4.1 System Architecture Overview

ProofLayer employs a layered architecture that separates concerns and enables flexibility:

4.1.1 Application Layer

• User interfaces for issuing and verifying content
• SDKs and developer tools for integration
• API endpoints for programmatic access

4.1.2 Protocol Layer

• Cryptographic operations for document signing and verification
• Document verification logic
• Smart contracts for on-chain attestations

4.1.3 Storage Layer

• IPFS for content-addressed storage
• Blockchain for verification proofs
• Local caching mechanisms

4.1.4 Identity Layer

• Decentralized identifiers (DIDs)
• Verifiable credentials framework
• Key management infrastructure

4.1.5 Infrastructure Layer