UK's New Crypto Regulations: A 24-Hour Deadline That Could Catch Firms Off Guard

The UK's Financial Conduct Authority has proposed new crypto rules that may broaden the definition of custody, potentially affecting platforms and software providers that do not consider themselves custodians. The FCA's Cryptoasset Perimeter Guidance, published recently, outlines several technical traps that firms handling clients' crypto assets must be cautious of. A key aspect of the rules is the 24-hour threshold for custody, where any firm or crypto platform holding client assets for more than a day during trade settlement may be classified as a regulated custodian, requiring a full safeguarding license. Validators and node operators must also exercise caution, as providing 'added value' features such as user dashboards or yield tools may lead to the loss of their pure tech exemption, necessitating full approval for arranging staking. The regulator has emphasized that its new perimeter is designed to strengthen consumer protections and support fair, transparent, and orderly markets as the sector evolves. Notably, the FCA has addressed the issue of 'shadow custody' for the first time, clarifying that if a crypto service provider can theoretically override a client's authority, it is considered a custodian, even if it guarantees it will never exert that power. The document also notes that the use of smart contracts, public blockchains, or decentralization elements does not determine the perimeter position or exempt an arrangement from regulation. For stablecoin issuers, the rules are clear: issuance is only legal if the issuer is established in the UK and manages the entire lifecycle, from initial offering to redemption and reserve maintenance. The FCA has invited views on these proposals until June 3, 2026, and intends to publish finalized rules in policy statements this summer, followed by the final perimeter guidance in September. The roadmap requires all entities providing crypto services to transition from the current money-laundering registration systems to a stricter approval regime under the UK's Financial Services and Markets Act. Firms intending to continue operating under the new regulations have a five-month application window, from September 30, 2026, to February 28, 2027, and failure to meet this deadline may result in fines, suspensions, or permanent closures. Only those who apply during the application period will benefit from the 'savings provisions' that allow them to continue operating while the regulator deliberates.