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First, let's define a _message layer_. Here we have a concept of an _actor reference_.

An actor reference has:

1. An inbox.
2. A URI id that just returns this reference object.
3. A structured type field, indicating what class of messages it takes and some basic behaviors around it. This can be simple or relatively complex

These are functionally immutable references. A _user_ is a distinct concept and may change actors around at any point. They can also refer to a central actor via DNS

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