{"schema_version":"secwatch.filing_event.v1","accession":"0000950170-25-089983","form_type":"8-K","ticker":"GBTC","cik":"0001588489","company_name":"Grayscale Bitcoin Trust ETF","filed_at":"2025-06-25T23:59:59+00:00","discovered_at":"2026-05-14T18:02:48.912784+00:00","generated_at":"2026-05-18T19:22:30.730903+00:00","sec_items":["8.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.2,"calibrated_materiality_score":0.2,"confidence":"high","headline":"Grayscale Bitcoin Trust adds Bitfinex to CoinDesk Bitcoin Price Index","bullets":["CoinDesk Indices added Bitfinex to the XBX index effective June 22, 2025.","No trading platforms were removed in the scheduled quarterly review.","Constituent platforms now: Coinbase, Kraken, Bitstamp, Crypto.com, LMAX Digital, Bullish, Bitfinex.","Index Provider may change venues or calculation method at any time."],"urls":{"canonical":"https://secwatch.observer/filing/0000950170-25-089983","json":"https://secwatch.observer/filing/0000950170-25-089983.json","markdown":"https://secwatch.observer/filing/0000950170-25-089983.md","text":"https://secwatch.observer/filing/0000950170-25-089983.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1588489/000095017025089983/0000950170-25-089983-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1588489/000095017025089983/gbtc-20250622.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-18T19:22:30.730903+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"}