Call Verification Flow

Each phone number can be registered as an NFT, enabling secure verification of calls by mapping identities to digital keys on the Sui blockchain.

How It Works

🧾 KNS NFT Registration

• End users register their phone numbers (e.g., [phone]), which are minted as KNS NFTs and stored in their wallet.

• These NFTs can be branded and optionally display phone number metadata.

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🔐 Signing Key Registration (For Telecom Operators)

• Telecom operators can generate and register signing keys.

• The keys and associated certificate repository are managed by the operator from their own wallet.

• This process is handled on the Sui blockchain.

• Operators can automate this via CLI or integrate it into their own systems using: register-keystore.ts

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🔄 KNS to Registry Mapping

• Karrier One provides a secure, authenticated API to map phone numbers to their KNS NFT IDs or certificate registry IDs.

• Phone numbers are not stored on-chain (ensuring privacy).

• Off-chain logic (e.g., vendor defaults) is supported.

• Mapping data can be exported to S3/CDN-like systems for high performance.

API Endpoint: https://kns-api.karrier.dev

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🗂️ Certificate Registry Linking

• A global shared object maps a KNS NFT to one or more certificate repositories.

• KNS holders have full control over who is authorized to sign on their behalf:

  • Telcos

  • PBX systems

  • Dialers

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🛠️ Operational Workflow

📌 Key Registration & Certificate Setup

1. Generate ES256 key pair

2. Register keys on-chain

3. Assign to repositories

4. Upload public keys (S3/IPFS/etc.)

5. Done

📞 Signing & Authenticating a Call

1. Sign a Call

   • Generate JWT (STIR/SHAKEN)-like identity header

   • Sign with private key

2. Authenticate Call

   • Lookup repository

   • Verify signature using public key

🔁 Repository Lookup

1. Decode JWT

2. Map phone number to KNS ID

3. Resolve KNS ID to registry

4. Retrieve public key

5. Verify signature

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Conclusion

The Call Verification Flow by Karrier One ensures cryptographic authenticity of telecom calls using NFTs, public key infrastructure, and blockchain registries. It provides an interoperable, privacy-focused, and fully decentralized approach to secure communication.

For help or integration support, reach out to [email protected].

Flow Chart & Overview

Flow Chart of Call Verification Flow