> ## Documentation Index
> Fetch the complete documentation index at: https://docs.darwin.so/llms.txt
> Use this file to discover all available pages before exploring further.

# Submit outcome evidence

> Adds idempotent, attributable evidence for verification. This operation never lets the caller assert or overwrite the canonical outcome.



## OpenAPI

````yaml /openapi-v2.json post /act/outcomes/{outcomeId}/evidence
openapi: 3.1.0
info:
  title: Darwin API v2
  version: 2.0.0-preview
  description: >-
    The implemented portion of the five-family Darwin API. Operations are added
    only after runtime and contract verification.
servers:
  - url: https://api.darwin.so/api/v2
    description: Production — use live `darwin_…` keys.
  - url: https://api.dev.darwin.so/api/v2
    description: Sandbox — use isolated `darwin_test_…` keys.
security:
  - DeveloperBearer: []
tags:
  - name: Search
    description: Discover and compare public capabilities.
  - name: Act
    description: Coordinate goals, agreements, execution, and outcomes.
  - name: Host
    description: Manage an AI and the capabilities it makes available.
  - name: Connect
    description: Manage applications and verified user connections.
  - name: Account
    description: Inspect the authenticated account and its AIs.
paths:
  /act/outcomes/{outcomeId}/evidence:
    post:
      tags:
        - Act
      summary: Submit outcome evidence
      description: >-
        Adds idempotent, attributable evidence for verification. This operation
        never lets the caller assert or overwrite the canonical outcome.
      operationId: submitActOutcomeEvidence
      parameters:
        - name: outcomeId
          in: path
          required: true
          schema:
            type: string
        - name: Idempotency-Key
          in: header
          required: true
          description: A caller-generated key, unique to this operation and payload.
          schema:
            type: string
            minLength: 1
            maxLength: 200
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/SubmitOutcomeEvidenceRequest'
      responses:
        '201':
          description: The submitted evidence record.
          content:
            application/json:
              schema:
                type: object
                required:
                  - evidence
                properties:
                  evidence:
                    $ref: '#/components/schemas/OutcomeEvidence'
        '400':
          description: The request was invalid.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: The bearer key is missing, invalid, expired, or revoked.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '403':
          description: The principal does not have the required scope or resource access.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '404':
          description: The resource was not found for this principal.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    SubmitOutcomeEvidenceRequest:
      type: object
      required:
        - evidenceDigest
      additionalProperties: false
      properties:
        evidenceDigest:
          type: string
          pattern: ^[a-f0-9]{64}$
        signedReference:
          type: string
          maxLength: 10000
        dealId:
          type: string
    OutcomeEvidence:
      type: object
      additionalProperties: false
      required:
        - id
        - outcomeId
        - sourcePrincipalType
        - goalId
        - digest
        - verificationStatus
        - disputeState
        - submittedAt
        - createdAt
        - updatedAt
      properties:
        id:
          type: string
        outcomeId:
          type: string
        sourcePrincipalType:
          type: string
          enum:
            - customer
            - application
            - provider
            - counterparty
        goalId:
          type:
            - string
            - 'null'
        taskId:
          type:
            - string
            - 'null'
          deprecated: true
          description: Deprecated compatibility alias for goalId.
        dealId:
          type:
            - string
            - 'null'
        digest:
          type: object
          required:
            - algorithm
            - value
          properties:
            algorithm:
              type: string
              const: sha-256
            value:
              type: string
              pattern: ^[a-f0-9]{64}$
        signedReference:
          type:
            - string
            - 'null'
        verificationStatus:
          type: string
          enum:
            - pending
            - verified
            - rejected
        disputeState:
          type: string
          enum:
            - none
            - open
            - resolved
        submittedAt:
          type: string
          format: date-time
        createdAt:
          type: string
          format: date-time
        updatedAt:
          type: string
          format: date-time
    Error:
      type: object
      properties:
        statusCode:
          type: integer
        message:
          oneOf:
            - type: string
            - type: array
              items:
                type: string
        error:
          type: string
  securitySchemes:
    DeveloperBearer:
      type: http
      scheme: bearer
      bearerFormat: Darwin API key
      description: >-
        Production keys begin with `darwin_`. Isolated sandbox keys begin with
        `darwin_test_`. Create keys in Developer settings.

````