did:meta

The Metadium DID Method (did:meta) is a blockchain-based decentralized identifier system designed to provide unique identification for individuals, organizations, and digital devices within the Metadium ecosystem. This method leverages the Metadium blockchain to enable user authentication and personal information verification services.

The method implements two core smart contracts:

• Metadium Identity Manager (MIM) - handles core identity operations
• Metadium Service Manager (MSM) - manages service-related keys and functions

did:meta identifiers are structured using a Metadium Identifier Number (MIN), which can be deployed on either the mainnet or testnet. The system supports multiple key types for different purposes:

• Management Keys - for identity control and authentication
• Service Keys - for service-related operations
• Recovery Keys - for identity recovery
• Provider Keys - for delegated operations

A notable security feature is the separation of recovery and management keys, with recommendations for third-party key custody. The method also considers GDPR compliance in its design, particularly regarding the handling of personal information and claims.

Example DID: did:meta:000000000000000000000000000000000000000000000000000000000000c141

Technical Details:

1. DID Generation and Structure:

• Format: did:meta:[network:]MIN
• Network options: mainnet or testnet (optional, defaults to mainnet)
• MIN: 64-character hexadecimal string
• Implements EIP1484 standard for identity management

2. Resolution Process:

3. Network identification (mainnet/testnet)

4. getIdentity function call to retrieve MANAGEMENT key

5. getKeys function call to retrieve SERVICE keys

6. Construction of DID Document with:

   • publicKey elements
   • authentication elements
   • service elements

7. Key Management and Security:

• Uses Secp256k1VerificationKey2018 for cryptographic operations
• Public key hashing via Keccak-256
• Supports multiple key types:
  • MANAGEMENT
  • SERVICE
  • RECOVERY
  • PROVIDER

4. Unique Characteristics:

• Implements JSON-LD context for META key types
• Supports claim/achievement structure
• GDPR-conscious design for personal data handling
• Delegated operations through provider keys

5. Technology Stack:

• Metadium Blockchain infrastructure
• Smart Contracts:
  • MIM (Identity Management)
  • MSM (Service Management)
• Compliant with:
  • W3C DID specification
  • EIP1484 standard
  • ISO 8601 for timestamps