Sovereign Code-Synthesis Audit Trail with Line-Level Lineage from Spoken Intent.

Per-line cryptographic lineage from operator utterance to AI-generated source code.

A method and system for producing per-line audit trails of source code generated by an AI code-synthesis pipeline, cryptographically bound to the originating spoken or written operator intent and to the intermediate reasoning trace. For every line, a lineage tuple is constructed comprising an intent hash derived from the captured operator utterance, a plan-step hash, a model identifier, a prompt hash, an operator-bound signing-key identifier, and a non-falsifiable timestamp, signed under ML-DSA-65 of FIPS 204. The signed tuples are emitted as git notes against the introducing commit and rendered in the operator's IDE as hover attribution; an export pipeline emits a regulator-grade SPDX-AI Software Bill of Materials suitable for submission under IEC 62304, DO-178C, ISO 26262, and IEC 60880. Filed 21 May 2026 as GB2611888.5.