> ## Documentation Index > Fetch the complete documentation index at: https://docs.sharedgraph.com/llms.txt > Use this file to discover all available pages before exploring further. # Read the current publication stamp > The incarnation, witness epoch and revision as of now, without any credential and without reading domain data. An application boundary that already holds a protected read confirms with this that no restriction (a confirmed delete, block, suspension or recovery) moved the witness epoch or incarnation after that read was admitted, before it publishes the read to its own user. The same three values are also stamped as headers on every protected read. ## OpenAPI ````yaml /openapi.json get /api/publication openapi: 3.1.0 info: title: SharedGraph public application API version: pilot description: >- Pilot: breaking changes are possible and announced in the changelog. SharedGraph is a common social network used through independently operated applications. Supported integration: server-backed confidential OAuth client using authorization code with S256 PKCE. Anonymous public reads are a pilot convenience: 120 requests/minute per connecting address, with a tighter shared 30/minute events+reconcile budget. Signed-in views must preserve bearer safety rules and never fall back to anonymous after a refusal. No account-management, moderator, operator, registration or debug API is part of this reference. Provider browser helpers use account cookies; token endpoints use Basic; social private reads and mutations use bearer. x-app-generation is an application BFF session signal, not a core response header. Error catalog below records the pilot domain and OAuth protocol refusals; provider error descriptions are diagnostic text, not a stable machine identifier. servers: - url: https://api.sharedgraph.com description: Hosted pilot network security: - BearerAuth: [] tags: - name: Social - name: OAuth - name: Discovery paths: /api/publication: get: tags: - Social summary: Read the current publication stamp description: >- The incarnation, witness epoch and revision as of now, without any credential and without reading domain data. An application boundary that already holds a protected read confirms with this that no restriction (a confirmed delete, block, suspension or recovery) moved the witness epoch or incarnation after that read was admitted, before it publishes the read to its own user. The same three values are also stamped as headers on every protected read. operationId: get_api_publication responses: '200': description: Successful response content: application/json: schema: $ref: '#/components/schemas/PublicationStamp' headers: x-sharedgraph-revision: description: >- SQL admission revision for protected domain reads; absent on many errors and OAuth/mutation responses. schema: type: string pattern: ^[0-9]+$ x-sharedgraph-incarnation: description: >- Recovery incarnation; revalidate and retire a session if it changes. schema: type: string x-sharedgraph-witness-epoch: description: Independent witness epoch at read admission. schema: type: string pattern: ^[0-9]+$ '400': description: Refusal; see the error catalog. content: application/json: schema: $ref: '#/components/schemas/Error' '405': description: Refusal; see the error catalog. content: application/json: schema: $ref: '#/components/schemas/Error' '429': description: Refusal; see the error catalog. content: application/json: schema: $ref: '#/components/schemas/Error' '500': description: Refusal; see the error catalog. content: application/json: schema: $ref: '#/components/schemas/Error' '503': description: Refusal; see the error catalog. content: application/json: schema: $ref: '#/components/schemas/Error' security: [] components: schemas: PublicationStamp: type: object description: >- The network's current publication stamp: the recovery incarnation and witness epoch every protected read is admitted under, and the SQL revision at the moment of this read. properties: incarnation: type: string minLength: 1 witnessEpoch: type: integer minimum: 1 revision: type: integer minimum: 0 required: - incarnation - witnessEpoch - revision additionalProperties: false Error: type: object properties: error: type: string minLength: 1 enum: - unknown_or_immutable_field - invalid_text - invalid_json - intent_required - unsupported_audience - invalid_parent - revision_required - self_relation - self_block - invalid_report - invalid_cursor - authentication_required - auth_unavailable - authority_unavailable - capability_required - not_owner - interaction_unavailable - social_authority_required - not_found - intent_conflict - revision_conflict - post_deleted - post_unavailable - parent_unavailable - effect_mismatch - domain_plan_too_large - publishing_paused - pilot_rate_limited - protected_read_unavailable - protected_read_storage_unavailable - recovery_unavailable - domain_storage_unavailable - pilot_storage_unavailable - pilot_limits_unavailable - trusted_address_unavailable - origin_required - origin_mismatch - restriction_witness_required - restriction_witness_unavailable_or_incomplete - recovery_state_missing - recovery_publication_changed - recovery_quarantined - lifecycle_revision_conflict - witness_prepare_mismatch - ambiguous_acceptance_requires_independent_proof - witness_acceptance_mismatch - witness_finalize_unconfirmed - invalid_request - invalid_client - invalid_grant - invalid_scope - unsupported_grant_type - unsupported_response_type - access_denied - temporarily_unavailable - server_error - invalid_token - unsupported_token_type - invalid_target - invalid_signature - invalid_redirect_uri - invalid_request_uri - request_not_supported - request_uri_not_supported - login_required - interaction_required - account_selection_required - consent_required message: type: string error_description: type: string error_uri: type: string format: uri required: - error additionalProperties: false securitySchemes: BearerAuth: type: http scheme: bearer description: >- Audited access token bound to the current application, actor and immutable grant. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.