Read an external timestamp receipt

get_evidence_anchor Read a portable external timestamp receipt for a link, target or citation observation. Verification is pinned to FreeTSA; online revocation is not checked. No witness request occurs on read.

Name recorded in the 2026-10-27 deployment. This page describes current source; verify inputs and access in your connected catalog. Provider configuration and workspace access still apply.

Access	Behavior
`watches:read`	Reads saved data

This read does not start a verification job.

Example request

Connect through MCP, CLI, or HTTP. Replace example identifiers with records from your workspace.

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "get_evidence_anchor",
    "arguments": {
      "subject": "citation",
      "observationId": "cio_example"
    }
  }
}

agentlinkops call get_evidence_anchor --args '{"subject":"citation","observationId":"cio_example"}'

curl --fail-with-body https://app.agentlinkops.com/v1/commands/get_evidence_anchor \
  -H "Authorization: Bearer $AGENTLINKOPS_TOKEN" \
  -H 'Content-Type: application/json' \
  --data '{"subject":"citation","observationId":"cio_example"}'

Returned result

Schema-validated example; IDs and dates are illustrative. MCP returns this data in structuredContent and in a text content block; generic HTTP and CLI return the JSON result directly.

{
  "id": "anc_example",
  "workspace_id": "workspace_example",
  "project_id": "project_example",
  "subject": "citation",
  "observation_id": "cio_example",
  "digest": "0000000000000000000000000000000000000000000000000000000000000000",
  "status": "pending",
  "attempts": 1,
  "created_at": "2026-09-20T00:00:00.000Z",
  "last_error": null,
  "queryBase64": null,
  "responseBase64": null,
  "verification": null
}

Input fields

Omit optional fields when you do not want to supply them. Null is accepted only where listed. Unknown input properties are rejected.

Field	Type	Presence	Meaning and constraints
`subject`	string	Required	values: `"link"`, `"target"`, `"citation"`
`observationId`	string	Required	ID of a saved observation; this does not fetch a new publisher page. minLength: `1`; maxLength: `200`

Validation and omitted values

Only an explicit anchor request contacts the fixed FreeTSA authority, transmitting a digest and nonce. Portable RFC3161 receipts are verified against a pinned certificate; trust in the authority clock/key remains explicit and online revocation is not checked. The receipt proves existence no later than the signed timestamp, not the original observation time or provider authenticity. A failed or pending request is not an anchor.

Output fields

Fields inside optional or nullable parents apply only when that parent exists. Common schema conventions explain evidence states, empty lists and extensions.

id (string, required): Resource identifier returned by the operation.
workspace_id (string, required): Workspace that owns this record.
project_id (string, required): Project that owns this record.
subject (string, required).
observation_id (string, required): Identifier returned by the related operation.
digest (string, required).
status (string, required): Resource lifecycle status.
attempts (integer, required): Attempts recorded for this operation.
created_at (string, required): UTC timestamp when the record was created.
last_error (string / null, required).
queryBase64 (string / null, required).
responseBase64 (string / null, required).
verification (object / null, required).

All fields and nested objects

Types, allowed values, limits and nested fields:

Field	Type	Presence	Meaning and constraints
`id`	string	Required	Resource identifier returned by the operation. minLength: `1`; maxLength: `200`
`workspace_id`	string	Required	Workspace that owns this record. minLength: `1`; maxLength: `200`
`project_id`	string	Required	Project that owns this record. minLength: `1`; maxLength: `200`
`subject`	string	Required	values: `"link"`, `"target"`, `"citation"`
`observation_id`	string	Required	Identifier returned by the related operation. minLength: `1`; maxLength: `200`
`digest`	string	Required	pattern: `"^[a-f0-9]{64}$"`
`status`	string	Required	Resource lifecycle status. values: `"pending"`, `"verified"`, `"failed"`
`attempts`	integer	Required	Attempts recorded for this operation. minimum: `-9007199254740991`; maximum: `9007199254740991`
`created_at`	string	Required	UTC timestamp when the record was created.
`last_error`	string / null	Required
`queryBase64`	string / null	Required
`responseBase64`	string / null	Required
`verification`	object / null	Required
`verification.verified`	boolean	Required	must equal `true`
`verification.authority`	string	Required	must equal `"FreeTSA"`
`verification.method`	string	Required	must equal `"rfc3161-pinned-tsa"`
`verification.digest`	string	Required	pattern: `"^[a-f0-9]{64}$"`
`verification.anchored_at`	string	Required
`verification.serial`	string	Required
`verification.certificate_sha256`	string	Required	pattern: `"^[a-f0-9]{64}$"`
`verification.revocation_checked`	boolean	Required	must equal `false`
`verification.trust`	string	Required

Download input schema · Download output schema

Errors and retries

Follow the error recovery before retrying this read. Preserve the selected workspace, project, filters and feed. Recovering a read does not require an idempotency key or another verification job. See error recovery for status, scope, cooldown, cursor and retry handling. Unknown observations are result data and do not establish loss.

HTTP resource routes

This operation has no separate resource alias. Use its generic command route in a matching environment.

Continue

Follow the related workflow. See capability status for availability or the command index for another operation.

Overview

MCP, CLI and API commands

CLI client

HTTP and events

Optional local workflows

Read an external timestamp receipt

Example request

Returned result

Input fields

Validation and omitted values

Output fields

Errors and retries

HTTP resource routes

Continue

​Example request

​Returned result

​Input fields

​Validation and omitted values

​Output fields

​Errors and retries

​HTTP resource routes

​Continue

Example request

Returned result

Input fields

Validation and omitted values

Output fields

Errors and retries

HTTP resource routes

Continue