Use sensitivity, mutability, verification, and cost to place data on-chain or off-chain.
A credential app must let employers verify diplomas without permanently publishing sensitive diploma details. Boundary tests: sensitivity, mutability, verification, cost. The common trap is treating on-chain storage as a trust upgrade for every field. Permanent publication can turn privacy and correction requirements into long-term risk. Sensitivity Names, student identifiers, and degree details are sensitive enough to avoid broad permanent exposure. Confidentiality is not automatically served by a public ledger. Mutability Diplomas may need corrections, revocations, or re-issuance. The design needs version events, not silent edits. Append-only systems can correct by adding new events, but full documents should remain manageable. Verification…
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