Sentigraph is a system that provides predictive insights aimed at improving future events based on emotion data obtained by analyzing users’ reactions to a given event leveraging artificial intelligence (from IBM Watson), blockchain and Interplanetary File System (IPFS - p2p). A suitable use case is analyzing twitter hashtags using IBM Watson and an algorithm to compute the graph index, gi. The gi is an index that signifies the strength or pulse of the users' reactions (subscribers) in a given network, which also invariably determines the sustainability of that event or initiative. The gi informs the organization or individual about the viability of their events (represented by a hashtag). The system can analyze equity markets, various review systems, social media, politics, healthcare, and national security via related twitter hashtags.