Give the agent a decentralized identifier (DID), publish a DID Document that authorizes its public keys and service endpoints, and keep the corresponding private key under controlled custody. The agent then signs protocol messages. A verifier resolves the DID, checks that the returned document matches the requested identifier, confirms that the signing key is authorized, validates the signature and replay protections, and examines verifiable credentials for claims that a key alone cannot prove.
What a verifiable decentralized identity gives an AI agent
A decentralized identifier is a persistent-looking identifier whose meaning does not depend on one centralized identity provider or certificate authority. W3C DID Core, published as a Recommendation on 19 July 2022, defines a DID as an identifier that can be decoupled from centralized registries, identity providers and certificate authorities. The specification describes DIDs as “a new type of identifier that enables verifiable, decentralized digital identity.”
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A DID resolves to a DID Document. That document can publish cryptographic verification methods, relationships such as authentication, and service endpoints used to contact the agent. The private key corresponding to a published public key stays with the agent’s operator or an authorized delegated controller. The agent proves control by signing a message; a verifier checks the signature against the public key named in the DID Document.
This proves control of an identifier and its authorized keys. It does not prove that the agent is safe, competent, honest, operated by a particular company, running a particular model, or capable of delivering an advertised result. Those are separate assertions. They require issuer-signed verifiable credentials and a verifier that evaluates the issuer, subject binding, validity and status of each credential.
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The W3C AI Agent Protocol Community Group’s Agent Identity and HTTP Authentication draft states that “A DID is a verifiable identifier and is not necessarily a stable human-readable name.” Treat the DID as a cryptographic handle, not as a brand name or a promise about behavior.
Decide what the identity must prove
Identify the controlling party
Write down who controls the agent key and who is allowed to replace it. The controller could be an individual, a company, a service account, a parent agent or a multisignature governance process. A deployment may use one DID for the agent and another DID for its operator, with a credential or explicit delegation connecting them.
Separate human accountability from runtime authority. The person or organization that accepts legal and operational responsibility should not automatically receive every permission available to the software process. Give the running agent only the signing and service permissions it needs.
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- Key-control claims: the signer controls a private key authorized by the DID Document.
- Operator claims: a named person or organization controls or sponsors the agent.
- Software claims: a particular release, source build or model configuration is deployed.
- Capability claims: the agent is approved to perform a defined action, such as submitting orders or reading a data set.
- Environment claims: the agent runs in an approved cloud account, enclave or network.
Only the first category follows from DID key control. Require credentials for the others, and specify which issuer is trusted for each claim before deployment.
Define the threat model
List the consequences of a stolen key, a modified DID Document, a compromised endpoint, a replayed request and an unavailable resolver. Decide whether an attacker who controls the endpoint can impersonate the agent, whether the agent may delegate signing to another process, and how quickly you must revoke credentials or rotate keys. These decisions determine storage, monitoring and recovery requirements.
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Choose a DID method and hosting model
A DID method defines how identifiers are created, resolved, updated and recovered. The method is an architectural choice, not a security rating. Compare custody, recovery, delegation, governance, portability, privacy, resolver availability and operational cost.
| Option | Useful characteristic | Trade-offs to evaluate |
|---|---|---|
| did:web | Reuses DNS and HTTPS for a web-hosted DID Document. | Depends on domain control, web hosting, TLS operations and the availability of the resolver path. Domain transfer and account recovery become identity-recovery concerns. |
| did:wba | Supported by the W3C AI Agent Protocol identity profile for agent-oriented authentication. | Check the profile’s deployment and resolver requirements, governance and interoperability with the systems that must call the agent. |
| did:webvh | Also listed as a supported binding profile in the W3C AI Agent Protocol draft, with verifiable-history considerations. | Assess hosting, history retention, update and recovery procedures, and whether counterparties implement the same profile. |
| On-chain registry such as ERC-8004 | Publishes an agent identifier and a URI that points to a registration file. That file can list endpoints, wallet addresses, DIDs and ENS names. | Adds chain, transaction, registry and network-dependency risks. The registry linkage does not cryptographically guarantee that advertised capabilities work or that the agent is non-malicious. |
For a single web service, a self-hosted web DID is often the simplest operational starting point. Use an on-chain registry when public discoverability, cross-domain lookup or portability justifies the additional dependencies. The W3C AI Agent Protocol draft requires conforming implementations to support did:wba, did:web and did:webvh binding profiles, but support by your counterparties still needs to be verified.
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1. Create an identity and key inventory
- Assign a unique DID to the agent deployment or identity domain you intend to operate.
- Record the controller, deployment environments, allowed protocols, recovery authority and expected key lifetime.
- Decide whether development, staging and production use separate DIDs. Separate identifiers limit blast radius and make audit trails clearer.
Do not use a human-readable name as the security boundary. Names can change; the verifier should rely on the DID and the keys authorized by its document.
2. Generate and protect the signing key
Generate the agent’s signing key with a cryptographically secure facility appropriate to the deployment. Keep the private key outside prompts, conversation history, logs, source control, container images and ordinary application configuration. Prefer a hardware-backed or managed key store with access policies, audit logs and non-exportability where your environment supports it.
- Give the runtime only the operation it needs, normally signing, not unrestricted key export.
- Restrict which hosts, processes and service accounts can request signatures.
- Keep an administrative or recovery path separate from the live runtime path.
- Set a rotation schedule and document how the next key is introduced before the old one is removed.
- Prepare compromise procedures: disable the key, publish an updated document, revoke affected credentials and notify relying parties.
Backups must be encrypted and access-controlled. A backup that anyone can restore is another copy of the private key, not a recovery plan.
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3. Publish the DID Document
The DID Document’s id must be exactly the DID being resolved. Include a verification method containing the public key, place that method in the authentication relationship when it signs authentication requests, and publish only the service endpoints needed by the agent protocols. Keep endpoint metadata minimal; never place private keys, bearer secrets or unnecessary personal information in the document.
When you add a new key, publish it before using it. During rotation, keep the old verification method available long enough for in-flight messages and credential checks, then remove or mark it revoked according to the DID method’s rules. A verifier should treat a document fetched from an unexpected location, with a mismatched id, as invalid.
4. Bind the runtime to the key
Configure the gateway or protocol adapter—not the language-model prompt—to perform signing. Every signed request or response should bind the signature to its context. Include an audience identifying the intended service, a timestamp, a unique nonce and a body digest or equivalent representation. The verifier can then detect a message copied to another endpoint, altered in transit or submitted again later.
Keep signing code in a narrow, testable boundary. The model may request an action, but policy code should decide whether the action is permitted and which key, audience and credential scope apply. Log the protected message metadata and verification result without logging private material or sensitive payloads unnecessarily.
5. Verify incoming interactions
- Parse the claimed DID and the message’s key identifier without trusting either as proof.
- Resolve the DID using a resolver that supports the selected method.
- Confirm that the returned DID Document’s
idexactly matches the requested DID. The W3C agent identity profile explicitly includes this matching step. - Locate the verification method identified by the message’s
keyid(or equivalent reference). - Check that the method is authorized for authentication or for the specific relationship required by the protocol.
- Validate the signature over the exact canonicalized message or signing input.
- Check audience, timestamp, nonce, body digest, expiration and any method-specific freshness rules.
- Check key status, document update state and any revocation information available to your profile.
- Only after cryptographic checks succeed, evaluate credentials and application authorization.
Fail closed for an unknown key, a stale nonce, an invalid signature, an unavailable required resolver, a mismatched document identifier or a credential that is expired or revoked. Return diagnostic information that helps an operator troubleshoot without revealing secrets.
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Use verifiable credentials for operator, capability and provenance claims
A verifiable credential is an issuer-signed format for cryptographically verifiable information. A credential can state that an organization operates the agent, that a software release passed an assessment, that a capability was approved, or that a deployment belongs to a particular environment.
Issuing a credential
- Choose an issuer whose authority is meaningful for the claim. An internal security team may issue a deployment credential; a regulator or business partner may issue a compliance credential.
- Bind the credential subject to the agent’s DID, not merely to a mutable display name.
- State the claim narrowly, including scope, audience, issue time, expiration and any conditions.
- Sign the credential with the issuer’s authorized key and publish the issuer information needed for verification.
- Define status and revocation handling before issuing it. Short validity periods reduce the window in which a withdrawn approval remains usable.
Verifying a credential
- Resolve and authenticate the issuer.
- Validate the credential proof and its signing input.
- Confirm that the subject is the agent DID you are evaluating.
- Check issue and expiration times, status or revocation, and any audience or usage restriction.
- Apply issuer trust policy; a valid signature from an unknown issuer is not sufficient.
- Request and retain only the claims needed for the decision.
A credential can attest to an approved capability, but it does not make every future response safe. Pair credentials with runtime authorization, monitoring and limits on side effects.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Should you register the agent with ERC-8004?
ERC-8004 defines an identity registry that assigns an agentId and agentURI and points to a registration file. That file may list protocol endpoints, wallet addresses, DIDs and ENS names. Registration can make an agent easier to discover across domains and can provide a portable pointer to identity metadata.
Use the registry when the ecosystem you need to reach actually resolves it and when public discoverability or cross-domain portability is worth the chain dependency. Budget for network selection, transaction signing, key custody, confirmation behavior, indexing and recovery if the registry or referenced URI changes.
