Custodian is an append-only record log. Every entry is cryptographically linked to the one before it — so if anything is altered later, even by a system administrator, the break is provable, not just suspected.
This is a real hash chain, computed in your browser. Edit any field below the way someone covering their tracks would — then watch what happens to every entry after it.
A patient chart, an inspection report, a signed-off form — someone claims it was altered after the fact. Custodian proves whether it was, without relying on server logs someone could also edit.
Every access, review, and modification of a document is chained in order. If a link in that chain is broken, you know exactly where and can't paper over it.
Instead of "we have logs," you show a chain that a third party can independently verify — including against an external timestamp you don't control.
Who did what, to which document, and a hash of that document's exact contents at that moment.
The entry's hash is computed from its own data plus the previous entry's hash — a chain, not a pile.
Recompute the hashes and compare. If one doesn't match, you know precisely which entry was touched.
Early access is by conversation, not signup form — tell me what you're trying to prove and to whom.