Use cases
Privacy-preserving identity across digital and physical workflows.
Each use case shows the problem, Hash.Contact flow, information shared, and privacy benefit.
Use cases
15
Categories
15
Core pattern
Proofs
Passwordless customer login
Consumer apps
Business problem
Users forget passwords and businesses inherit account recovery risk.
Hash.Contact flow
A site starts a QR or push challenge and Hash.Contact confirms user approval.
Information shared
Authentication result and scoped session metadata.
Not shared by default
No password is typed into the requesting website.
Private guest check-in
Hotels and travel stays
Business problem
Hotels often collect more identity data than a stay requires.
Hash.Contact flow
The guest reviews a one-time request for age, identity, and address verification.
Information shared
Identity verified, age above 18, address verified.
Not shared by default
The hotel gets assurance without storing unnecessary raw identifiers.
Credential verification
Hiring teams
Business problem
Candidates repeatedly upload sensitive documents.
Hash.Contact flow
A candidate approves verified education or employment attributes.
Information shared
Credential status, issuer, verification date.
Not shared by default
Reusable verification reduces document handling.
Age-gated checkout
Online merchants
Business problem
Merchants need age assurance without full birth dates.
Hash.Contact flow
Hash.Contact confirms age threshold for a checkout session.
Information shared
Age above required threshold.
Not shared by default
The buyer avoids exposing exact date of birth.
Privacy-first intake
Clinics and care providers
Business problem
Clinics need accurate contact and identity data with clear consent.
Hash.Contact flow
The patient approves only the attributes needed for the visit.
Information shared
Verified identity, contact permission, insurance status placeholder.
Not shared by default
Consent records stay visible to the patient.
Physical venue check-in
Venues and event teams
Business problem
Venues need fast entry and auditability.
Hash.Contact flow
A public QR starts a business-scoped check-in request.
Information shared
Ticket holder verified, age threshold, access status.
Not shared by default
The visitor keeps contact details private unless required.
Step-up account access
Banks and financial services
Business problem
High-risk actions need stronger confirmation without training users into weak OTP habits.
Hash.Contact flow
The bank requests a scoped Hash.Contact approval for a transaction or profile change.
Information shared
Approval result, assurance level, and request identifier.
Not shared by default
Security checks become explicit, purpose-bound, and visible in the user's activity log.
Reusable onboarding verification
FinTech products
Business problem
New financial apps ask users to repeat the same verification steps.
Hash.Contact flow
The app requests configured attributes and records a consent-backed verification response.
Information shared
Identity verified, contact verified, residency status.
Not shared by default
Onboarding can be faster while reducing unnecessary sensitive data handling.
Student status verification
Universities and student platforms
Business problem
Student offers and campus tools often require proof without needing full academic records.
Hash.Contact flow
Hash.Contact confirms active student status from a verified source.
Information shared
Student status, institution, verification date.
Not shared by default
Students can prove eligibility without exposing academic history.
Travel document readiness
Travel apps
Business problem
Travelers need reminders and eligibility checks without broadcasting document numbers.
Hash.Contact flow
A travel app requests a document-validity proof and expiry status.
Information shared
Passport valid, expiry window, nationality when required.
Not shared by default
The app can warn about readiness without storing full travel documents.
SIM activation verification
Telecom providers
Business problem
Telecom onboarding frequently handles highly sensitive identity documents.
Hash.Contact flow
The provider requests required identity and address proofs through a consent screen.
Information shared
Identity verified, address verified, contact verified.
Not shared by default
The customer sees exactly what is requested and why.
Tenant screening consent
Property managers
Business problem
Rental applications collect broad personal files before eligibility is clear.
Hash.Contact flow
The applicant approves staged verification for identity, address, and employment attributes.
Information shared
Identity verified, address verified, employment status.
Not shared by default
Screening starts with proofs rather than a large bundle of personal records.
Service access assurance
Public service portals
Business problem
Digital services need assurance while keeping collection proportional to the service.
Hash.Contact flow
A service requests a configured assurance level and required attributes.
Information shared
Assurance level, residency, contact verification.
Not shared by default
The UI keeps legal definitions configurable and avoids overclaiming.
Workforce login and recovery
Enterprise IT
Business problem
Employee access and recovery flows are high-impact and often fragmented.
Hash.Contact flow
Employees approve login, MFA, and recovery events through Hash.Contact.
Information shared
Authentication result, device status, employee credential.
Not shared by default
IT gets a consistent auth signal while employees retain separation from personal identity data.
Trusted seller verification
Marketplaces
Business problem
Marketplaces need trust signals but sellers may not want raw identity data spread across platforms.
Hash.Contact flow
The seller approves a marketplace-scoped alias and verified seller attributes.
Information shared
Identity verified, mobile verified, marketplace alias.
Not shared by default
Scoped aliases reduce unnecessary cross-service correlation.
Consent ledger
Use cases still land in one understandable control surface.
Whether the request starts online, in a mobile app, or at a physical check-in point, access should remain visible and revocable.
| Organization | Purpose | Shared | Duration | Status |
|---|---|---|---|---|
| Acme Hotels | Guest verification | Age 18+, identity, address | One-time | Pending |
| Northstar Marketplace | Seller onboarding | Mobile, identity | 30 days | Approved |
| ABC Employer | Credential check | Employment status | Expired | Expired |
| City Events | Venue entry | Ticket holder, age | One-time | Completed |
Every approval has a purpose.
Requests can be grouped by organization, attribute, duration, status, or exposed contact path.
No hidden access
Empty, loading, and blocked states are designed as first-class surfaces for future backend data.