Glossary
Hash chain
Records where each one carries the digest of the one before, so altering one breaks every later link.
Read the termGlossary · Term 38 of 39
Tamper-evident
Tamper-evident means any later change to a record can be detected; it does not claim that a change is impossible. At L1 Guarded, elan1 hash-chains every proof record, so recomputing the chain shows whether an earlier record was altered. That is why elan1 says tamper-evident, not tamper-proof or immutable.
In one sentence: A record where any later change can be detected. It does not claim that a change is impossible.
01In more detail
What it means in practice
Tamper-evident and tamper-proof are different claims. A tamper-evident record shows that a change happened; a tamper-proof one would claim a change cannot happen. elan1 makes only the first claim, because it is the one you can check.
At L1 Guarded you check it yourself by recomputing the chain. From L2 Attested, signatures and outside timestamps let someone else, such as an auditor, check it without asking elan1.
02Where this shows up in elan1
Every proof record at L1 Guarded, where records are SHA-256 hash-chained.
Defined in the elan1 glossary · Last reviewed 10 Oct 2026. Definitions change only with a dated note.
// SEE IT
See the term in a governed action.
The walkthrough follows one write from intent to proof record, using the words in this glossary.