username.md

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username.md is digital identity infrastructure for businesses, developers, and AI-agent builders. It provides persistent, web-addressable identities that can be independently resolved and verified across platforms and applications. AI agents can have their own identity using did:web decentralized identifiers, signed claims and responses, machine-readable profiles, and MCP-based resolution and verification. Developers can integrate username.md through APIs and open web standards to establish verifiable identity for humans, agents, and applications. Unlike identity that exists only inside a specific platform or session, username.md is designed to provide a persistent identity layer that remains independently verifiable across environments.