{"schema_version":"secwatch.filing_event.v1","accession":"0000950170-24-119507","form_type":"8-K","ticker":"GBTC","cik":"0001588489","company_name":"Grayscale Bitcoin Trust ETF","filed_at":"2024-10-31T23:59:59+00:00","discovered_at":"2026-05-14T18:03:08.890966+00:00","generated_at":"2026-05-30T07:26:17.974953+00:00","sec_items":["8.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Grayscale Bitcoin Trust adds Bullish to its index pricing constituents, effective Oct 27","bullets":["CoinDesk Bitcoin Price Index (XBX) added Bullish as a constituent trading platform as of Oct 27, 2024.","No platforms were removed; the index now includes Coinbase, Kraken, Bitstamp, Crypto.com, LMAX Digital, and Bullish.","The change may affect the calculation of the Index Price used for the Trust's net asset value.","The Index Provider can adjust venues at any time and conducts scheduled quarterly reviews."],"urls":{"canonical":"https://secwatch.observer/filing/0000950170-24-119507","json":"https://secwatch.observer/filing/0000950170-24-119507.json","markdown":"https://secwatch.observer/filing/0000950170-24-119507.md","text":"https://secwatch.observer/filing/0000950170-24-119507.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1588489/000095017024119507/0000950170-24-119507-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1588489/000095017024119507/gbtc-20241027.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-30T07:26:17.974953+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}