NIST SP 800-63-4 NISTSP63R4-2: Identity Proofing: Evidence Collection, Remote Proofing, and Identity Validation Services

Conduct identity proofing per NIST SP 800-63-4 Volume A (Identity Proofing and Enrollment). Collect identity evidence per Section 4.3 (evidence quality tiers FAIR + STRONG + SUPERIOR) appropriate to IAL level. Conduct remote identity proofing per Section 5 with explicit support for (a) fully remote unattended proofing with document authentication + selfie capture + liveness detection, (b) supervised remote with trained operator, (c) Identity Validation Services (IDVS) per Section 4 as a new category in Rev 4 covering commercial identity verification providers operating under NIST conformance. Identity resolution per Section 4.4 (correlate evidence to single identity). Identity validation per Section 4.5 (confirm authenticity of evidence via authoritative source where available). Identity verification per Section 4.6 (bind validated evidence to the live applicant). Apply phishing-resistant + tamper-evident workflow with full audit trail.