British banks received 10,092 complaints about cryptocurrency transaction restrictions during a 90-day period, according to findings published by the advocacy group Stand With Crypto.
The complaints, submitted by approximately 9,800 individuals between May and August, covered customers across all 650 UK parliamentary constituencies.
Lloyds Banking Group received the largest number, with 2,297 complaints, followed by Barclays with 1,569 and NatWest with 1,278.
Restrictions ranged from transaction limits to outright bans on transfers involving cryptocurrency exchanges.
The findings expose tensions between Britain's ambition to attract digital-asset businesses and banks' efforts to prevent fraud, scams and money laundering.
The debate reflects broader questions surrounding the relationship between cryptocurrencies and traditional banking protections and the development of regulated institutional cryptocurrency infrastructure.
However, the figures come from voluntary complaints rather than a representative customer survey. They cannot establish which bank has the highest complaint rate.
Stand With Crypto is calling for clearer policies and more proportionate assessments of individual transactions.