UK Regulator Tightens Crypto Custody Rules with Strict 24-Hour Threshold

The UK's Financial Conduct Authority (FCA) has unveiled proposed 'Cryptoasset Perimeter Guidance' aimed at closing regulatory loopholes and strengthening consumer protections within the digital asset sector. The proposal introduces a rigorous definition of custody, specifically targeting 'shadow custody' and technical service providers who may have previously operated outside regulatory scopes. A critical new benchmark is the 24-hour rule; any platform holding client assets for more than one day during trade settlement will be classified as a regulated custodian, necessitating a full safeguarding license. Additionally, node operators and validators will lose their technical exemptions if they offer 'added value' features, such as yield tools, reward-compounding, or user dashboards, requiring them to seek approval for arranging staking. The FCA is also addressing 'shadow custody,' ruling that any provider with the theoretical ability to override client authority is officially a custodian, regardless of whether they actually exercise that power. Furthermore, stablecoin issuers must now be established within the United Kingdom and manage the entire asset lifecycle, including initial offerings, redemptions, and reserve maintenance. The consultation period for these proposals closes on June 3, 2026, with final rules expected by September. A critical application window will run from September 30, 2026, to February 28, 2027. Firms that miss this deadline will not benefit from 'savings provisions' that allow continued operation during the deliberation process, leaving them vulnerable to fines, suspensions, or permanent shutdown.