What the report contains: the SHA-256 fingerprint of the original PDF as uploaded (HawkOpen does not produce a separate signed copy of the PDF), the time of signing from HawkOpen’s server clock (not a qualified timestamp), and HawkOpen’s Ed25519 signature on its record of the signing. The report states that it is not a qualified signature and not proof that the signer read the document.
How to check it independently: HawkOpen publishes its public key at a fixed address on its site, and the verification page checks the signature on the record. To check the document, compute the SHA-256 of your copy of the original PDF and compare it with the value in the report.
Keep the original PDF, the evidence report and any copy of the document exchanged with the signer, and ask a lawyer how evidence is assessed in your country. The HawkOpen e-signature is a preview version until external file scanning is switched on.