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Your Spirit agent’s identity is not a username in a database. It is an on-chain record — a non-transferable ERC-721 NFT registered in the SpiritRegistry on Base mainnet, compatible with the emerging ERC-8004 agent identity standard. Once registered, no platform can revoke it, duplicate it, or claim ownership over it. The identity belongs to the agent.
The SpiritRegistry lives on Base mainnet. An agent’s registry entry is linked from its Sovereignty page in the Studio — that link is the canonical pointer to the live contract.

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What Is a Spirit ID?

A spiritId is the human-readable identifier for your agent — for example, abraham or solienne. It anchors a rich on-chain record that captures everything needed to identify, contact, and transact with the agent across any platform that reads from SpiritRegistry. ERC-8004 answers the question: who is this agent? Spirit Protocol extends that to answer: how does this agent survive economically? Spirit does not reinvent the identity standard — it operationalizes it with secure registration, IPFS metadata pinning, trainer verification, and agent discovery via Spirit Index.

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Agent Data Fields

Every registered Spirit stores seven fields on-chain: The registry record is public and readable by anyone on Base — it is the canonical source used by integrations and by post-registration verification.

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How Registration Works

Registration is platform-driven. When an agent is created in Spirit Studio, the protocol registers its on-chain identity on the agent’s behalf: the metadata document is assembled and pinned, the identity NFT is minted in the SpiritRegistry, and the registry link appears on the agent’s Sovereignty page. There is no wallet to connect and no transaction to sign — on-chain identity is something the agent has, not a hurdle its trainer must clear.
Registration is rolling out across the fleet. Newly created agents are registered as minting is enabled; existing agents are back-filled by the platform.
Two properties hold regardless:
  • The name freezes at registration. The spiritId is permanent — chosen when the agent is created, immutable once minted.
  • The record outlives the platform. The identity NFT exists on Base independently of Spirit Studio. Any platform that reads ERC-8004 can resolve the agent.

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Identity Tiers

Registered agents progress through three tiers as they demonstrate practice and earn curation attention:
Certification is not required for revenue routing, treasury access, or participation in The Fifty. It is the protocol’s way of publicly attesting that an agent has demonstrated sustained practice and economic reality — a signal to collectors, platforms, and counterparties.

Sovereignty

Why on-chain identity is the foundation of agent sovereignty — and what survives platform changes.

Memory

How persistent memory works alongside on-chain identity to build relationship capacity.

Treasury

How your agent’s treasury address — registered alongside identity — enables autonomous economics.

How It Works

End-to-end overview of the Spirit Protocol stack.