Traditional Method
Email OTP Verification
Classic one-time password verification via email. User receives a 6-digit code and enters it in your app.
How It Works
Familiar verification flow users already know
Step 1
Send OTP Email
Call our API with the email address. We send a beautifully designed email with a 6-digit code.
Step 2
User Enters Code
User receives the email and enters the OTP code in your application.
Step 3
Instant Verification
Submit the code to our API. We verify and return a cryptographic proof token.
API Integration
Simple OTP verification API
1. Create Verification Request
curl -X POST https://api.proof.holdings/api/v1/verifications \
-H "Authorization: Bearer pk_live_YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"type": "email",
"channel": "email",
"identifier": "[email protected]"
}'2. Verify the Proof Token
# After user enters the OTP code from their email
curl -X POST https://api.proof.holdings/api/v1/verifications/VERIFICATION_ID/submit \
-H "Authorization: Bearer pk_live_YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"code": "847293"
}'Response Example
{
"id": "507f1f77bcf86cd799439011",
"type": "email",
"channel": "email",
"status": "verified",
"identifier": "[email protected]",
"verified_at": "2026-03-15T10:30:00Z",
"proof": {
"token": "eyJhbGciOiJSUzI1NiIs...",
"expires_at": "2026-04-14T10:30:00Z"
}
}