An incident that just happened to my classmate this afternoon may result in a loss of 200000 u, which is quite distressing. I would like to write it down to remind everyone that on chain transfers must be confirmed repeatedly My classmate is doing foreign trade business in Guangdong. Around 6pm this afternoon, his subordinate transferred USDT to a client who is Russian. The original plan was to transfer 222000+USDT, but the person who transferred the money entered an extra digit and transferred 222000+. Transferred an additional 200000 USDT plus a small amount. I'm very anxious. Then I looked at the funding chain with @ Nazarick-eth 1. Money flows from Binance to the other party's address, using the wavefield of @ Justinsuntron (the wavefield coverage is really wide) 2. The other party may have been confused at the time, thinking that it was a windfall from heaven. 17 minutes later, they transferred the money into Bybit, creating a sense of wanting to quickly transfer the money away Then my classmate contacted Binance customer service, and their response was: 1) The money has already been deposited into Bybit, you can contact Bybit customer service to freeze the receiving account or refund it; 2) Call the police. I would also like to ask the @ benbybit boss and Bybit teacher if they can cooperate and see if the funds are still with Bybit, and if they can assist in communication. My opinion is: 1. Prioritize communicating with the Russians, from a business perspective, how deeply the business interests of both sides are tied, how big the other side's situation is, and whether it is possible to negotiate a partial refund (even if it is partial); If it can be returned, what kind of discounts can be given in the future business to achieve long-term win-win results. But this is too testing of human nature, they are still communicating with each other. If the case is reported and the money is still on Bybit, it's okay. It may be possible to cooperate with communication to freeze the funds (my classmate can provide contracts and other documents); But if the money has already been transferred through Bybit (as a bridge) to another self managed wallet, it will be even more troublesome. It has been quite difficult to do foreign trade in the past two years, and I feel sorry for my classmates. In fact, in most companies, traditional bank transfers require approval from the cashier and at least two meetings. He did not intervene in the review process because he was not very familiar with Crypto. This lesson is a bit expensive. It is also suggested that @ Christianeth @ 0xshawnpang, the two bosses of B2B financial SaaS products, can optimize similar processes more to prevent business colleagues from making low-level mistakes and causing huge losses. To optimize the payment process, @ Nazarickputting forward a good suggestion, you can set up two Binance accounts, A for receiving payments (depositing large amounts of funds), managed by my classmate (boss); When external payment is required, transfer it to account B before making external payment. B account usually does not deposit money, and can only keep a small handling fee in the account at most. When withdrawing/transferring funds within the exchange app or on the chain, it is important to verify the other party's wallet address UID、 Don't learn this expensive lesson from information such as amount, blockchain affiliation, etc!