There are two types of Bluwhale nodes in order to decentralize the AI network. Master Nodes: Limited availability to 100,000 and limited timeframe to purchase from September 30th 10AM UTC until December 23rd 11PM UTC Common Nodes: Infinite availability and no limitation to quantity or timeframe for purchase starting December 1st, 10AM UTC The main difference between those two nodes is that Master nodes can create a community of people running nodes together and boosting the groups rewards, while Common nodes have only 1/10th the emissions, a lower price tag and no boosting or community capabilities.