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

The UK's Financial Conduct Authority has introduced proposed crypto regulations that could 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 for firms handling client crypto assets. A key aspect of the rules is the 24-hour threshold for custody, where any firm 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 loss of their pure tech exemption, necessitating full approval for arranging staking. The regulator has emphasized that the new perimeter will enable stronger consumer protections and support fair, transparent markets as the sector evolves. Notably, the FCA has addressed the 'shadow custody' issue, clarifying that crypto service providers allowing theoretical override of client authority are considered custodians, even if they guarantee not to exert that power. The proposals also include mandates for stablecoin issuers, requiring them to be established in the UK and manage the entire lifecycle, from initial offering to redemption and reserve maintenance. The FCA is seeking views on these proposals until June 3, 2026, and intends to publish finalized rules and perimeter guidance later this year. The new regulations will require all entities providing crypto services to transition from the current money-laundering registration system to a stricter approval regime under the UK's Financial Services and Markets Act, with a five-month application window from September 30, 2026, to February 28, 2027.