FTX-backed Serum has declared itself "defunct". Serum said its product, OpenBook, is currently live on Solana mainnet with over $1 million in daily volume. "Unfortunately, with OpenBook's existence, Serum's volume and liquidity has dropped to near-zero. Users and protocols are safe using an alternative fork such as OpenBook, after finding...security risks on the old Serum code," Serum tweeted.