SHA-256 INTEGRITY RECORD

Purpose: record a repeatable identifier for the exact bytes of a preserved
file. NIST’s forensic-science glossary describes a hash value as a string used
to substantiate the integrity of digital evidence or compare it with a known
value set.

macOS:
  shasum -a 256 "original-export.zip"

Windows PowerShell:
  Get-FileHash -Algorithm SHA256 "original-export.zip"

Linux:
  sha256sum "original-export.zip"

Record:

Item ID: ______________________________
Exact filename: ________________________
File size in bytes: ____________________
SHA-256 (64 hexadecimal characters):
________________________________________________________________
Command/tool and version: ______________
Calculated by: _________________________
Date/time and time zone: _______________
Storage location: ______________________

Re-run the same command after a transfer. Matching hashes support the narrow
conclusion that the later file’s bytes match the file that was originally
hashed. A hash alone does not prove authorship, truth, completeness, lawful
collection or admissibility.

NIST source: https://www.nist.gov/glossary-term/38726
