Schema reference

`origin.schema.json`

The origin predicate. Source claims, event identity and time, and the exact subjects first observed.

Title: Makoto v0.2 Origin Predicate
Identifier: https://usemakoto.dev/schema/v0.2/origin.schema.json
Digest: sha256:3f56d68d758bb72c2bcbabd922e1ac7d6eb6dd9c3e6baa78a9f104cf0a64badc
Raw: /schema/v0.2/origin.schema.json
Carried in: The predicate of a statement whose predicateType is https://usemakoto.dev/predicate/v0.2/origin.
Responsibility: Common event fields plus source fields and prohibition of predecessors.

A real instance. Read from

demos/end-to-end/artifacts/positive-bundle/attestations/56b7be4394fe09c62ec7a3d5763cecc251e9696f267f35b2acc717b0d170a27a.dsse.json → predicate

, which validates against this schema.

{
  "event": {
    "id": "urn:uuid:11111111-1111-4111-8111-111111111111",
    "occurredAt": "2026-09-16T16:00:00Z"
  },
  "profiles": [],
  "schemaVersion": "0.2",
  "source": {
    "kind": "urn:makoto:demo:source:synthetic-file",
    "uri": "urn:makoto:demo:v0.2:source:customers-raw"
  }
}

Referenced by

statement.schema.json → predicate

Fields

Top level timestamp event source extensions

Top level#

Shape object

closed object

Field	Type	Constraints, rules, and a real value
schemaVersion required	string constant	= "0.2" Makoto predicate version. `"0.2"`
event required	event	`{"id": "urn:uuid:11111111-1111-4111-8111-111111111111", "occurredAt": "2026-09-16T16:00:00Z"}`
source required	source	`{"kind": "urn:makoto:demo:source:synthetic-file", "uri": "urn:makoto:demo:v0.2:source:customers…`
profiles optional	array of profile-reference.schema.json	Additional schemas to apply. `[]`
extensions optional	extensions	URI-namespaced extension values.

timestamp#

Shape string

min length 20
max length 30

Appears at event.occurredAt, source.retrievedAt

event#

Shape object

closed object

Appears at event

Field	Type	Constraints, rules, and a real value
id required	string	min length 1 max length 4096 Producer-selected event identifier; uniqueness is enforced across the verified graph. `"urn:uuid:11111111-1111-4111-8111-111111111111"`
occurredAt required	timestamp	Signer-asserted event time; not a trusted timestamp unless policy adds that guarantee. `"2026-09-16T16:00:00Z"`

source#

Shape object

closed object

Appears at source

Field	Type	Constraints, rules, and a real value
kind required	string	min length 1 max length 4096 Machine-readable source category. `"urn:makoto:demo:source:synthetic-file"`
uri optional	string	min length 1 max length 4096 Source locator. It may be omitted or redacted for privacy; an empty string is invalid when the member is present. `"urn:makoto:demo:v0.2:source:customers-raw"`
name optional	string	max length 4096 Human-readable source name.
mediaType optional	string	max length 255 Media type observed at collection.
retrievedAt optional	timestamp	Time the producer retrieved or observed the source.
version optional	string	max length 4096 Source-controlled version or revision.

extensions#

Shape object

Appears at extensions

Real documents that validate

demos/end-to-end/artifacts/positive-bundle/attestations/56b7be4394fe09c62ec7a3d5763cecc251e9696f267f35b2acc717b0d170a27a.dsse.json → predicate

Raw JSON

The published document (1,643 bytes)

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://usemakoto.dev/schema/v0.2/origin.schema.json",
  "title": "Makoto v0.2 Origin Predicate",
  "type": "object",
  "required": ["schemaVersion", "event", "source"],
  "properties": {
    "schemaVersion": { "const": "0.2" },
    "event": { "$ref": "#/$defs/event" },
    "source": { "$ref": "#/$defs/source" },
    "profiles": {
      "type": "array",
      "items": { "$ref": "https://usemakoto.dev/schema/v0.2/profile-reference.schema.json" }
    },
    "extensions": { "$ref": "#/$defs/extensions" }
  },
  "$defs": {
    "timestamp": {
      "type": "string",
      "minLength": 20,
      "maxLength": 30
    },
    "event": {
      "type": "object",
      "required": ["id", "occurredAt"],
      "properties": {
        "id": { "type": "string", "minLength": 1, "maxLength": 4096 },
        "occurredAt": { "$ref": "#/$defs/timestamp" }
      },
      "additionalProperties": false
    },
    "source": {
      "type": "object",
      "required": ["kind"],
      "properties": {
        "kind": { "type": "string", "minLength": 1, "maxLength": 4096 },
        "uri": { "type": "string", "minLength": 1, "maxLength": 4096 },
        "name": { "type": "string", "maxLength": 4096 },
        "mediaType": {
          "type": "string",
          "maxLength": 255
        },
        "retrievedAt": { "$ref": "#/$defs/timestamp" },
        "version": { "type": "string", "maxLength": 4096 }
      },
      "additionalProperties": false
    },
    "extensions": {
      "type": "object",
      "additionalProperties": true
    }
  },
  "additionalProperties": false
}

The published bytes, unmodified.