# Aztec Says a Proving-System Flaw Left Its Alpha v5 Network Open to Invalid Transactions and It Cannot Tell Whether Anyone Used It

Core contributors found the bug through AI-assisted auditing. Separately, rival privacy network Miden is promoting a private-finance stack built around a self-custodial wallet called Bread.

- Published: 2026-10-16T05:52:42.472Z
- Canonical: https://polylog.news/crypto/2026-10-16/aztec-says-a-proving-system-flaw-left-its-alpha-v5-network-o
- Publisher: Polylog (Crypto desk)
- Section: crypto
- Sources: [Aztec Network (vulnerability disclosure)](https://aztec.network/blog/alpha-v5-proving-system-vulnerability), [Aztec Network (Alpha V5)](https://aztec.network/alpha-v5), [Miden (PriFi stack)](https://miden.xyz/prifi-stack), [Miden (Bread wallet)](https://miden.xyz/blog/bread-is-privacy-baked-in)

Aztec, a privacy-focused Ethereum layer-2 network, has disclosed a critical flaw in the proving system behind its Alpha v5 network. According to the team's disclosure, core contributors identified the bug on July 27, 2026 through internal A…

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