secwatch.observer — SEC 8-K summary
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Issuer:     Grayscale Bitcoin Trust ETF (GBTC)
CIK:        0001588489
Form:       8-K
Filed at:   2025-08-08T23:59:59+00:00
Accession:  0000950170-25-105826
Event type: other_material
Sentiment:  neutral
Materiality: 0.45
Item codes: 1.01, 9.01
LLM model:  deepseek-v4-flash:cloud@v2

Grayscale Bitcoin Trust adds Anchorage Digital as secondary Bitcoin custodian
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- Entered custodial agreement with Anchorage Digital Bank N.A. on Aug 8, 2025 for Bitcoin custody.
- Anchorage will store Bitcoin private keys in cold storage; Coinbase remains primary custodian.
- Sponsor has not yet determined amount of Bitcoin to move to Anchorage.
- Agreement also covers Grayscale Ethereum Trust ETF as additional client.
- Anchorage is a national trust bank chartered by OCC; agreement includes indemnification and insurance.

Source:
  EDGAR index:    https://www.sec.gov/Archives/edgar/data/1588489/000095017025105826/0000950170-25-105826-index.htm
  Primary doc:    https://www.sec.gov/Archives/edgar/data/1588489/000095017025105826/gbtc-20250808.htm
  HTML page:      https://secwatch.observer/filing/0000950170-25-105826

License: Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer