A product that promises your documents are verifiable must itself be verifiable. These numbers aren't ours: they're on the public Bitcoin chain and anyone can check them.
Download any document's proof, install the official OpenTimestamps client and run ots verify. The answer comes from Bitcoin, not from this site.
If CODEX disappeared tomorrow, your proofs would still be valid: they live inside the file and on a chain nobody controls.
We are not a qualified trust service provider (QTSP). Acceptance is a simple electronic signature (eIDAS art. 25) with reinforced proof. Deeds and powers of attorney need something else, and we say so.