SP 800-63-4 updates all four volumes of the framework – identity proofing (63A), authentication (63B), federation and assertion (63C), and risk management (63-4). The update formalizes new models for passkeys, digital wallets, and dynamic identity systems, alongside enhanced safeguards for biometric authentication, synthetic identity threats, and accessibility. The guidelines remain a de facto standard for federal agencies and private-sector frameworks alike, underpinning programs such as FedRAMP, FIPS 201, and the Office of Management and Budget’s M-19-17 policy.