It honeymoon period for the Optimism layer-2 scaling solution has been cut short, as an exploit in its market maker’s smart contract led to the loss of 20 million OP tokens.

The exploitThe event took place on May 26, and was only recently reported to the community. A total of one million tokens, valued at approximately $1.3million were sold Sunday. Additional 1,000,000 tokens worth approximately $730,000 were also sold on Sunday. Transferred to Vitalik Buterin’s address on Optimism earlier today at 12:26 am UTC. For now, the tokens remain dormant but can be sold or used in any way to influence governance decisions.