ChainCatcher news, according to Cointelegraph, Ethereum researcher and co-founder of Smart Transactions (STXN) Vlad Zamfir has created a "time machine" that allows Ethereum users to reverse "smart transactions" on the blockchain, making certain transactions less immutable.STXN co-founder Anuj Das Gupta stated that Smart Transactions also allow users to set specific conditions for the timing and execution of transactions. This feature will be supported on blockchains compatible with the Ethereum Virtual Machine (EVM), which will be very useful for the thousands of crypto users who have made transactions on-chain due to operational errors. Das Gupta said, "Ethereum smart contracts are no longer limited to what was known at the time of writing. We believe this is an important solution to the tension between flexibility and immutability in blockchain."