DIDComm
The messaging protocol for DID-identified agents — JSON-LD over HTTP / WebSocket / Bluetooth, end-to-end encrypted between DID-controlled keys, supporting both routing through mediators and direct connections. Maintained by the DIDComm Working Group at the Decentralized Identity Foundation. The transport substrate of Hyperledger Aries and several emerging LLM-agent interop standards; conceptually parallel to A2A and ANP.