California's campaign watchdog arm says political donations can't be made with cryptocurrency such as bitcoin.
The Fair Political Practices Commission voted 3-1 Thursday to ban such donations.
The origin of cryptocurrency may be hard to track and raise questions about transparency.
The Federal Elections Commission allows bitcoin donations to federal candidates.
Multiple other states have grappled with the same issue. South Carolina has similarly banned such contributions while states like Colorado and Montana allow them with restrictions.
Copyright AP - Associated Press