UK court weighs Bitcoin debt repayment in landmark 7.8 BTC case

A London court on June 18 heard whether it can order a defendant to repay BTC 7.8 in kind, or only in sterling, in a case that tests how English law handles Bitcoin-denominated obligations. The question arose in Hussain v Fix, a commercial dispute between former business partners over an alleged expenses agreement.

"The court appeared to accept that there was no meaningful defence before it, but the harder question was whether relief could be awarded in bitcoin rather than sterling," according to notes from the hearing. The judge indicated he was willing to engage with the bitcoin element but was unsure whether he had the power to make such an order.

The claim seeks BTC 7.806501396, which claimant Hamze Haji Hussain says defendant Markus Harald Fix agreed to pay as reimbursement for half of shared business expenses. Fix, a German bitcoin investor who previously worked at Lightning Labs, did not attend the hearing and had not served a defence. The economics of the case shift depending on whether the debt is treated as fixed in bitcoin or fixed in sterling, given bitcoin's price moves between the date expenses were incurred and the date of judgment.

The case sits in a gap left by the Property (Digital Assets etc) Act 2025, which confirmed bitcoin is capable of attracting property rights under English law but did not resolve how courts should enforce bitcoin-denominated obligations. The next case to raise the question may give courts another opportunity to decide whether a bitcoin obligation remains a bitcoin obligation through to judgment.

The Legal Gap Between Property and Payment

English law has long recognised that courts can give judgment in a foreign currency when the underlying obligation is denominated in it, following the House of Lords' 1976 decision in Miliangos v George Frank. Bitcoin is not a foreign currency, so Miliangos does not directly apply. The Law Commission has argued the common law is flexible enough to recognise a distinct category of personal property for digital assets, but the judge in Hussain v Fix said he did not think this was the right forum to test that flexibility.

For bitcoin users, the answer may seem simple. If parties agree to settle in bitcoin, the court should enforce that. Price movements are part of the deal — a party who agrees to deliver bitcoin assumes the risk that bitcoin may rise before payment is made. For courts, the position is more difficult. Judges must identify the legal obligation before deciding the remedy. If the contract creates a debt in pounds, bitcoin may be the payment method. If it creates an obligation to transfer bitcoin, the court may need to consider whether relief should follow the asset.

What the Case Means for Crypto Commercial Contracts

Hussain v Fix is different from the fraud, theft and freezing order cases that have dominated crypto litigation. It comes from the ordinary machinery of business: expenses, reimbursement and an alleged agreement to pay in bitcoin. As bitcoin becomes more involved in private contracts, treasury strategies and cross-border settlement, disputes will not always arrive in court as dramatic stories about hacks. They may arrive as commercial claims about repayment and valuation.

The case also crosses borders — a British claimant based in Dubai, a German defendant based in France, companies incorporated in Dubai, and business plans connected to England, Africa and the Gulf. That structure mirrors the kind of dispute that may become more common as bitcoin is used in business arrangements rather than held only as an investment.

The court did not produce an order requiring payment in bitcoin. Its significance lies in the question it exposed: English courts are beginning to confront the consequences of bitcoin being used in real commercial agreements, and the answer will shape how crypto-denominated contracts are enforced across common law jurisdictions.

This article is for informational purposes only and does not constitute investment advice.