The official mainnet with new Seed nodes will start september 30. same day  will be available open source on github and downloads of wallet gui on swap site and then on official site

The new blockchain is premined with same number of current blockchain mined

Since we also suppose that at least 75milions DCY could be  lost for ever. so newer will be swapped the number of preminated new DCY will be 1,800 Billions DCY all availables for Swap. It mean that 200milions DCy will be availables for miners