By Lukas Dickie, Changefly’s Founder

Today I’m excited to share something we’ve been working intensely on: Changefly ID + Anonymized Identity & Age Verification. The keyword here is anonymized. Our digital lives are a constant trade-off between convenience and privacy, where every new account, every login, and every purchase adds another piece of our personal data to a vast, insecure, and interconnected web. This model has led to a plague of data breaches, identity theft, and online abuse. Changefly ID + Anonymized Identity & Age Verification offers a new way forward, one where we can prove who we are — without revealing who we are.

Changefly ID addresses these issues with a novel approach: Anonymized Identity and Age Verification. Instead of sharing your personally identifiable information (PII), Changefly ID uses advanced cryptographic techniques to verify your attributes without ever revealing the underlying data.

Changefly ID with Anonymized Identity and Age Verification

Here’s how it works

Zero-Knowledge Proofs: This is the core of the technology. A zero-knowledge proof allows a user to prove a statement is true without revealing any information beyond the validity of the statement itself. For example, a website might need to know if you are over 18. Instead of sending your date of birth, which is sensitive PII, you would provide a cryptographic proof that you are indeed over 18. The website gets the verification it needs, and your privacy remains intact.

Secure Multi-Party Computation: This technique allows multiple parties to compute a function over their inputs while keeping those inputs private. In the context of Changefly ID, this could be used to verify that a user is a unique individual without revealing their personal details to any single party.

Temporary, Unique Identifiers: Changefly ID replaces traditional login credentials like email addresses, phone numbers, usernames, and passwords with cryptographically secure, temporary anonymous identifiers. This makes it impossible for threat actors and bots to perform credential stuffing attacks and drastically reduces the risk of account takeovers.

Here’s who it benefits

For end-users, Changefly ID simplifies the digital experience while maximizing privacy and security. You can verify your age to access a service or prove you are not a bot without fear of your data being compromised. You no longer have to remember countless logins or worry about your information being sold or misused. Your PII stays where it belongs: with you.

For product developers, this technology solves a major compliance and liability headache. Instead of handling and securing vast databases of sensitive user data (and all the regulatory requirements that come with it, such as GDPR and CCPA), developers can simply request a verified attribute. This "proof, not data" model reduces the attack surface, minimizes the risk of data breaches, and streamlines compliance. It allows developers to focus on building great products, not on becoming security experts responsible for millions of users’ personal information.

Changefly ID represents a fundamental shift in how we think about digital identity. By putting privacy first and using cutting-edge cryptography, it offers a path to a safer, more secure, and less-intrusive internet for everyone.

Here’s how we’re radically different

Protects Against Identity Theft: Traditional verification methods (SSNs, phone numbers, scanned IDs) create centralized databases of PII—honey pots for hackers. When breached, that data can be used for: opening fraudulent accounts, impersonating victims, and bypassing security systems elsewhere. With Changefly ID anonymized identity, there’s no central database of personal info stored, no fixed identifier reused across services (like an email address, phone number, or username), and nothing for attackers to steal or sell if a service is compromised.

Stops Online Tracking: Advertisers, platforms, and threat actors typically track users via persistent identifiers (email addresses, phone numbers, device/browser fingerprints, login credentials reused across sites, etc). Changefly ID anonymized identity fights this by generating new, ephemeral identifiers per connection, does not expose or link personal data across services, and disables cross-site correlation, so platforms can’t build user profiles over time. Changefly’s radical break from known identifiers inherently blocks tracking mechanisms like behavioral analytics tools that follow users across domains, data brokers aggregating activity tied to a single identity, and targeted advertising based on cross-app/user data.

Changefly ID + Anonymized Identity & Age Verification is like showing a bartender a “Yes, I’m over 21” hologram badge instead of handing them your driver’s license with your name, address, and birthdate. They get what they need—but none of what they shouldn’t have.

Here’s an example developer API request

cURL example:

curl -X POST https://services.changeflyapi.com/v1/api/authenticate \
  -H "Content-Type: application/json" \
  -d '{
    "api_private_key": "YOUR API PRIVATE KEY",
    "api_connection_key": "YOUR API CONNECTION KEY",
    "ip_address": "USER IP ADDRESS",
    "changefly_id": "USER CHANGEFLY ID"
  }'

JSON reponse:

{
    "status": "OK",
    "response": {
        "success": 1,
        "changefly_connection_id": "UNIQUE ID ASSIGNED TO USER",
        "identity": {
            "type": "person",
            "country": "US",
            "age_verification": 18
        }
    }
}

Available now

To verify and anonymize your identity:

https://www.changefly.com/account/verify

To verify Changefly ID’s and age requirement checks:

https://www.changefly.com/developer

We’re just getting started, and I’d love to hear what you think, what you’d like to see next, and any feedback you have.

Lukas
hello@changefly.com