Zano rolls back blockchain by a month after Gateway exploit

Zano rolled back approximately a month of blockchain history after a Gateway Addresses vulnerability allowed unauthorized ZANO and Freedom Dollar into circulation. The chain restarted at block 3,833,000. The restart point came immediately before Hard Fork 6. Hard Fork 6 introduced Gateway Addresses. Participating nodes, miners, stakers, exchanges and other services must adopt the update, according to Zano's core team. The rollback invalidated legitimate transactions from the affected period. Transactions from that period may need to be reconciled. The rollback cannot reverse payments already settled on other blockchains. Zano said it is working to account for losses. Zano will publish a reimbursement and claims process. Zano had not released a post-mortem at the time of publication. Gateway Addresses were developed to help bridges, exchanges and payment services integrate with Zano. The feature lets those services manage funds through a single account-style balance. Zano launched in May 2019 as a layer-1 blockchain focused on private payments. Freedom Dollar, or fUSD, is a custom token that operates on the Zano blockchain. Zano head of marketing and growth Quinten van Welzen said the rollback restores the expected supply. Van Welzen said the rollback costs a month of history and trust. He said Zano had worked for 7 years to build the project.