{
  "$id": "EJvd1ns0KVsbB4Ji1MEv4cdq8WOSQezILlluN63K_JOH",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "title": "Foreign Artifact Affidavit",
  "description": "An ACDC wrapper that gives arbitrary binary data a tamper-evident, cryptographic identity, and that documents key attributes. This allows it to be cited as evidence in a verifiable data graph.",
  "type": "object",
  "credentialType": "foreign-artifact-affidavit",
  "version": "1.1.0",
  "required": [
    "v",
    "d",
    "i",
    "s",
    "a"
  ],
  "properties": {
    "v": {
      "description": "Version string using ACDC conventions",
      "type": "string"
    },
    "d": {
      "description": "SAID of this ACDC",
      "type": "string",
      "pattern": "^(?:[BE][A-Za-z0-9_-]{43}|0[DEFG][A-Za-z0-9_-]{86})$"
    },
    "u": {
      "description": "A salty nonce, present if the issuer wishes to blind the attributes of this ACDC",
      "type": "string"
    },
    "i": {
      "description": "AID of the issuer -- the party attesting to the artifact's integrity and provenance",
      "type": "string"
    },
    "ri": {
      "description": "Registry for issuer's credential status",
      "type": "string",
      "pattern": "^(?:[BE][A-Za-z0-9_-]{43}|0[DEFG][A-Za-z0-9_-]{86})$"
    },
    "s": {
      "description": "SAID of this schema",
      "type": "string",
      "pattern": "^(?:[BE][A-Za-z0-9_-]{43}|0[DEFG][A-Za-z0-9_-]{86})$"
    },
    "a": {
      "oneOf": [
        {
          "description": "SAID of attributes block (compact form)",
          "type": "string"
        },
        {
          "description": "Attributes block",
          "$id": "ELvaIX-aUWBjGThCoYSPtB-vUbVp53Tv_zFYoUNZLL6O",
          "type": "object",
          "required": [
            "d",
            "art_digest",
            "art_posture"
          ],
          "properties": {
            "d": {
              "description": "SAID of attributes block",
              "type": "string",
              "pattern": "^(?:[BE][A-Za-z0-9_-]{43}|0[DEFG][A-Za-z0-9_-]{86})$"
            },
            "u": {
              "description": "A salty nonce",
              "type": "string"
            },
            "dt": {
              "description": "Issuance datetime, ISO 8601",
              "type": "string",
              "format": "date-time"
            },
            "art_digest": {
              "description": "A CESR-encoded cryptographic hash of the artifact. SHOULD be a SAID; see https://doi.org/10.2139/ssrn.6128466 for saidification options. MAY be a raw CESR hash if saidification is impractical.",
              "type": "string",
              "pattern": "^(?:[EFGHI][A-Za-z0-9_-]{43}|0[DEFG][A-Za-z0-9_-]{86})$",
              "examples": [
                "EK2r6EnDXre2pecTBO8s99j4OtNaaDIhVyr7uGugDhmp"
              ]
            },
            "art_posture": {
              "description": "Posture of the issuer with respect to the artifact. Must be one of: 'record' (record the artifact's identifer without necessarily seeing the artifact), 'witness' (witness the artifact and compute art_digest from it), or 'verify' (verify the artifact according to its native rules).",
              "type": "string",
              "enum": [
                "record",
                "witness",
                "verify"
              ]
            },
            "rev_latency": {
              "description": "Assertion that the issuer makes about how quickly it will revoke this ACDC if its corresponding artifact is revoked. A non-negative integer measuring seconds of elapsed time between the artifact revocation and its subsequent ACDC revocation. The most common value is 0, meaning the artifact has no revocation semantics, and/or the issuer takes no responsibility for keeping the ACDC's revocation aligned with the artifact's. When the artifact is a foreign credential type, and the FAA issuer acts as a bridge, this field allows an indirect revocation test of the foreign value, if the issuer is trusted.",
              "type": "integer",
              "minimum": 0
            },
            "content_type": {
              "description": "MIME type of the artifact, per IANA media type registry. Although 'application/octet-stream' is valid, overly generic types are discouraged because the limit low-context data processing.",
              "type": "string",
              "pattern": "^[a-z]+/[a-z0-9][a-z0-9._+-]*$",
              "examples": [
                "image/jpeg",
                "application/pdf",
                "audio/mpeg",
                "application/octet-stream",
                "text/plain"
              ]
            },
            "content_size": {
              "description": "Size of the artifact in bytes. Allows a recipient to anticipate transfer costs before retrieving the artifact.",
              "type": "integer",
              "minimum": 0
            },
            "content_location": {
              "description": "One or more URIs from which the artifact may be retrieved. Multiple URIs may reflect redundant hosting, different transport protocols, or different access tiers (e.g., a public CDN and an authenticated endpoint). The presence of this field does not guarantee availability; it is informational. However, use of data:// URIs is supported and allows direct embedding of the content.",
              "oneOf": [
                {
                  "type": "string",
                  "format": "uri"
                },
                {
                  "type": "array",
                  "minItems": 1,
                  "uniqueItems": true,
                  "items": {
                    "type": "string",
                    "format": "uri"
                  }
                }
              ]
            },
            "filename": {
              "description": "The original filename of the artifact at the time of wrapping. For artifacts using the externalized SAID algorithm (xSAID), this field SHOULD reflect the saidified filename including the embedded SAID.",
              "type": "string"
            },
            "description": {
              "description": "A human-readable description of the artifact's content or significance. Not intended for machine interpretation.",
              "type": "string"
            },
            "provenance": {
              "description": "A human-readable statement of how the artifact was obtained or created \u2014 for example, 'Captured by device AID EX... at 2025-03-01T09:00:00Z', 'Downloaded from https://...', or 'Received via email from ...'. For machine-verifiable provenance, use an ACDC edge instead.",
              "type": "string"
            }
          },
          "additionalProperties": true
        }
      ]
    },
    "r": {
      "oneOf": [
        {
          "description": "Rules section SAID (compact form)",
          "type": "string"
        },
        {
          "description": "Rules detail",
          "type": "object",
          "properties": {
            "d": {
              "description": "SAID of rules block",
              "type": "string"
            }
          },
          "additionalProperties": true
        }
      ]
    }
  },
  "additionalProperties": true
}