# Decentralized Identity Verification for Citizens and Immigrants

> Blockchain-based citizen identity systems give citizens a self-controlled digital identity: government agencies issue verifiable credentials (ID card, driver's license, tax number); citizens hold them in a digital wallet; authorities and companies verify identity instantly and digitally without access to a central database. Estonia is the world's leading example of state-run blockchain identity.

**Sector:** Tertiary sector · **Industry:** Government agencies and public administration · **Organisation:** U.S. Citizenship and Immigration Services (USCIS) · **Maturity level:** Pilot

Canonical URL: https://www.sapientblock.com/en/use-cases/u-s-citizenship-buergeridentitaet-digital-sicher-ausstellen

## Documentation status

- **Project status:** Pilot
- **Evidence:** Evidence high
- **Editorial review:** Ufuk Avci, 15 April 2026

## Description

State blockchain-based citizen identity enables digital administrative services without paper-based identity proof. Estonia is the leading practical example worldwide.

Estonia as a role model: 99% of all government services are digitally accessible; tax declaration takes 5 minutes; elections via the internet; doctor appointments, prescriptions and medical records are digital. KSI Blockchain (Guardtime) secures the integrity of all government data. EU Digital Identity Wallet (eIDAS 2.0): All EU member states must provide an EUDIW by 2026 — the technical basis are W3C DIDs and Verifiable Credentials, optionally with a blockchain backbone. Germany: pilot projects for the German EUDIW implementation are underway; BundID as a preliminary stage. Applications: account opening without branch visit, doctor appointment without health insurance card, rental contract without ID copy.

## Benefits

- Authorities can significantly reduce their administrative costs through automation and fraud reduction.
- Citizens save time on administrative matters and have better control over their data.
- Identity theft and document forgery are significantly reduced through cryptographic security.
- Citizens gain full control over their personal data and can decide themselves which information to share.
- Processing times for administrative applications are shortened through automated verification processes.
- Authority staff can focus on value-adding advisory activities instead of repetitive document checks.

## Challenges

- High investment costs for blockchain infrastructure and staff training burden authority budgets.
- Citizens need to learn how to use digital wallets securely and manage their identity data.
- Integration with existing authority systems requires extensive technical adjustments and standards.
- Acceptance and trust of citizens in the new technology must first be established.
- Staff must be trained in new technologies and adapt to changed work processes.

## Sources

- [Nextgov: Homeland Security Funds 5 New Blockchain Projects (MATTR Ltd. für USCIS: digitale Ausstellung und Validierung von Lizenzen)](https://www.nextgov.com/emerging-tech/2020/10/homeland-security-funds-5-new-projects-exploring-blockchain-technology/169205/)
- [DHS SBIR Success Story: Digital Identity Protection](https://www.dhs.gov/science-and-technology/publication/dhs-sbir-success-story-digital-identity-protection)
- [e-Estonia: Secure and trusted business environment (KSI-Blockchain zur Sicherung staatlicher Datenflüsse)](https://www.e-resident.gov.ee/de/firma-ausland-gruenden/)