Evidence
Verify a constancia
How anyone checks that a constancia de entrega is authentic, unaltered and the current version.
Updated:
Anyone can verify a Notificado constancia — their own or one the other party filed — with no account, and without seeing the message content or the recipients' data.
On the verification page
Open /verificar (the constancia's QR code leads there) and pick one of two inputs:
- The code printed under the QR, for example
K7Q2-M9XD-4TPA. Case, spaces and dashes do not matter. - The PDF. Its SHA-256 is computed in your own browser: the file is never sent to our servers.
Reading the answer
| Answer | Meaning |
|---|---|
| Authentic and current | The constancia is Notificado's, unchanged, and the latest version. |
| Authentic, superseded | It is genuine, but a later version exists; the page says which. |
| Not found | The code or hash matches no constancia: it is not Notificado's, or it was altered. |
The PDF's signature
Every constancia carries a PAdES signature. Open it in Adobe Acrobat Reader or check it with pdfsig constancia.pdf; the signer fingerprint it must match is published in Evidence method.
From an assistant or the API
The same check is the MCP tool verifyConstancia and the query GET /_x/query/verify-constancia in the API reference. It is limited to 30 checks a minute. Recipe for agents: Verify a constancia.
Offline
For a check that depends on no web page at all, use the evidence package: The perito package.