did:eosio

The EOSIO DID Method provides a standardized way to create and manage Decentralized Identifiers on EOSIO-based blockchains. This method leverages EOSIO's unique account and permissions structure to enable Self-Sovereign Identity capabilities.

The method supports both public and private EOSIO chains through two identifier schemas:

• Registered chain name format: did:eosio:{registered_chain_name}:{account_name}
• Chain ID format: did:eosio:{chain_id}:{account_name}

Key features include:

• Support for EOSIO's hierarchical permission structure
• Multi-signature capabilities
• Permission delegation between accounts
• Compatibility with multiple key types including secp256k1 and secp256r1
• Integration with EOSIO's native account system

The method is designed to work with any unmodified EOSIO protocol (version 2.0+) and supports major public chains like EOS, Telos, WAX, and Europechain, as well as private/hybrid deployments.

Technical Implementation:

1. DID Generation and Structure:

• Uses EOSIO account names (1-13 characters: a-z, 1-5, .)
• Supports chain identification via registered names or chain IDs
• Implements fragment identifiers for referencing specific permissions

2. Resolution Process:

• Leverages EOSIO node APIs for DID document resolution
• Requires at least one LinkedDomains service endpoint
• Maps EOSIO permission structures to VerifiableCondition verification methods

3. Key Management:

• Supports multiple key types:
  • EOS_ and PUB_K1_: Uses EcdsaSecp256k1VerificationKey2019
  • PUB_R1_ and PUB_WA_: Uses JsonWebKey2020
• Implements hierarchical permission structures
• Enables weighted multi-signature schemes

4. Security Features:

• Transaction-based operations requiring authorized signatures
• Chain ID and block hash inclusion for replay protection
• Support for delegated authorities
• Optional permissioned access for private chains

5. Technology Stack:

• Built on EOSIO blockchain protocol
• Uses WebAssembly for smart contracts
• Implements W3C DID Core specifications
• Utilizes JSON-LD contexts for semantic interoperability

The method is maintained through the EOSIO Identity Working Group and provides reference implementations in JavaScript and as Docker containers.