2B9TObservatory

Observation schema field desk

Local record instrument

Check shape.
Demand sources.
Field
VERIFY
Cohort
0 attributable records
Schema
v2 · strict keys
Runtime
local tab only

Local validator / strict output

Check the record, not the story around it.

The validator rejects malformed JSON, missing source attribution, unexpected fields, unstable identifiers, and control assertions without referenced evidence. It makes no network request and cannot certify that pasted claims are true.

LOCAL CALIBRATION BENCHhttps://2b9t.org/schemas/observation/v2

Inspect an observation record

Paste one JSON object. This page checks it in your browser against the documented v2 shape; it does not send, retain, publish, or endorse the record.

SCHEMA / V2

Required field rail

  1. 01schemaId
  2. 02recordId
  3. 03publicationState
  4. 04subject
  5. 05observedAt
  6. 06observation
  7. 07sources
  8. 08ownershipAssertion
  9. 09lastmod
Extra fields
Rejected at their exact path
Sources
At least one attributable source
Edition
The one protocol family spoken
Control claims
Evidence-source reference required
Published records
Dated observation required
Read the complete machine contract
{
  "schemaId": "https://2b9t.org/schemas/observation/v2",
  "schemaVersion": 2,
  "inputMaxLength": 131072,
  "recordIdPattern": "^obs-[a-z0-9]+(?:-[a-z0-9]+)*-v[1-9][0-9]*$",
  "publicationStates": [
    "example",
    "draft",
    "published"
  ],
  "required": [
    "schemaId",
    "recordId",
    "publicationState",
    "subject",
    "observedAt",
    "observation",
    "sources",
    "ownershipAssertion",
    "lastmod"
  ],
  "additionalProperties": false,
  "fields": {
    "subject": {
      "required": [
        "endpoint",
        "edition"
      ],
      "editions": [
        "minecraft-java",
        "minecraft-bedrock"
      ],
      "editionRule": "edition names the status-protocol family the observation spoke; crossplay is never a record value",
      "additionalProperties": false
    },
    "observation": {
      "required": [
        "reachability",
        "returnedVersion",
        "protocol",
        "note"
      ],
      "additionalProperties": false
    },
    "sources": {
      "minItems": 1,
      "itemRequired": [
        "sourceId",
        "kind",
        "title",
        "url",
        "accessedAt"
      ],
      "itemAdditionalProperties": false,
      "kinds": [
        "direct-probe",
        "server-response",
        "owner-evidence",
        "third-party",
        "documentation"
      ]
    },
    "ownershipAssertion": {
      "nullable": true,
      "required": [
        "statement",
        "evidenceSourceId",
        "assertedAt",
        "expiresAt"
      ],
      "evidenceRule": "evidenceSourceId must reference a source whose kind is owner-evidence",
      "expiryRule": "expiresAt must be later than the UTC validation date",
      "additionalProperties": false
    }
  }
}
DOCUMENTATION EXAMPLE — NOT AN OBSERVATION

Unavailable specimen

The reserved endpoint example.invalid:25565 was not contacted. Its example state and “no endpoint request” note keep this sample out of the published cohort.

{
  "schemaId": "https://2b9t.org/schemas/observation/v2",
  "recordId": "obs-example-unavailable-v2",
  "publicationState": "example",
  "subject": {
    "endpoint": "example.invalid:25565",
    "edition": "minecraft-java"
  },
  "observedAt": null,
  "observation": {
    "reachability": "unavailable",
    "returnedVersion": null,
    "protocol": null,
    "note": "Example record only; no endpoint request was made."
  },
  "sources": [
    {
      "sourceId": "src-observation-method-v2",
      "kind": "documentation",
      "title": "2b9t observation schema and method",
      "url": "https://2b9t.org/methodology/",
      "accessedAt": "2026-08-11"
    }
  ],
  "ownershipAssertion": null,
  "lastmod": "2026-08-11"
}
PUBLISHED COHORT0 attributable records

Empty by construction. A schema-valid example is documentation, not evidence; validation never publishes a pasted record.

A VALID RESULT MEANS

The shape is inspectable

  • All required v2 keys are present and no extra key slipped through.
  • IDs, dates, timestamps, source entries, and publication state use the documented forms.
  • The declared edition is one probeable protocol family, minecraft-java or minecraft-bedrock.
  • A control assertion, when present, points to a source explicitly typed as evidence.
A VALID RESULT DOES NOT MEAN

The claims are proven

  • No endpoint is contacted and no source URL is fetched.
  • No pasted record is retained, submitted, or published.
  • No edition claim is checked against the endpoint; a Bedrock-edition record is not proof a server admits Bedrock players.
  • No identity, availability, server state, affiliation, or quality conclusion is created by validation.