🏗️ Wallet4Agent — Technical Stack Overview

For developers building trusted AI Agents able to interact with persons, companies, services, and other agents

Wallet4Agent provides the trust layer that AI Agents need to operate safely in the real world.
This document explains the technical components, standards, and identity mechanisms behind the platform.

1. 🎯 Purpose of Wallet4Agent

AI Agents increasingly take actions, access data, and collaborate.
To do this safely, they must be able to:

• 🆔 Prove who they are
• 👤 Prove who owns or controls them
• 📄 Hold verifiable credentials
• 🔐 Sign actions and data securely
• 🔗 Trust users, companies, and other agents
• 🪪 Authenticate to external systems without fragile API keys

Wallet4Agent provides AI Agents with:

• A DID-based identity
• A secure wallet for credentials
• Cloud KMS-backed signing keys
• Interoperability with OIDC4VCI, OIDC4VP, SD‑JWT, JSON-LD, OAuth2
• An MCP server interface for agents

Everything is standards‑based and interoperable.

2. 🧱 Architecture Overview

Wallet4Agent is built with three coordinated layers:

2.1 🖥️ MCP Server (Model Context Protocol)

• Single endpoint:
  POST https://wallet4agent.com/mcp
• Exposes all operations as tools:
  • Identity creation
  • Credential issuance
  • Verification flows
  • Signing operations
  • Configuration

2.2 👛 Identity Wallet

Manages:

• The Agent’s DID & DID Document
• Stored credentials (SD‑JWT VC, VC JSON‑LD)
• Linked Verifiable Presentations
• Wallet metadata & service endpoints

2.3 🔐 Authorization & Verification Layer

Supports:

• OAuth2 access tokens
• OIDC4VCI (credential issuance)
• OIDC4VP (presentation)
• User verification flows
• Agent‑to‑Agent authentication

All complex cryptographic and identity logic stays in Wallet4Agent.
Your agent simply calls MCP tools.

3. 🆔 Identity Layer (DID & DID Documents)

Each AI Agent receives a Decentralized Identifier (DID) compliant with the W3C DID Core specification.

Wallet4Agent supports two DID methods:

3.1 🌐 did:web (DNS-based identity)

A DID anchored on a domain.

did:web:wallet4agent.com:<agent-id>

⭐ Characteristics:

• Easy to resolve using HTTPS
• DID Document lives at:
  https://wallet4agent.com/did/<agent-id>
• Perfect for SaaS agents
• Human-readable, infrastructure-friendly
• Works well for corporate or platform-linked AI agents

🔗 DID:web specification:
https://www.w3.org/TR/did-spec-registries/#did-method-web

3.2 ⛓️ did:cheqd (ledger-based identity)

A DID anchored on the Cheqd decentralized ledger.

did:cheqd:<network>:<identifier>

⭐ Characteristics:

• Tamper-resistant DID Document stored on-ledger
• Supports ledger-anchored keys, rotations, service endpoints
• Ideal for:
  • High-assurance identity
  • Regulated environments
  • Trust registries
  • Decentralized compliance ecosystems

🔗 DID:cheqd specification:
https://docs.cheqd.io/identity/

4. 📄 DID Documents

Regardless of DID method, the DID Document exposes:

• 🔑 Public keys
• 🔐 Authentication methods
• 📌 Service endpoints
• 🧾 Linked Verifiable Presentations
• 🧬 Key types (JWK, Ed25519, etc.)

DID Documents are automatically updated when:

• Keys rotate
• New developer or agent keys are registered
• Credentials are published as Linked VPs
• Authentication methods change

External agents and services use the DID Document to verify signatures, credentials, and linked proofs.

5. 🔗 Linked Verifiable Presentations (Linked VP)

Linked VP allows Wallet4Agent to publish verifiable credentials inside the DID Document as references.

Why this matters:

• Public credentials become discoverable
• Third parties can verify agent capabilities
• Useful for:
  • Corporate mandates
  • Agent capabilities
  • Service trust signals
  • Compliance

... View full README on GitHub