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.

Available in the deployed MCP and HTTP bundle. Confirm access and inputs with your connected catalog. Workspace scopes and enabled providers 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 "$AGENTLINKOPS_API_URL/v1/commands/get_evidence_anchor" \
  -H "Authorization: Bearer $AGENTLINKOPS_API_KEY" \
  -H 'Content-Type: application/json' \
  --data '{"subject":"citation","observationId":"cio_example"}'

Returned result

Illustrative data validated against the documented response schema. IDs and dates are examples, not a live account capture. 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	The subject value; allowed values and bounds are specified in this schema. 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. 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): Provider send attempts recorded for this delivery. 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).

All fields and nested objects

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}$“
`status`	string	Required	Resource lifecycle status. values: “pending”, “verified”, “failed”
`attempts`	integer	Required	Provider send attempts recorded for this delivery. minimum: -9007199254740991; maximum: 9007199254740991
`created_at`	string	Required	UTC timestamp when the record was created.
`last_error`	string / null	Required
`queryBase64`	string / null	Required
`responseBase64`	string / null	Required
`verification`	object / null	Required
`verification.verified`	boolean	Required	must equal true
`verification.authority`	string	Required	must equal “FreeTSA”
`verification.method`	string	Required	must equal “rfc3161-pinned-tsa”
`verification.digest`	string	Required	pattern: ”^[a-f0-9]{64}$“
`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

The command is annotated idempotent. Reuse an accepted idempotency key when the input provides one; changing the payload under a reused key can conflict. 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.

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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