Add the X Stamp

[lebraat]

User Story:

As a Passport user
I want to verify my X account status and credibility
So that I can increase my humanity score using my verified X presence as proof of being human

Acceptance Criteria

Core Requirements:

• ✅ Has verified status: Premium, Premium+, Business, Government, or Legacy verification
• ✅ At least 100 followers
• ✅ Account age > 365 days

Assigned points: 3.2

Verification Flow:
GIVEN a user wants to verify their X account
WHEN they initiate X verification
THEN the system should:

1. Authenticate via X OAuth2
2. Retrieve user profile and verification status
3. Check all 3 requirements are met
4. Award points based on verification tier

Technical Implementation

https://github.com/lebraat/x-verifier

API Requirements:

• X API v2 access
• OAuth 2.0 authentication flow
• User lookup endpoint for verification status
• Rate limiting: 300 requests/15-min window

Verification Status Detection:

// Check for verified badge types
const verificationTypes = {
  premium: 'blue',           // $8/month
  premium_plus: 'blue_plus', // $16/month
  business: 'gold',          // $1,000/month
  government: 'gray',        // Government verified
  legacy: 'blue_legacy'      // Pre-Elon verification
}

Key Design Decisions

Why These Requirements:

• Paid verification: Direct financial cost creates strong Sybil resistance
• 100+ followers: Shows actual social presence, not just payment
• Account age: Prevents new account farming, requires time investment

Risks & Mitigation:

• API costs: X API Pro tier expensive - optimize calls
• Rate limits: Implement queueing system
• Verification changes: X frequently updates verification system
• Regional availability: Premium not available in all countries

Priority: HIGH - Extremely strong Sybil signal
Effort: MEDIUM - Need X API setup and approval
Impact: VERY HIGH - Paid verification is costly to fake