ZecZcashZcash has reached another milestone in formally verified cryptography.
Project Tachyon announced that, thanks to work by Marius Margulis, the new zk-SNARK prover in Zakura — also used by Vizor Wallet — is the first Zcash prover with a machine-checked Lean proof of statistical honest-verifier zero-knowledge (SHVZK).
In simple terms, a key zero-knowledge property of the prover has now been formally proven and checked using Lean, a theorem-proving system designed to verify mathematical proofs.
This is an important distinction: the announcement does not mean that the entire Zakura implementation has been formally verified. The new proof specifically covers the prover's statistical honest-verifier zero-knowledge property.
The milestone follows Project Tachyon's formal verification work on Ironwood, where machine-checked Lean proofs for supply soundness were published in July.
Together, these developments highlight a growing emphasis within the Zcash ecosystem on using formal methods to strengthen the foundations of its privacy technology.
For Zcash, privacy isn't just about implementation — increasingly, it's about proving the mathematics behind it.
📅 September 13, 2026
🔗 Source: Project Tachyon
https://x.com/TachyonZcash/status/2098570191731081647
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