Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2022	Aug. 25, 2022	Dec. 31, 2021
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Document Period End Date	Jun. 30, 2022
Document Annual Report	true
Document Transition Report	false
Current Fiscal Year End Date	--06-30
Entity Registrant Name	Grayscale® Bitcoin Cash Trust (BCH)
Entity Central Index Key	0001732409
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		34,812,900
Entity Public Float			$ 98,095,827
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity File Number	000-56308
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-6867376
Entity Address, Address Line One	290 Harbor Drive, 4th Floor
City Area Code	212
Local Phone Number	668-1427
Entity Address, City or Town	Stamford
Entity Address, Postal Zip Code	06902
Entity Address, State or Province	CT
Title of 12(g) Security	Grayscale Bitcoin Cash Trust (BCH) Shares
Trading Symbol	BCHG
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
ICFR Auditor Attestation Flag	false
Documents Incorporated by Reference	None
Auditor Name	Friedman LLP
Auditor Location	East Hanover, New Jersey
Auditor Firm ID	711