Order – is a public announcement about the fact that user is ready to exchange cryptocurrency X for the cryptocurrency Y.
Orderbook – is the effective lists of orders used by users to find each other and exchange cryptocurrencies promptly.
On both centralized and semi-decentralized exchanges (e.g. IDEX) orderbook is stored on the basic server. Thus, the server owner is responsible for the matching between buyers and sellers, similarly to the owners of torrent-trackers.
So, the decentralized orderbook addresses the elimination of the administrator’s influence on the exchange processes and on online order matching.
We have solved this problem via the ipfs pubsub library means.