did:sol

The did:sol method is a Decentralized Identifier implementation built on the Solana blockchain, designed to provide high-speed, low-fee DID management. This method leverages Solana's Proof-of-History consensus mechanism and enables the creation and management of DIDs across multiple Solana networks (mainnet, testnet, and devnet).

The method uses base58 encoding for identifiers and is built around a deterministic algorithm that generates 32-byte keys from the owner's public key on the x25519 ECC Curve. A unique feature is its "bump seed" mechanism that prevents address collisions with Solana's account space.

Key features include:

• Sparse DID Documents that can exist without on-chain registration
• Flexible fee payment structure allowing third parties to cover transaction costs
• Rent-based storage model with reimbursement upon DID deletion
• Support for multiple network environments through optional network identifiers
• Authority-based control system for DID document management

The method supports both minimal "sparse" DID documents and full-featured on-chain DID documents with extended capabilities. All operations are secured by Solana's blockchain infrastructure, providing robust security and immutability.

Technical Implementation:

1. DID Generation and Structure:

• Format: did:sol:[network]:[idstring]
• NSI length: 40-48 characters
• Uses base58 encoding with Bitcoin/IPFS alphabets
• Generated through deterministic hashing of:
  • Owner's public key
  • DID method
  • Bump seed
  • Program ID

2. Resolution Process:

• Strips did:sol prefix and network identifier
• Queries Solana blockchain for DID account
• Returns either:
  • On-chain DID document (if registered)
  • Generated sparse document (if unregistered)
• Uses Borsh serialization for document encoding

3. Key Management and Security:

• Primary control through Authority key
• Supports multiple capabilityInvocation keys
• Cold storage capability for sensitive keys
• Key rotation and recovery mechanisms
• Transaction signing requirements for all modifications

4. Unique Characteristics:

• Rent-based storage model
• Separate fee payer support
• Sparse document generation
• Network-specific addressing
• Bump seed collision prevention

5. Technology Stack:

• Built on Solana blockchain
• Uses x25519 elliptic curve cryptography
• Implements Borsh serialization
• Supports Ed25519VerificationKey2018
• Program ID: idDa4XeCjVwKcprVAo812coUQbovSZ4kDGJf2sPaBnM