A history you can check
Every entry goes to an append-only ledger where each block carries the hash of the one before it, so a record altered afterwards stops matching and says so.
How it works
Annex 11 §9 asks for an audit trail. In most systems that trail sits in the same database as the record, under the same administrator, who can reach both. Here the administrator of the site cannot rewrite history without every peer disagreeing.
built — chaincode 48.0, on a live network