Ledger
AvailableA log of what happened on this machine that you can hash and trust later.
The isolated-box problem
Something changed. A note in a text file is a rumor. You want a trail that is annoying to rewrite after the fact.
What it does
A folder of jsonl ledgers. Each note stores SHA-256 of its index, time, body, and the previous note's hash. CLI for the box, plus a small UI on the LAN. verify walks the chain and fails if an old line was edited.
Hashing and verify
Hashing is a fingerprint, not encryption. Anyone with the folder can still read the notes. The first note's prev is the word genesis. verify recomputes every hash and checks that prev pointers and indexes still line up. It will not catch a rewrite of the whole file where every hash is recomputed. It will catch a silent edit, a dropped line, or two notes swapped.
This one runs. From the repo: cd ledger && deno task compile && ./ledger.sh --dir ./ledgers serve
Carry-in
Init on a connected machine, copy the folder, run it dark. This one is real.
Carry-in flow
deno run -A jsr:@decomm/ledger/init ./ledger