The Zano blockchain has been restarted at the block height that came immediately before Hard Fork 6, which introduced Gateway Addresses.
Source: [CoinTelegraph](https://cointelegraph.com/news/zano-rolls-blockchain-back-a-month-after-gateway-address-exploit?utm_source=rss_feed&utm_medium=rss&utm_campaign=rss_partner_inbound)