Offline evidence integrity: why signatures beat screenshots

A record that can be silently edited after the fact is an opinion with a timestamp. For evidence that gates energization, that is not good enough. The value of the record is precisely that it cannot be quietly rewritten when something is disputed later.

Holdpoint’s evidence ledger is append-only: records are added, never updated or deleted. Corrections are new records that reference what they correct, so the history of a disputed asset reads as a sequence of attributed events rather than a final answer with no provenance.

Signatures are computed over canonical bytes, a deterministic serialization of the event, which means a record can be re-verified years later without trusting the system that stored it. Readings are kept as decimal strings rather than floats so the signed value is exactly the recorded value. These are unglamorous engineering choices, and they are the difference between a report and a record.