The Optimism Mainnet network will be undergoing an upgrade expected to start on or around 10am - 3pm PST on November 11th, 2021.
This is part of the Optimism regenesis (OVM 2.0) and will there are a few important changes to note:
❌ Unverified contracts will be wiped out
❌ ETH will no longer be ERC20 compatible
❌ EOAs will no longer be contract wallets
Link to the Optimism Discord: http://discord.com/invite/jrnFEvq
During this time, the Alchemy Optimism API will also experience downtime.