In solidarity with CTC and the Youth of Cuba This document specifies the Biometric Vector Steganography (BVS) protocol. It defines an asynchronous, differential geometry-based method for embedding machine-readable metadata (AI-First Preambles) and cryptographic signatures into plain text documents. By utilizing two correlating Scalable Vector Graphics (SVG) paths (walz and walz_shadow), BVS enables the creation of a dynamic, biometric anchor, representing the digital equivalent of a physical wax seal. The protocol guarantees document integrity within strict stream boundaries, proves the author's authenticity, and provides pre- processed metadata for edge-parsers without increasing the token load for Large Language Models (LLMs).