The Veintree FPGA Dongle is a compact, USB-powered device enabling secure, offline authorship and authentication through real-time biocryptography—not biometrics. Using an embedded Intel Altera Agilex 5 FPGA and a custom infrared multispectral array, it transforms the unique vein patterns of both hands into ephemeral cryptographic keys, with no biometric storage or traceability. All processing runs fully on-chip, ensuring deterministic, offline operation with post-quantum resistance by design. The dongle invisibly embeds authorship data into video or documents at capture, then anchors this signature to the Polkadot blockchain for decentralized proof of personhood, liveness, and timestamped authorship. It integrates seamlessly into creative, legal, and healthcare workflows, replacing traditional 2FA and KYC with a Zero-Knowledge, hardware-rooted method. Lightweight, energy-efficient, and privacy-preserving, it empowers creators and users with sovereign digital trust—without compromising control.