An audit hash is a tamper-evident cryptographic fingerprint that seals each ledger entry. The hash is computed over the entry's contents together with the hash of the previous entry, chaining the whole ledger together.
Because each hash depends on the one before it, altering any past entry would break every hash that follows — the change cannot be hidden. This means the historical record behind a trust score cannot be quietly rewritten. Anyone can independently confirm that a ledger entry is authentic and unmodified using the public verifier at /verify/, which recomputes the chain from a pasted entry or hash.