Zano rolls blockchain back a month after Gateway Address exploit
The Zano blockchain has been restarted at the block height that came immediately before Hard Fork 6, which introduced Gateway Addresses.
Asanat Analysis — Why it matters
Zano's decision to revert approximately one month of chain history signals a severe vulnerability in Gateway Addresses—a feature significant enough to warrant nuclear-option recovery rather than targeted patching. This approach eliminates all transactions and state changes since Hard Fork 6, effectively wiping user balances, pending transactions, and smart contract executions. While full rollbacks are rare in mature blockchains, they remain the pragmatic choice when exploits threaten core consensus or custodial integrity.
The incident underscores persistent execution risks in privacy-focused Layer 1s, where complex cryptographic features (Gateway Addresses likely enabling privacy functionality) introduce attack surface. For Zano's ecosystem—which relies on user trust to compete with Monero and Zcash—this represents both immediate user attrition and longer-term questions about code audit rigor. The timing (post-fork deployment) suggests inadequate pre-release testing, a recurring pattern in lower-cap blockchain projects managing security with limited resources.
Precedent matters here: similar rollbacks (Ethereum DAO fork, BSC halts) typically precede months of community recovery and protocol skepticism. Zano's recovery hinges on transparent communication about the exploit's specifics and remediation measures—details likely absent from initial public statements. Competitors will scrutinize whether this reflects isolated QA failure or systemic development practices.