Big things. Tiny keys.

h128.

A whole world.
A pocket-sized key.

Your film. Your archive. Your next big idea.
Keep a tiny key. Come back for the whole thing.

    /\___/\
   ( o   o )
   /   V   \
  /|       |\
 (_|_______|_)
    /     \

THE OWL KEEPS THE KEY.

take it with you.

SOMETHING BIG. SOMETHING SMALL.

h128-2cf24dba…c5b9e29e

A film. A library. A world.37 characters. One key.Keep it. Come back to it.

68 65 6c 6c 6f → SHA-256 → 2c f2 4d ba 5f b0 a3 0e · 68 65 6c 6c 6f → SHA-256 → 2c f2 4d ba 5f b0 a3 0e · 68 65 6c 6c 6f → SHA-256 → 2c f2 4d ba 5f b0 a3 0e · 68 65 6c 6c 6f → SHA-256 → 2c f2 4d ba 5f b0 a3 0e · 68 65 6c 6c 6f → SHA-256 → 2c f2 4d ba 5f b0 a3 0e · 68 65 6c 6c 6f → SHA-256 → 2c f2 4d ba 5f b0 a3 0e ·

The big idea / carry the key

Your whole library.
Room left in your pocket.

THE THING YOU WANT TO KEEP500 MB

A film. An archive.
A thousand small discoveries.

THE KEY YOU TAKE WITH YOU37 characters

Fits in a message.
Fits in a margin.

THE MOMENT YOU NEED ITThe whole thing.

Hand the key to your store.
Get the exact original back.

The original stays in a store you trust. The key identifies it; the store keeps it available.

Try the idea / big thing, tiny key

● YOUR BROWSER ONLY

All of this.
One little key.

A whole article. A file from your desktop.
Something too big for a message. A key that fits.

THE BIG THING / paste your whole article

FIELD NOTES FROM A SMALL PLANET
An imaginary archive, ready to travel.

01 / THE NIGHT LIBRARY
An owl waits at the window of a library. Inside are maps, letters, unfinished songs, photographs, and the record of an ordinary Tuesday. The collection is too heavy for a pocket. Its key is not.

02 / A FILM IN A MARGIN
A film can be five hundred megabytes. You keep its original in a trusted store, write its content key in the margin of your notebook, and take the notebook with you.

03 / THE RETURN
Months later, the filename has changed and the folder has moved. You hand the same key to the store. It finds the original bytes, and you verify that they match the key you kept.

04 / A LETTER CHANGES
Change one letter in these notes and the key changes. That is how a tiny reference can distinguish one exact version from the next. Keep a new version under its own key.

05 / THE WEIGHT
The key does not contain the archive. The archive still needs a home. What travels lightly is the reference: a small, stable way to ask for one exact thing.

06 / A THOUSAND ROOMS
Imagine a collection of weather journals, sketches of bridges, and recordings of rain. Pack them into one archive, store it, and carry one key for that archive.

07 / THE HANDOFF
You can give the key to another person or to a tool. If they have access to a store holding the original, they can fetch it and verify its contents.

08 / THE POCKET
A message, a footnote, a build manifest, a scrap of paper: the key fits in all of them. The large object remains where it is stored, waiting to be found.

09 / THE RECEIPT
A key answers which exact contents you meant. It does not decide who may read them or how long they survive. Those promises belong to the store.

10 / THE SAME THING
Copies with identical bytes share the same key, even when their filenames differ. An edited copy has a different fingerprint. Names travel; contents remain precise.

11 / THE EXPERIMENT
Paste a whole article into this box, or choose a local file. Your browser calculates the fingerprint without sending your content anywhere. This experiment does not store the original.

12 / THE NEXT PAGE
Take something large. Give it a small key. Keep the original somewhere you trust. Carry the key, and return for the whole thing when you need it.

2286 bytes / UTF-8

Or choose a local file (up to 50 MB)

Any file type. It stays on your device.

THE KEY YOU CARRY

37characters

h128-45a73c8ccbf5ce9793afec206befdde0

Enable JavaScript to calculate your own key.

Fits in a message.
Points to the exact original.

This demo only makes the key. Keep the original in a store to retrieve it later. Nothing is uploaded.

A tiny change / a different key

One letter.
A different universe.

ONE SMALL WORD.helloh128-2cf24dba5fb0a30e26e83b2ac5b9e29e

LOOK A LITTLE CLOSER.Helloh128-185f8db32271fe25f561a6fc938b2e26

report.txtcopy.txtSame contents. Same key. Even with another name.

Put it away / take it with you

Leave the weight.
Take the key.

Send a film without attaching the film.
Share the key with someone who can access its store.

h128 put hello.txt
h128 get h128-2cf24dba5fb0a30e26e83b2ac5b9e29e

With the h128 CLI configured for your own authorized store. Put returns a hash; get retrieves and verifies the exact bytes.

Curious how the key works?

Under the spell / the exact recipe

Small enough to fit in a prompt.

id     = "h128-" + sha256(bytes).hex()[:32]
format = h128-[0-9a-f]{32}
read   = GET /<id> from your own CAS
write  = PUT /<id> with raw bytes to your own CAS

A store verifies the hash before accepting bytes. Authentication and retention belong to the store. A 128-bit digest has about 64 bits of generic collision resistance; use full SHA-256 when stronger collision protection is required.

h128.

Your whole library.Room left in your pocket.

All of this.One little key.

One letter.A different universe.

Leave the weight.Take the key.

Small enough to fit in a prompt.

Your whole library.
Room left in your pocket.

All of this.
One little key.

One letter.
A different universe.

Leave the weight.
Take the key.