Stamped on the X1 chain

A film, sealed in the chain.

Download Night of the Living Dead (1968) back out of the X1 chain, verify it byte-for-byte against its on-chain hash, and play it — locally, on your machine.

Don’t want to install anything? Play it straight in your browser → (slower, and it needs the tab left open — but zero setup.)

File Night of the Living Dead (1968)

Size 1,862,510,336 B

Runtime 95.9 min

Video 1920×1080 · H.264

Chunks 2,069,456 × 900 B

Content hash sha256 8d5f6dd2…da3672d

1Get the toolkit

One command-line tool, zero dependencies. It pulls the stamp’s transaction history off the chain, reassembles the file, and verifies every chunk as it goes.

Download permadata-get.zip zero-dep CLI Stamp address

ALuMA6zrW9NWGACyK7SbExwyWteAeDz9YEANFkizNUU4

Download command

node permadata-get.mjs ALuMA6zrW9NWGACyK7SbExwyWteAeDz9YEANFkizNUU4 -o notld.mp4

2Three steps

Unzip the toolkit and run three commands. The download takes roughly 37–39 minutes on the free public RPC.

Install Node.js 20+

Check it’s there with node --version. If not, get it from nodejs.org.

node --version

Run the download

From the unzipped folder:

node permadata-get.mjs ALuMA6zrW9NWGACyK7SbExwyWteAeDz9YEANFkizNUU4 -o notld.mp4

On completion it prints RESULT: PASS. Interrupted runs resume from where they stopped.

Verify the hash

Compute the file’s SHA-256 and compare it to the stamp’s content hash.

sha256sum notld.mp4

On macOS: shasum -a 256 notld.mp4. It must equal the value in the verification section below.

3Check it plays

Drop the downloaded file here to play it in your browser.

Drop the file here or click to choose

video · audio · image

The file never leaves your machine. Playback happens entirely in your browser, from the local file — nothing is uploaded anywhere.

4Performance

Measured against the free, unauthenticated public RPC on 2026-10-19.

Endpoint	Status	Throughput	This film (1.86 GB)
https://rpc.mainnet.x1.xyz	available now	~0.80 MB/s (~929 chunks/s)	~37–39 min
API-keyed endpoint	not yet available	removes the ceiling	—
Your own node (tx history enabled)	bring your own	removes the ceiling	—

The ceiling is the public RPC’s request rate, not the tool. Sustained ~929 chunks/s, max JSON-RPC batch 85, peak downloader RAM ~435 MB — the file itself is never held in memory.
An API-keyed endpoint or your own node removes that ceiling. The tool already accepts --rpc and --api-key; the keyed endpoint is not yet available.

5Verify

The stamp commits to one SHA-256 hash. If your file matches, it is the exact bytes that were sealed on-chain. This check needs no software from us — it’s plain SHA-256.

Content hash (sha256)

8d5f6dd2bc41ab9b16db69b182beccddef1547da2dba6e3a3301da092da3672d

Exact command

sha256sum notld.mp4

macOS: shasum -a 256 notld.mp4

Merkle root (secondary integrity check)

58fbca5656decbd3beb675000fd034862f0087e2f121e07cba75b239c9953ba9

Optional. The content hash is the canonical identity; the Merkle root lets you prove every 900-byte chunk.