Sovereign Real-Time Streaming AudioSeal for Live Voice Synthesis with Rolling-Window Signatures.

Per-buffer rolling-window signature chain verifiable within one buffer of arrival, latency under 50 ms.

A method and system for cryptographically authenticating a live synthetic voice stream at the granularity of successive audio buffers. At the producer, a psychoacoustic shaper embeds a latency-bound watermark into each buffer, and a signing engine computes a per-buffer signature whose payload binds the buffer hash, the prior buffer's signature, a hardware timestamp, and a speaker-identity attestation, signed under FIPS 204 ML-DSA-65. Each per-buffer signature is interleaved with the audio so a verifier confirms authenticity within one buffer of arrival and a downstream recorder can prove the recording is bit-identical to what was streamed in real time. The total signing budget remains under 50 milliseconds per buffer, preserving live-stream usability against deepfake voice-call attacks. Filed 21 May 2026 as GB2611925.5.