[Ethereum researchers launch "time machine" to allow cryptocurrency users to restore Ethereum transactions] Golden Finance reported that Vlad Zamfir, an Ethereum researcher and co-founder of Smart Transactions (STXN), created a "time machine" that allows Ethereum users to reverse "smart transactions" on the blockchain, which makes certain transactions less immutable. Smart transactions also allow users to set specific conditions for transaction time and execution. Similar to how Gmail allows users to cancel sending emails, this feature will be supported on blockchains compatible with the Ethereum Virtual Machine.