> ## Documentation Index > Fetch the complete documentation index at: https://quantura.mintlify.site/llms.txt > Use this file to discover all available pages before exploring further. # Verify forecast receipt > Default response is the exact canonical UTF-8 manifest committed by SHA3-256, including a private random nonce, forecast values, input cutoff and generation time. Keep these bytes unchanged when verifying. X-VBase-Content-CID identifies the committed bytes. verify=true recomputes the saved content CID and looks up the stamp in Quantura's vBase collection/account, returning content_matches, stamp_found and verified_at in the data envelope. format=envelope returns manifest_utf8 and provenance for authenticated browser downloads. Receipt verification proves content/time, not accuracy or prospective publication before the stamp time. Reads do not create stamps or write Firestore documents. ## OpenAPI ````yaml /docs/api/openapi.json get /v1/ensemble-forecasts/{forecast_id}/proof openapi: 3.1.0 info: title: Quantura API version: 1.0.0 description: >- Search markets and public datasets, download historical observations, create forecasts and inspect screener quantiles. contact: name: Quantura url: https://quantura.studio/contact license: name: Quantura API Terms url: https://quantura.studio/terms servers: - url: https://quantura.studio/api security: - bearerAuth: [] - clerkOAuth: - openid - profile - email tags: - name: Access - name: Forecast - name: Screener - name: Search - name: Download - name: Scout paths: /v1/ensemble-forecasts/{forecast_id}/proof: servers: - url: https://quantura.studio/api get: tags: - Forecast summary: Verify forecast receipt description: >- Default response is the exact canonical UTF-8 manifest committed by SHA3-256, including a private random nonce, forecast values, input cutoff and generation time. Keep these bytes unchanged when verifying. X-VBase-Content-CID identifies the committed bytes. verify=true recomputes the saved content CID and looks up the stamp in Quantura's vBase collection/account, returning content_matches, stamp_found and verified_at in the data envelope. format=envelope returns manifest_utf8 and provenance for authenticated browser downloads. Receipt verification proves content/time, not accuracy or prospective publication before the stamp time. Reads do not create stamps or write Firestore documents. operationId: getEnsembleForecastProof parameters: - name: forecast_id in: path required: true schema: type: string - name: verify in: query schema: type: boolean default: false - name: format in: query schema: type: string enum: - manifest - envelope default: manifest responses: '200': description: Exact manifest attachment, or JSON verification/download envelope. headers: X-VBase-Content-CID: schema: type: string pattern: ^0x[0-9a-f]{64}$ content: application/json: schema: type: object properties: schema_version: const: quantura_forecast_proof_v1 nonce: type: string forecast_id: type: string generated_at: type: string format: date-time input_cutoff_at: type: - string - 'null' format: date-time output: type: object data: type: object properties: content_matches: type: boolean stamp_found: type: boolean verified_at: type: string format: date-time manifest_utf8: type: string provenance: $ref: '#/components/schemas/ForecastTimestampReceipt' example: schema_version: quantura_forecast_proof_v1 nonce: >- eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee forecast_id: example generated_at: '2026-10-09T14:17:00Z' input_cutoff_at: '2026-10-08T20:00:00Z' source: type: ticker provider: alpaca symbol: SPY configuration: frequency: 1D quantiles: - 0.1 - 0.5 - 0.9 model_checkpoints: {} model_revisions: {} output: predictions: - timestamp: '2026-10-09T20:00:00Z' quantiles: '0.1': 100 '0.5': 110 '0.9': 120 '401': description: Authentication required. '403': description: Forecast scope, membership or resource permission denied. '404': description: Forecast not found. '409': description: Completed timestamp receipt not yet available. '503': description: >- Receipt service unavailable. Forecast remains available; retries are bounded. security: - bearerAuth: [] - clerkOAuth: - openid - profile - email components: schemas: ForecastTimestampReceipt: type: - object - 'null' properties: provider: const: vbase schema_version: const: quantura_forecast_proof_v1 status: type: string enum: - pending - stamping - stamped - unavailable content_cid: type: - string - 'null' pattern: ^0x[0-9a-f]{64}$ receipt: type: - object - 'null' properties: object_cid: type: string pattern: ^0x[0-9a-f]{64}$ set_cid: type: string pattern: ^0x[0-9a-f]{64}$ transaction_hash: type: string pattern: ^0x[0-9a-f]{64}$ user_address: type: - string - 'null' user_label: type: string description: >- Account display name returned during recovery, not a blockchain address. chain_id: type: integer timestamp: type: string format: date-time error_code: type: - string - 'null' securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: Clerk personal API key or legacy Quantura key clerkOAuth: type: oauth2 description: >- Clerk authorization code with PKCE S256. Pass resource=https://quantura.studio on authorization and token requests. Paid Pro, enterprise or verified administrator API access is required. flows: authorizationCode: authorizationUrl: https://clerk.quantura.studio/oauth/authorize tokenUrl: https://clerk.quantura.studio/oauth/token refreshUrl: https://clerk.quantura.studio/oauth/token scopes: openid: Identify the Quantura account profile: Resolve the account profile email: Verify account email offline_access: Refresh access after expiry ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.