Integrity model
Defined compact append-only records containing timestamp, path, size and SHA-256 without storing tracked file contents.
Open Source / Python Automation / Daily Build
File Hash Ledger
/ Overview
A dependency-free Python CLI that records sequential SHA-256 file snapshots in a tamper-evident JSONL chain.
A single checksum verifies one file version, but it does not preserve a chronological record of later snapshots or reveal whether that history was edited.
/ Provided servicesClear thinking.
Clear thinking.
Practical delivery.
Defensive ledger handling
Canonicalized entry data for stable hashes, verified every link, and blocked new records when prior history failed validation.
Current-state checks
Compared each latest recorded file hash with the current file and reported unchanged, changed or missing status.
/ Solution
I built a standard-library Python CLI that appends file metadata and streaming SHA-256 hashes to JSONL, linking every entry to the previous entry hash and refusing to append to a damaged chain.
/ Impact
Sequential file-hash history
Tamper-evident hash chaining
Changed and missing-file checks
Nine passing standard-library tests
Python
hashlib, pathlib and chunked reads create portable SHA-256 snapshots without third-party dependencies.
JSON Lines
One canonical JSON object per line keeps records appendable, inspectable and suitable for local tooling.
Unittest
Nine tests cover known hashes, chain links, tampering, safe append refusal, file status, invalid JSON and symlink rejection.