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An authenticated database (ADB) that provides succinct proofs of any value ever associated with a key. Its implementation is based on an Mmr over a log of state-change operations backed by a Journal.
In the Any db, it is not possible to prove whether the value of a key is the currently active one, only that it was associated with the key at some point in the past. This type of authenticated database is most useful for applications involving keys that are given values once and cannot be updated after.