Bank of England and Financial Conduct Authority published a joint regulatory approach document for systemic stablecoin issuers in the UK, setting out supervisory allocation, transition arrangements, and proportionate requirements for firms moving from FCA-only to joint regulation.

Why it matters

The UK authorities have now codified how systemic stablecoins will be regulated, fixing technical requirements around reserve composition, settlement infrastructure, prudential standards, and transition mechanics. The regime distinguishes between non-systemic (FCA-only) and systemic (joint BOE/FCA) issuers, with specific criteria for 'systemic at launch' designation. This locks in data schemas, reporting cadences, and technical interoperability expectations that will shape how UK stablecoin infrastructure operates. The Ethereum community — including reserve asset holders, settlement layer providers, and cross-border payment networks — can now provide feedback to the authorities on what data structures are already on-chain, what attestation practices are mature, and where the regulatory requirements align or conflict with existing technical standards and deployed infrastructure.