The Ethereum Foundation issued a document saying that the parameters of the mainnet merger were reached in the community conference call, but TTD is based on the difficulty of proof of work, so it is difficult to estimate accurately. The target date is September 15, 2022, but this estimate even There may be a one week error. In the following core developer call on August 18th, final adjustments will be made to confirm TTD or make final adjustments to better meet the target date. In addition, important events include EL and CL teams cutting the mainnet software version on August 18; final parameters and released client resources on August 23; Bellatrix mainnet upgrade on September 6.