Datasheet issue & sign-off

Issuing a calculator or case-study datasheet runs through a password re-authenticated sign-off flow that stamps a SHA-256 content hash onto the issued sheet, so a downstream reviewer can verify the chain from 'issued' to 'in hand' hasn't been tampered with.

• A datasheet is being formally issued for procurement or construction, not just shared as a working draft.
• You need cryptographic proof that an issued PDF matches exactly what was approved, not a value quietly edited after sign-off.
• You're building the equivalent workflow for a new datasheet type and want to reuse the same issue/re-auth pattern.

Re-authentication (password re-entry) at the moment of issue plus a SHA-256 hash of the issued content — the method mirrors the PHA e-signature/audit-trail pattern rather than inventing a separate scheme.