QwQiao Huh? Known that for years. Privacy level isn’t the same as zk or other tech

[Dan Held @danheld]

@PakoVM @QwQiao Nope, not on the base layer

[Dan Held @danheld]

@bryce You’ll look back on this obviously false statement with a embarrassment

[Rob Maurer @robmaurer]

Remember a couple weeks ago when everyone was saying a 100x price/sales was crazy for SpaceX and all of a sudden it’s like 39x? Shows how dumb that type of analysis is 😅

[Dan Held @danheld]

@robustus @udiWertheimer You did Dan, but very few others did

[Charles Guillemet @P3b7_]

👉For 4 years, 1 day, and 10 hours, anyone who understood the Orchard circuit could have minted ZEC out of thin air, silently, with no on-chain signature. The bug was disclosed this week. It was found by an AI-driven audit running Opus 4.8, not by an attacker.

1. Call the bug what it is
Two lines in halo2's variable-base scalar multiplication gadget used assign_advice() where copy_advice() was required. As a result, the diversified-address integrity check pk_d = [ivk]·g_d could be satisfied for arbitrary inputs. A malicious prover could spend the same note multiple times with different nullifiers, i.e. counterfeit ZEC inside the Orchard pool, undetectable on-chain because the privacy of the ZK proof hides exactly the inputs that would reveal the attack.

We do not know whether it was exploited. We will probably never know.

2. Four years. Multiple audits. Top-tier reviewers.
Orchard was reviewed by some of the strongest cryptographers in the field before activation. They missed it. Earlier automated audits with Opus 4.7 missed it. Opus 4.8 catches it in roughly 1 in 4 runs when prompted generically. The bug is hard.

And ZK inflation bugs are not new. Zcash itself shipped a counterfeiting vulnerability in Sprout (BCTV14) that survived years before being silently neutralized during Sapling. Similar soundness issues have appeared in circom, halo2, and rollup verifiers since. The pattern is consistent: when the protocol is private, exploitation is undetectable. You patch the bug and hope.

3. What Zcash did right
This was a textbook decentralized incident response:

▶️Audit: a full AI-assisted soundness audit of halo2 + Orchard, scoped end-to-end.
▶️Discover: the agent flagged the missing constraint and worked out the algebra to turn it into an exploit. A working RPC-level PoC in ~6 hours, mostly waiting on tokens.
▶️Coordinate: a soft fork disabling Orchard, prepared and distributed without leaking the bug, activated 2 days and 15 hours after acknowledgement. Coordinating a soft fork across miners, exchanges, and nodes without disclosing why is genuinely hard. They did it.
▶️Disclose: timeline, code lines, math, open questions. No spin.
Worth naming explicitly: Zcash's turnstile invariant caps the value that can ever leave a shielded pool by the value that entered it. Privacy and verifiability inside the same protocol. That is not an accident. That is good engineering, and it is what kept the worst case bounded.

4. The economics of security just changed
AI does not change whether bugs like this exist. It changes the cost of finding them. I wrote about this https://t.co/AeurraJXhB: a missing constraint in a 4-year-old production ZK circuit used to require a top-tier cryptographer with months of context. It now requires a few tokens, an API key, and a well-framed prompt.

The defender benefits. The attacker benefits more, they only need to find it once, and they never disclose.

Orchard is the optimistic version of this story: defense got there first. The pessimistic version is the one we cannot rule out, because the chain is private by design.

5. The only real exit
You do not patch your way out of this asymmetry. You raise the floor.

Formal verification of consensus-critical circuits, every assign_advice audited by SAT solvers and AI for under-constraint, as the reporter himself recommends. Proof-grade engineering that used to be too expensive is now cheap enough to be mandatory.
Hardware roots of trust, secure enclaves, certified secure elements, WYSIWYS. Cryptographic guarantees the user can actually verify, not promises a host can lie about.
Continuous AI-assisted audit of every consensus-critical commit, re-run immediately on the release of any new frontier model.
Zcash didn't just patch a bug. They demonstrated the new defensive playbook: AI-driven audits, decentralized coordination, radical transparency, verifiable invariants. That is the direction the rest of the industry needs to follow.

And those who don't raise the bar for security will be rekt in this new world.

Stay safe. Stay honest about your trust assumptions.

[Dan Held @danheld]

@udiWertheimer @EthosVentures Not surprising at all that the shillers didn’t adequate disclose the risk

[Dan Held @danheld]

@CoinDesk @CryptoHayes Duh.

[Dan Held @danheld]

@haralabob 💯👌