Cross-Brain Quorum for Generative Hallucination Detection with Divergence-Triggered Refusal.

N independent brains must agree within a per-domain semantic-distance threshold or no artefact is signed.

A method and system for detecting hallucinations at the moment of generation by dispatching the same prompt to N independent generative brains on operator-controlled silicon and refusing to sign an artefact unless the brains agree within a per-domain semantic-distance threshold. A consensus aggregator computes a pairwise semantic-distance matrix under a domain-appropriate metric (BLEU and BERTScore for text, CLIP for imagery, AudioCLIP for audio, AST edit distance for code, structural similarity for video) and a threshold evaluator gates the signing. Above threshold, no artefact is signed and an unsigned diagnostic record describing the divergence is logged into a wider operator audit chain. The arrangement catches hallucination at generation time, before any output reaches a downstream consumer. Filed 21 May 2026 as GB2611915.6.