self sovereign identity

Definition

Self-Sovereign Identity (SSI) is a term that has many different interpretations, and that we use to refer to concepts/ideas, architectures, processes and technologies that aim to support (autonomous) parties as they negotiate and execute electronic transactions with one another.
Paraphrased by @henkvancann, sources eSSIF-lab and ToIP.

The definition started in the blog "The Path to Self-Sovereign Identity" by Christopher Allen in 2016. has not resulted in a consensus today. While some see the ten principles of SSI that Allen proposed as the definition of SSI, he formulated them as "a departure point to provoke a discussion about what's truly important". And it is obvious that what is important differs per party.
Source eSSIF-lab