[Specter: A MetaMask Swap routing contract has been blacklisted by Tether for nearly 5 years] Blockchain security researcher Specter stated in a post that during the investigation of the Payy Network attack incident, it was discovered that an address of a MetaMask Swap routing contract had been blacklisted by Tether in 2021 and has remained on the blacklist ever since. Specter noted that he had not previously been aware of this situation.