Review Sign Airdrop: Opportunities, Lessons, and Future Improvements Recently, there has been a sign on a certain security account, and another project has been traced back to that account. The following is a review of the entire process, summarizing profits, arbitrage opportunities, pitfalls encountered, and experiences gained from sharing with other users in the member group chat, providing reference for future airdrops and arbitrage. 1、 Operation and benefits of Sign airdrop According to the official task list of Sign, simple interaction: