com.linkedclaims.claim

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A verifiable claim about any URI-addressable subject.

main record

A verifiable claim about any URI-addressable subject.

Record Key tid Timestamp-based ID

Properties

aspect string Optional

The specific aspect being rated or assessed (e.g., quality, reliability, timeliness).

claimType string Required

Category of claim. Open vocabulary — common values include skill, credential, impact, endorsement, dispute, rating, review, membership, supersedes, revocation.

claimUri string uri Optional

Persistent URI identity of this claim per the DIF Labs LinkedClaims spec. This is how other claims reference this one (by using this URI as their subject). May be an AT-URI if the claim originated on ATProto, or an HTTPS URL or other URI if it originated elsewhere. Must be a well-formed, persistent, dereferenceable URI.

confidence string Optional

Signer's confidence in this claim (0-1).

minimum: 0maximum: 1

createdAt string datetime Required

When this record was created.

effectiveDate string datetime Optional

When the claim became/becomes true (may differ from createdAt).

embeddedProof ref #embeddedProof Optional

For claims signed by external methods (MetaMask, aca-py, Digital Bazaar, etc.) before being published to ATProto. Preserves the original signer identity when the ATProto repo owner differs from the claim signer.

evidence array of ref #evidenceItem Optional

Supporting materials provided to back up this claim — photos, videos, screenshots, documents, links. For example: source might be a Wikipedia article, evidence is the screenshot you took of it. Source might be you (first-hand), evidence is the video you recorded. Each item has a URI and optionally a content hash for integrity.

object string Optional

Optional object of the claim (e.g., skill name, credential type, rating category).

respondAt string uri Optional

URI where endorsements, disputes, or other responses to this claim may be sent. Per the LinkedClaims spec, MAY behave like an ActivityPub inbox.

source ref #claimSource Optional

Where this claim comes from — a person, a website, a document. For example: 'I saw this on Wikipedia' (source.uri = the Wikipedia URL), or 'My colleague told me' (source.uri = their DID, howKnown = SECOND_HAND). Source is not evidence — it's the origin of the information.

stars integer Optional

Star rating (for rating-type claims).

minimum: 1maximum: 5

statement string Optional

Human-readable explanation of the claim.

maxLength: 10000 bytes

subject string uri Required

The entity this claim is about. Can be any URI: HTTPS URL, DID, AT-URI, IPFS CID, or another claim's claimUri (for claims-about-claims such as endorsements or disputes).

View raw schema

{
  "key": "tid",
  "type": "record",
  "record": {
    "type": "object",
    "required": [
      "subject",
      "claimType",
      "createdAt"
    ],
    "properties": {
      "stars": {
        "type": "integer",
        "maximum": 5,
        "minimum": 1,
        "description": "Star rating (for rating-type claims)."
      },
      "aspect": {
        "type": "string",
        "description": "The specific aspect being rated or assessed (e.g., quality, reliability, timeliness)."
      },
      "object": {
        "type": "string",
        "description": "Optional object of the claim (e.g., skill name, credential type, rating category)."
      },
      "source": {
        "ref": "#claimSource",
        "type": "ref",
        "description": "Where this claim comes from — a person, a website, a document. For example: 'I saw this on Wikipedia' (source.uri = the Wikipedia URL), or 'My colleague told me' (source.uri = their DID, howKnown = SECOND_HAND). Source is not evidence — it's the origin of the information."
      },
      "subject": {
        "type": "string",
        "format": "uri",
        "description": "The entity this claim is about. Can be any URI: HTTPS URL, DID, AT-URI, IPFS CID, or another claim's claimUri (for claims-about-claims such as endorsements or disputes)."
      },
      "claimUri": {
        "type": "string",
        "format": "uri",
        "description": "Persistent URI identity of this claim per the DIF Labs LinkedClaims spec. This is how other claims reference this one (by using this URI as their subject). May be an AT-URI if the claim originated on ATProto, or an HTTPS URL or other URI if it originated elsewhere. Must be a well-formed, persistent, dereferenceable URI."
      },
      "evidence": {
        "type": "array",
        "items": {
          "ref": "#evidenceItem",
          "type": "ref"
        },
        "description": "Supporting materials provided to back up this claim — photos, videos, screenshots, documents, links. For example: source might be a Wikipedia article, evidence is the screenshot you took of it. Source might be you (first-hand), evidence is the video you recorded. Each item has a URI and optionally a content hash for integrity."
      },
      "claimType": {
        "type": "string",
        "description": "Category of claim. Open vocabulary — common values include skill, credential, impact, endorsement, dispute, rating, review, membership, supersedes, revocation."
      },
      "createdAt": {
        "type": "string",
        "format": "datetime",
        "description": "When this record was created."
      },
      "respondAt": {
        "type": "string",
        "format": "uri",
        "description": "URI where endorsements, disputes, or other responses to this claim may be sent. Per the LinkedClaims spec, MAY behave like an ActivityPub inbox."
      },
      "statement": {
        "type": "string",
        "maxLength": 10000,
        "description": "Human-readable explanation of the claim."
      },
      "confidence": {
        "type": "string",
        "maximum": 1,
        "minimum": 0,
        "description": "Signer's confidence in this claim (0-1)."
      },
      "effectiveDate": {
        "type": "string",
        "format": "datetime",
        "description": "When the claim became/becomes true (may differ from createdAt)."
      },
      "embeddedProof": {
        "ref": "#embeddedProof",
        "type": "ref",
        "description": "For claims signed by external methods (MetaMask, aca-py, Digital Bazaar, etc.) before being published to ATProto. Preserves the original signer identity when the ATProto repo owner differs from the claim signer."
      }
    }
  },
  "description": "A verifiable claim about any URI-addressable subject."
}

claimSource object

Where this claim comes from. A source can be a person (DID, URL), a website, a document, or any URI-addressable origin. Based on the cooperation.org/credentials/v1 ClaimSource vocabulary.

Properties

author string uri Optional

Original author of the evidence (if different from claim signer).

curator string uri Optional

Entity that curated/surfaced this evidence.

dateObserved string datetime Optional

When the evidence was observed/collected.

digestMultibase string Optional

Multibase-encoded hash of the evidence content for integrity verification, per W3C VC Data Model 2.0 (e.g., zQm...).

howKnown string Optional

How the signer knows this claim to be true.

Known values: FIRST_HAND, SECOND_HAND, WEB_DOCUMENT, VERIFIED_LOGIN, SIGNED_DOCUMENT, BLOCKCHAIN, RESEARCH, OPINION, OTHER

uri string uri Optional

URI of the evidence (HTTPS URL, IPFS CID, AT-URI, etc.).

View raw schema

{
  "type": "object",
  "properties": {
    "uri": {
      "type": "string",
      "format": "uri",
      "description": "URI of the evidence (HTTPS URL, IPFS CID, AT-URI, etc.)."
    },
    "author": {
      "type": "string",
      "format": "uri",
      "description": "Original author of the evidence (if different from claim signer)."
    },
    "curator": {
      "type": "string",
      "format": "uri",
      "description": "Entity that curated/surfaced this evidence."
    },
    "howKnown": {
      "type": "string",
      "description": "How the signer knows this claim to be true.",
      "knownValues": [
        "FIRST_HAND",
        "SECOND_HAND",
        "WEB_DOCUMENT",
        "VERIFIED_LOGIN",
        "SIGNED_DOCUMENT",
        "BLOCKCHAIN",
        "RESEARCH",
        "OPINION",
        "OTHER"
      ]
    },
    "dateObserved": {
      "type": "string",
      "format": "datetime",
      "description": "When the evidence was observed/collected."
    },
    "digestMultibase": {
      "type": "string",
      "description": "Multibase-encoded hash of the evidence content for integrity verification, per W3C VC Data Model 2.0 (e.g., zQm...)."
    }
  },
  "description": "Where this claim comes from. A source can be a person (DID, URL), a website, a document, or any URI-addressable origin. Based on the cooperation.org/credentials/v1 ClaimSource vocabulary."
}

embeddedProof object

Cryptographic proof from external signing methods. Allows claims signed via MetaMask, aca-py, Digital Bazaar, etc. to be published on ATProto while preserving the original signer identity.

Properties

created string datetime Required

When the signature was created.

proofPurpose string Optional

Purpose of the proof (typically assertionMethod for claims).

proofValue string Required

The signature value (format depends on type).

type string Required

Signature suite type (e.g., EthereumEip712Signature2021, Ed25519Signature2020, JsonWebSignature2020).

verificationMethod string Required

DID or key identifier of the actual claim signer (e.g., did:pkh:eip155:1:0xABC..., did:key:z6Mk..., did:web:example.com).

View raw schema

{
  "type": "object",
  "required": [
    "type",
    "verificationMethod",
    "proofValue",
    "created"
  ],
  "properties": {
    "type": {
      "type": "string",
      "description": "Signature suite type (e.g., EthereumEip712Signature2021, Ed25519Signature2020, JsonWebSignature2020)."
    },
    "created": {
      "type": "string",
      "format": "datetime",
      "description": "When the signature was created."
    },
    "proofValue": {
      "type": "string",
      "description": "The signature value (format depends on type)."
    },
    "proofPurpose": {
      "type": "string",
      "default": "assertionMethod",
      "description": "Purpose of the proof (typically assertionMethod for claims)."
    },
    "verificationMethod": {
      "type": "string",
      "description": "DID or key identifier of the actual claim signer (e.g., did:pkh:eip155:1:0xABC..., did:key:z6Mk..., did:web:example.com)."
    }
  },
  "description": "Cryptographic proof from external signing methods. Allows claims signed via MetaMask, aca-py, Digital Bazaar, etc. to be published on ATProto while preserving the original signer identity."
}

evidenceItem object

A piece of supporting material for a claim — a photo, video, screenshot, document, or link. Evidence is what backs up the claim; source is where the claim comes from.

Properties

description string Optional

What this evidence shows or contains.

maxLength: 1000 bytes

digestMultibase string Optional

Multibase-encoded hash of the content for integrity verification (e.g., zQm...).

mediaType string Optional

MIME type of the evidence (e.g., image/jpeg, video/mp4, application/pdf).

uri string uri Optional

URI of the evidence (HTTPS URL, IPFS CID, AT-URI, blob reference, etc.).

View raw schema

{
  "type": "object",
  "properties": {
    "uri": {
      "type": "string",
      "format": "uri",
      "description": "URI of the evidence (HTTPS URL, IPFS CID, AT-URI, blob reference, etc.)."
    },
    "mediaType": {
      "type": "string",
      "description": "MIME type of the evidence (e.g., image/jpeg, video/mp4, application/pdf)."
    },
    "description": {
      "type": "string",
      "maxLength": 1000,
      "description": "What this evidence shows or contains."
    },
    "digestMultibase": {
      "type": "string",
      "description": "Multibase-encoded hash of the content for integrity verification (e.g., zQm...)."
    }
  },
  "description": "A piece of supporting material for a claim — a photo, video, screenshot, document, or link. Evidence is what backs up the claim; source is where the claim comes from."
}