What is an event ledger?
An event ledger records what the system did with an event.
The receipt answers when bytes arrived and which source credential authenticated them. Validation says whether those bytes passed the configured checks.
Delivery records show attempts, timing and HTTP response status. A receipt alone does not prove delivery, and a hash does not prove that the original content was true.
Use an event ID to connect your source record with Data-Line history. Retention limits apply; the current ledger is not a certified evidence system.