A cryptographic hash is a mathematical function that converts any amount of data (text, file, thesis) into a fixed-length unique “fingerprint” (here: 64 characters using SHA-256).
Key properties:
- Unique: even a single space or period difference produces a completely different hash.
- Irreversible: you can never reconstruct the original text from the hash.
- Deterministic: the same input always produces the same hash.
- Fast: hashing an entire thesis takes milliseconds.
Why do we use hashes in the Open Internet Manifest?
- Every thesis, guide, and concept has an official hash.
- You as a reader can copy the text, hash it yourself (with SHA-256), and compare it to the official hash.
- Does it match? Then you know with 100% certainty you’re reading the authentic, unaltered version.
- If anyone (even the maintainer) changes a single letter? The hash no longer matches → change immediately visible.
The hashes make the manifest decentrally verifiable: no need to trust a central source, only mathematics.
“A hash is digital sealing wax: break it, and everyone sees it.”
— Ruben Berkhout
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🔒 Verify integrity of this page (SHA256)
How to verify?
- Copy the page text with the button below
- Go to an online SHA256 tool, e.g. this one.
- Paste the text and calculate the hash.
- Paste the hash below and click "Verify".