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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallDo not present registration as a safety certification. ERC-8004’s linkage does not cryptographically guarantee that an advertised capability is functional or that the agent is non-malicious. Verifiers still need to resolve the DID, validate signatures and credentials, and enforce their own policy.
Operate, rotate and recover the identity
Key rotation
Generate the replacement key in a controlled environment, publish its verification method, test signatures with relying parties, and only then retire the old key. Record the effective time and retain enough history for legitimate verification of messages signed before rotation. If the DID method supports an explicit update or version history, follow that method’s procedure rather than overwriting records informally.
Delegation
For a parent agent or operator to delegate authority, express the delegation in a credential or method-supported relationship with a clear scope and expiration. Do not give a child process the parent’s unrestricted private key. A delegated key should be independently revocable and limited to the actions it must perform.
Compromise and recovery
- Stop accepting signatures from the suspected key at the policy layer.
- Use the DID method’s recovery mechanism to publish a new authorized key.
- Revoke credentials issued to the compromised identity or deployment where necessary.
- Notify relying parties and rotate endpoint credentials that may have been exposed.
- Preserve signed audit events and a timeline of the incident.
- Re-test authentication, credential status and delegated permissions before restoring traffic.
Monitoring and audit
Monitor resolver failures, DID Document changes, endpoint changes, signature errors, nonce reuse, clock drift and credential-status failures. Retain signed events that show which key authenticated each operation, which credential supported authorization and which policy decision followed. Protect logs as sensitive data; signatures prove integrity, not that every logged action was appropriate.
Common failure modes and fixes
| Symptom | Likely cause | Corrective action |
|---|---|---|
| Verifier says the DID Document is invalid | The document’s id differs from the requested DID, or the resolver returned the wrong version. |
Check method-specific resolution, exact identifier spelling and update propagation. Reject mismatches rather than silently accepting the returned document. |
| Signature is valid but authentication fails | The key exists but is not listed for the required authentication relationship. | Add or reference the verification method under the correct relationship, then test the complete resolver-to-verifier path. |
| Requests can be replayed | The signed input lacks a nonce, timestamp, expiration, audience or body binding, or the verifier does not track them. | Add all required freshness fields, store recently used nonces for the validity window and reject stale or duplicate inputs. |
| Credential appears valid after approval was withdrawn | The verifier ignores status, revocation or expiration. | Check status on every decision or use deliberately short-lived credentials with a documented outage policy. |
| Agent identity disappears after an account loss | The DID depends on a domain, hosting account or registry key without an independent recovery plan. | Document recovery authority, maintain protected backups and rehearse replacing keys and endpoints before production. |
| Counterparty cannot resolve the identity | It does not implement the selected DID method, profile or network. | Agree on supported profiles in the integration contract, provide a compatible resolution path and define a safe failure behavior. |
Security boundaries that must remain explicit
- A DID authenticates control of a key; it is not a background check, model evaluation or guarantee of good behavior.
- A DID Document, resolver response, credential and registration file are untrusted inputs until their proofs, relationships, validity and intended audience have been checked.
- Private keys must never be supplied through prompts or placed in logs, source repositories or ordinary configuration files.
- Operator credentials, runtime signing permissions and high-impact business actions should be governed separately.
- Use scoped, short-lived credentials when a claim does not need to remain valid indefinitely.
- Design revocation and recovery before publishing the first production DID. Retrofitting them after compromise is slower and less reliable.
A practical decision checklist
Before exposing an agent to other services, verify each item:
- The controller and recovery authority are documented.
- The DID method is supported by every required counterparty.
- The private key is protected by an access-controlled signing boundary.
- The DID Document contains the exact DID as
id, an authorized authentication key and only necessary services. - Messages bind audience, nonce, timestamp, expiration and body content.
- Verifiers check the DID Document, key relationship, signature, freshness and revocation before business logic.
- Operator, capability, software and deployment claims use issuer-signed credentials.
- Credential issuer trust, subject binding, validity and status are enforced.
- Rotation, delegation, compromise and resolver-outage procedures have been tested.
- Any ERC-8004 registration is treated as a discovery aid, not as proof that the agent is safe or capable.
Where infrastructure fits
Teams that do not want to operate resolvers, DID-method hosting, credential issuance or verification code can use infrastructure services for those functions. Evaluate them on key custody, recovery controls, standards support, privacy, auditability, uptime and the ability to export identifiers and credentials. The service should reduce operational burden without becoming an undisclosed single point of control for the agent’s identity.
Bottom line
The durable pattern is straightforward: give the agent a DID, publish a precise DID Document, protect the private signing key, sign messages with explicit replay protection, and verify every interaction against the resolved document. Add credentials when you need to bind the agent to an operator, capability, software release or deployment. Consider ERC-8004 for discoverability and portability, but never confuse registry presence with proof of quality or safety.
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