Stablecoin issuers face new regulatory hurdles

The UK Financial Conduct Authority (FCA) is set to open its formal cryptoasset and stablecoin authorisation gateway on 30 September 2026, while the US Department of the Treasury is finalising anti-money laundering (AML) enforcement under the GENIUS Act. Stablecoin issuers face a dual mandate, requiring them to meet regulatory standards while ensuring their infrastructure and cybersecurity are robust.

Meeting these standards is no longer just a legal hurdle, but also an infrastructure and cybersecurity imperative. Central banks and conduct regulators are bringing non-bank payment stablecoins inside the perimeter, and compliance hinges on technical capabilities such as automated secondary-market transaction blocking, cryptographic key governance, and operational resilience across hybrid financial networks.

Regulatory Alignment

The regulatory alignment between London and Washington creates an explicit timeline for fintech leadership. The UK FCA requires entities undertaking regulated crypto activities to apply for formal authorisation, while the US GENIUS Act designates Permitted Payment Stablecoin Issuers (PPSIs) as financial institutions under the Bank Secrecy Act.

Under CRYPTOPRU rules, firms must prove 1:1 backing assets, real-time T+1 redemption capabilities, and stress-tested capital controls. The US rules require issuers to deploy technical capabilities to freeze, block, or reject non-compliant secondary-market smart contract transactions.

Off-Chain Infrastructure

Recent threat intelligence shows a pronounced shift toward operational and integration vectors, with attackers targeting off-chain APIs, oracle feeds, and wallet custody architectures. Payment gateway API spoofing, custody and key exfiltration, and oracle manipulation are all potential vulnerabilities.

Real-world incidents, such as the $305m DMM Bitcoin exploit and the $235m WazirX breach, demonstrate how compromised key management and signer access can lead directly to catastrophic capital flight.

To mitigate these risks, security teams must deploy a defense-in-depth framework across three core vectors: dynamic API security, MPC-HSM custody, and third-party oracle and vendor risk management.

Technical Blueprint

To clear the FCA authorisation gateway and comply with US Treasury mandates, security teams must enforce Mutual TLS (mTLS) and OAuth 2.0 with strict proof-of-possession tokens across all mint and burn endpoints. They must also implement real-time behavioral anomaly detection on API endpoints and transition administrative key management to Multi-Party Computation (MPC) embedded within Hardware Security Modules (HSMs).

Additionally, firms must utilise decentralised, multi-sourced oracle networks with cryptographic Proof of Reserve (PoR) to verify fiat reserves before token issuance.