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[Bubblemaps: MEGA Token Presale Hit by Sybil Attack] Bubblemaps revealed that the MEGA token presale of MegaETH encountered a Sybil attack. According to the presale rules, each user is limited to using one wallet, with a maximum bid amount of $186,000, and identity verification must be completed through the Echo platform. However, Bubblemaps discovered that approximately 20 entities used multiple linked wallets to bypass the limit. Among them, wallet address 0x9f5c received funds from Kraken a day earlier, which were then distributed to three new wallets. Four addresses collectively placed bids totaling $600,000, exceeding the allowed allocation limit by three times.