Summary
This protocol allows agents to exchange DIDs during the setup of a connection. Typically used during the use of the Out of Band protocol
This protocol is defined here: https://github.com/hyperledger/aries-rfcs/tree/bf3d796cc33ce78ed7cde7f5422b10719a68be21/features/0023-did-exchange
Note: as pointed in the abovementioned link, the version of this protocol is 1.0 and was defined initially in Hyperledger Aries using DIDComm v1 headers/decorators. Readers should be aware that this protocol isn't necessary for DIDComm V2.