I also have not a good English teacher . The English is a tool like C and Java :-D
with the coin's world everybody can run own node, possible easy when runs own wallet. De-centralized exchange must have all required functions for running all services. Every body must have own database for the transactions history, also can make own web site for tx-explorer, deals, offers. Any body can make own website for non-anonymous deals with anonymous users, same as current exchanges. But this is possible only with multisignatures coins. Or if a coin have not multisign. parts of the priv-key must be shared between few nodes, other part must be exchanged between diff. nnodes
my wallet and all my services have its own multisign library. i have found the confirmation bugg on m< decentralized exchange thaats meaning in the next release is my exchange complete done