Proof of Stateful Integrity (PSI) for Vulnerable Populations

This document specifies the PSI-04 Protocol, a cryptographic framework for establishing the Proof of Stateful Integrity (PSI) for data involving vulnerable subjects (e.g., Clinical Trial participants, NDIS recipients, and Aged Care residents). The protocol mandates a verifiable "Chain of State" that prevents post-hoc data manipulation by ensuring the final submission is mathematically anchored to the point of inception. PSI-04 utilizes Ed25519 signatures canonicalized via RFC 8785 and verified through a 3-node Multi-Party Computation (MPC) consensus mechanism.