This work is an overview of different approaches to the self-sovereign identity (SSI) concept. The idea of constructing of a digital passport for each and every person in the world is not unique, but with the growing interest and progress of distributed ledgers, a new way of dealing with existing problems appeared. On the other hand, in our point of view, a lot of development groups are working in parallel on the similar topics, yet it is not clear what is going on inside. In this paper we will try to define the differences and discuss both pros and cons of using such commonly known technologies as Sovrin based upon the Hyperledger Indy technology, Civic, Jolocom, uPort and some others. Besides, we’ll tackle the idea of using the SSI for inanimate object and how it can be constructed in this way.