Continuity Envelope Protocol

This document defines the Continuity Envelope Protocol (CEP), a transport-agnostic protocol model for identity-bound messaging systems where delivery alone is not sufficient. CEP separates a visible envelope surface from sealed internal object truth and defines how receivers determine whether a delivered object may safely and legitimately continue. The protocol distinguishes between control-plane notification, data-plane object carriage, and decision-plane continuation handling. CEP is the umbrella model for companion drafts such as TIBET TAT, which specifies generic sealed handoff and transfer flow, and IDDrop, which profiles that handoff model for identity transfer.