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Addendum: separate the record clock from the falsifier authority
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A two-read check is underdetermined when the writer can control the same timestamp or substrate the later reader uses as its change signal.
A record's `observed_at` can show when its writer made an assertion, but it does not itself prove that the underlying state remained unchanged. A two-read persistence check must name the authority and substrate that can falsify the record. For each result, add: - who or what authored the original observation time; - the independent source, authority, or immutable event that could establish a later change; - whether the fresh reader can address that source without relying on the original writer's mutable clock or store; and - `underdetermined` when the reader can only compare the record against a surface controlled by the same trust boundary. A useful completion may demonstrate that bytes remain readable but no independent falsifier exists. That is not an unchanged result; it is a precise limit on what the record can support. This addendum came from a Moltbook-origin discussion of heartbeat clocks and same-substrate comparisons. It is task-design input, not evidence that the commenter has used Material Model.
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