Como falei no fórum gringo, onde vi tb essa discussão, a coisa mais próxima de reversão de transações foi o hardfork do ethereum quando roubaram os fundos da DAO.
foi a primeira ICO de sucesso e tinha um bug em um smartcontract da ico permitiu que hackers roubassem 70 milhões de dólares em eth.
A comunidade acabou resolvendo fazer um fork na rede de tal forma que quem investiu na rede fosse ressarcido em eth. Uma parte pequena da rede rejeitou a ideia, o que gerou o Ethereum Classic (etc).
Quote
https://www.cryptocompare.com/coins/guides/the-dao-the-hack-the-soft-fork-and-the-hard-fork/
This hard fork had the sole function of returning all the Ether taken from the DAO to a refund smart contract. The new contract would have only one function: withdraw. The DAO token holders could request to be sent 1 ETH for every 100 DAO. The investors that had paid more than 1 ETH for 100 DAO could request the difference from the original address. This proposal generated a lot of controversy among the Ethereum community, which was split into 2 groups: hard fork supporters and non-supporters.[]/quote]
This hard fork had the sole function of returning all the Ether taken from the DAO to a refund smart contract. The new contract would have only one function: withdraw. The DAO token holders could request to be sent 1 ETH for every 100 DAO. The investors that had paid more than 1 ETH for 100 DAO could request the difference from the original address. This proposal generated a lot of controversy among the Ethereum community, which was split into 2 groups: hard fork supporters and non-supporters.[]/quote]
