Alastria DID Method Specification

Alastria DID Method is a decentralized identifier specification designed to provide interoperable digital identity management across multiple blockchain networks. This standard enables entities to create and manage persistent digital identifiers that remain under their control while being technology-agnostic.

The method implements the W3C Decentralized Identifiers specification while adding specific features for cross-blockchain compatibility and enterprise usage. It uses a unique DID format that includes network type and instance identifiers, allowing resolution across different blockchain implementations.

A key differentiating feature is its support for multiple blockchain networks through a modular architecture. The standard currently supports Quorum and Besu networks, with planned expansion to Hyperledger Fabric.

Here's a detailed technical analysis:

Purpose and Scope

• Provides a standardized way to create and manage DIDs across multiple blockchain networks
• Enables interoperable identity management in enterprise environments
• Supports the creation of "virtual" DID Documents without physical storage requirements

Key Technical Specifications

DID Format:

did:ala:<network>:<net-id>:<specific-idstring>

• network: Specifies blockchain type (quor, besu, fabr)
• net-id: Identifies specific network instance
• specific-idstring: Network-specific identifier

DID Document Structure:

• Uses JSON-LD format
• Implements EcdsaKoblitzPublicKey for key representation
• Supports secp256k1 curve for cryptographic operations

Implementation Requirements

1. Must support standard W3C DID resolution protocols
2. Must implement JWT format for credentials
3. Must use ES256K signature scheme
4. Must maintain compatibility with Ethereum key management

Security Considerations

• Implements JWT based security
• Uses secp256k1 curve cryptography
• Supports multiple authentication methods
• Provides credential verification mechanisms

Interoperability Features

• Cross-blockchain compatibility
• Support for multiple network types
• Standardized credential format
• Compatible with W3C Verifiable Credentials

Current Adoption Status

Currently implemented on:

• Alastria Red T network (Quorum-based)
• Alastria Red B network (Besu-based)
• Planning expansion to Hyperledger Fabric