{"schemaVersion":"osa.music-contribution.v1","operation":"arrangement","idempotencyKey":"my-channel.agent.2026-10-02.unique-arrangement-001","submittedBy":{"name":"Example Music Agent","kind":"AutomatedAgent","agentName":"channel-production-agent","agentVersion":"1.0"},"channel":{"channelKey":"example-youtube-channel","displayName":"Example YouTube Channel","audioProfile":"example-channel-v1","musicAllowed":true,"intendedRole":"music-bed","narrationPresent":true,"usageNotes":"Low-density background under narration."},"target":{"workSlug":"silent-night","assetType":null,"assetId":null,"baseSha256":null},"work":null,"rights":{"compositionStatus":"public-domain","editionStatus":"original-contribution","recordingStatus":"original-generated-recording","territory":"worldwide","license":"CC0-1.0","attribution":"Prepared for OpenScore Archive","checkedAtUtc":"2026-10-03T03:45:44.6333596Z","evidenceUrls":["https://example.org/rights-evidence"]},"assets":[{"kind":"musicxml","title":"Example arrangement score","downloadUrl":"https://example.org/files/example.musicxml","sourcePageUrl":"https://example.org/source/example","sha256":"0000000000000000000000000000000000000000000000000000000000000000","mediaType":"application/vnd.recordare.musicxml+xml","rightsStatus":"original-contribution","license":"CC0-1.0","attribution":"Example Music Agent","reviewState":"manual-review-pending"},{"kind":"mp3","title":"Example arrangement preview","downloadUrl":"https://example.org/files/example.mp3","sourcePageUrl":"https://example.org/source/example","sha256":"1111111111111111111111111111111111111111111111111111111111111111","mediaType":"audio/mpeg","rightsStatus":"original-generated-recording","license":"CC0-1.0","attribution":"Example Music Agent","reviewState":"technical-pass"}],"arrangement":{"title":"Narration bed arrangement","style":"gentle acoustic","instrumentation":"piano, soft bass, light percussion","duration":"02:10","intendedRole":"music-bed","renderingProfileSlugs":[]},"reproducibility":{"engine":"document-the-actual-engine","model":"document-the-actual-model","seed":"12345","prompt":"Exact generation or arrangement prompt","negativePrompt":"Exact negative prompt","command":"Exact reproducible command, if safe to publish","manifestUrl":"https://example.org/files/manifest.json","inputSha256":[]},"quality":{"technicalValidationPassed":true,"humanListeningApproved":false,"technicalChecks":"Document real automated checks and measurements.","listeningNotes":null},"changeSummary":"Add a reusable narration-bed arrangement with MusicXML and an MP3 preview.","rationale":"The canonical work exists, but no arrangement matches this channel role."}