PANews reported on February 13 that Ethereum co-founder Vitalik Buterin wrote: "The Railgun privacy pool mechanism allows Railgun to avoid handling criminal proceeds without any monitoring or backdoors. It works as follows: 1. Anyone can make a deposit to Railgun; 2. After the deposit, there will be a 1-hour detection period, during which various algorithms will analyze whether the deposit may come from criminal activities they have determined; 3. If the deposit passes the screening, the user can use ZKP to withdraw privately after 1 hour (but it is recommended to wait longer to obtain a sufficient anonymity set); 4. If the deposit fails the screening, the user can only withdraw the funds back to his or her own address. Doing so will not result in the funds being frozen or confiscated, but the anonymity function of the privacy pool will not be enjoyed. If someone disagrees with Railgun's screening rules, they are free to fork and create their own privacy pool, but if they do not gain broad enough public support, their anonymity will be very limited."