The Palimpsest is a subdermal data storage and encryption implant woven into the hypodermis across the upper back and shoulders, forming an invisible grid of bio-compatible polymer filaments embedded with crystalline memory nodes. Data is written to the lattice via a proprietary near-field induction handshake and is stored in distributed shards across the filament network, meaning no single point of extraction yields a readable payload. The system encrypts on write using a biometric key derived from the host's unique galvanic skin response signature — rendering data literally unreadable if removed from the living body.