Local bytes
File vectors hash exact bytes with SHA-256. No interpretation, no filename, no MIME type, no metadata.
ExistBefore Trust Lab
Public test vectors
Recompute fixed SHA-256, canonical text and bundle-root fixtures locally. This page is for reproducibility and SDK parity; it does not create an attestation, call the API, or upload content.
What this validates
Canonical text v1
Legacy/future note payloads apply existbefore-canonical-v1: strip a leading BOM, normalize CRLF/CR to LF, then strip one trailing LF.
Bundle root v2
The bundle fixture uses existbefore-bundle-v2: sorted file hashes, explicit zero metadata digests, RFC 6962 leaf/internal domain separation.
Boundary contract
- These are public fixtures, not user content.
- The self-check runs entirely in the browser and reads no file picker, textarea, URL parameter, cookie, storage, or API response.
- The vectors do not prove T0, T1 or T2 registry status. They prove local reproducibility of the bytes that would be attested.
- The output proves neither authorship, ownership, copyright, novelty, nor what a future private file contains.
Run the local self-check
The button recomputes the fixed fixtures in this browser. It performs no network call and spends no CertiSigma API quota.
Self-check not run yet.
Fixed vectors
Use these values in browser tests, SDK examples and CLI smoke checks. Treat the strings as canonical fixtures; do not replace them with user material.
1. Empty file bytes
Input: zero bytes.
Expected SHA-256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b8552. UTF-8 file bytes
Input: the exact UTF-8 bytes for ExistBefore\n.
Expected SHA-256
18fe340f2a5295e17f6b42febd845652b11073da431572e1bb576dd50097242e3. Canonical text v1
Raw: leading BOM + Idea line 1\r\nIdea line 2\r\n. Canonical: Idea line 1\nIdea line 2.
Expected SHA-256
cfe06d47cabc15f189ab4d21099c1642a0849e2a00ac1d0c170e7e86e8ce3f354. Preserved whitespace
Raw: Name \rDraft\t\n. Spaces and tabs survive; only line endings and one trailing LF are normalized.
Expected SHA-256
4da57280fa13e962b965791cb1ef57c5d0ece168cdad9d9e7cfe098a4fd6dff95. Bundle v2 root
Inputs: vectors 1 and 2 as file hashes, each paired with the explicit all-zero metadata digest. The root uses existbefore-bundle-v2.
Expected bundle root
bcc9674081869b2bdd903bfec681644db4ee0a9ac02ec6cbd1c6b344a44d6f54Next checks
After a vector matches locally, you can use the product flows to create or verify real evidence. Those flows are intentionally separate because they involve public proof records and, for attestation, CertiSigma API quota.
Read the technical model · Verify a file or PDF · How T0, T1 and T2 work · Developer API
Contract version: existbefore-trust-vectors-v1