Public corpus

Every file a verdict rests on. Soundcheck 001: Suno v6-mini and ElevenLabs Music v1 / v2, bought as customers, tested September 24, 2026. Run any of it yourself, for example: curl -X POST https://studio-api.prod.suno.com/api/c2pa/detect -F "file=@original.mp3"

Suno v6-mini - files

Original and attacked copiesuntouched purchase, $4.99, no special access

original.mp3 untouched purchase - audio stream SHA256 082dd25a... remux.mp3 container re-save, audio bit-identical stripped.mp3 metadata stripped, audio bit-identical reencode.mp3 decode + MP3 192k re-encode loudnorm.mp3 loudness normalization converted.m4a AAC format conversion tempo105.mp3 +5% tempo control_sine.mp3 non-Suno control, 440 Hz sine

Suno v6-mini - vendor detector, verbatim

Raw responsesone per file, unedited

resp_original.mp3.json verified_suno, contentId matches the public song page resp_remux.mp3.json no_suno_provenance resp_stripped.mp3.json no_suno_provenance resp_reencode.mp3.json no_suno_provenance resp_loudnorm.mp3.json no_suno_provenance resp_converted.m4a.json no_suno_provenance resp_tempo105.mp3.json no_suno_provenance resp_control_sine.mp3.json no_suno_provenance

Measurements

Probes and summaries

resp_original_decoded.wav.json boundary probe: lossless PCM of the same audio - no_suno_provenance resp_original.flac.json boundary probe: lossless FLAC, same decoded audio - no_suno_provenance resp_reencode320.mp3.json boundary probe: MP3 320k re-encode - no_suno_provenance boundary_probe_20260924.json probe method + Suno's 6 Aug watermarking statement proof_battery_20260924.json battery summary: hashes + responses manifest_reference_impl.json C2PA reference-implementation read of the untouched file audit_ms_a_music30_seed42.json watermark battery, clip A - fragility 0.7024 audit_ms_b_clipb_seed1337.json watermark battery, clip B - fragility 0.7979 audit_ms_c_clipc_seed9001.json watermark battery, clip C - fragility 0.6962

ElevenLabs Music v1 / v2

Results and detector readsSoundcheck 001, UI and API paths

el002_results_20260924.json full result record: provenance checks, watermark reads, unique IDs, timestamps

Watermark reads land as the public detector's daily cap allows (25 still in progress). The 20-track audio set and 39-variant attack copies publish with the completed read column.

Detection check

Open-detector scoresSONICS SpecTTTra, authors' published models, run locally Sep 24 2026

detection_round_spectttra_alpha120s_20260924.jsonl per-file fake probabilities, 120s model, originals + all attacked variants + human control detection_round_spectttra_alpha5s_20260924.jsonl same corpus, 5s model, per-chunk vote silentcipher_reference_round_20260924.json SilentCipher reference round: 20 attack files, per-file chunk recovery and verdicts