privacy-creds 0.1.1

Privacy-preserving identity verification SDK for games and applications

privacy-creds

Privacy-preserving identity verification for games and applications.

Players prove who they are (age, region) without exposing personal data. No names, no IDs, no documents stored — just cryptographic proofs.

The problem

Games need age verification and regional compliance. Current solutions require uploading government ID to a database — creating breach risk and GDPR headaches.

The solution

Player verifies ID once → credential stored on their device →
game receives a yes/no answer → never sees the raw identity data

How it works

1. KYC provider verifies the player's identity and issues a signed credential
2. Player's device stores the credential with a device-bound private key
3. Game sends a random challenge → player signs it → game verifies the signature and checks the claim

The game learns one thing: "Is this player over 18?" Nothing else.

Security layers

Layer	Protection
Issuer signatures	Prevents forged credentials
Challenge-response	Prevents replay attacks
Device binding	Prevents credential sharing between devices

Installation

pip install privacy-creds

Quick start

Game backend (verifier)

from privacy_creds import GameVerifier

verifier = GameVerifier(issuer_pubkey_pem=open("issuer_public.pem").read())

# Per player session:
challenge = verifier.create_challenge()
# ... send challenge to player, receive proof back ...
result = verifier.verify(proof, required_age=18)

if result:
    print("Access granted")
else:
    print(f"Denied: {result.reason}")

Player app (wallet)

from privacy_creds import PlayerWallet

wallet = PlayerWallet(user_id="player123")
wallet.setup(credential_from_kyc_provider)

# When game requests verification:
proof = wallet.prove(challenge_from_game)
# ... send proof to game ...

Issuer (KYC provider)

from privacy_creds import Issuer, FileStorage

issuer = Issuer(storage=FileStorage("/secure/path"))
issuer.generate_keys()

credential = issuer.issue(user_id="player123", age=22, country="GB")

Running the demo

git clone https://github.com/cairnintelligence/privacy-creds.git
cd privacy-creds
pip install -e ".[dev]"
python -m examples.demo

Running tests

pytest

Supported age thresholds

• 13 (COPPA)
• 16 (GDPR minimum)
• 18 (most gaming regulations)
• 21 (US gambling)
• 25 (rental/financial services)

Roadmap

• Zero-knowledge proof layer (Noir/zkSNARK)
• REST API wrapper (FastAPI)
• React Native player app
• TPM/Secure Enclave hardware key storage
• Credential expiry and renewal
• Multi-issuer trust federation

License

MIT — see LICENSE.

Built by

Cairn Intelligence