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 26th, but was only recently reported by the community. A million tokens worth approximately $1.3 million were purchased on June 5. Another one million tokens worth approximately $730,000 were also sold. TransferredYou can listen to Vitalik Buterin speak on Optimism at 12.26 AM UTC. The tokens that remain are still dormant can be purchased at any moment or used to change governance decisions.