Portable digital integrity proofs, verifiable offline.
SPE is a technical system that produces self-contained integrity proofs for digital objects. It enables any party to verify whether a file is bitwise identical to the version that was sealed at a given time.
The system is intentionally built around three explicit constraints:
SPE does not ask for trust. It enables verification.
Digital verification has entered a fragile phase: it is increasingly easy to modify content and increasingly common for “proof” to depend on the party who issued it.
Verification is often tied to the issuer. If the provider disappears, the proof becomes unverified. SPE produces proofs that remain verifiable independently of the provider.
Many systems mix integrity with truth or authorship. SPE avoids this: VALID does not mean “true”—it means “unchanged”.
AI inputs and outputs are unstable. SPE enables integrity proofs for inputs before inference and outputs after inference, without storing content.
User creates a portable proof bundle (ZIP) containing cryptographic artefacts. User retains full custody.
The verifier validates that the proof bundle itself has not been altered before checking the target object.
User compares a candidate file against the sealed reference. Results are binary: MATCH or MISMATCH.
Verifiable offline
By different parties
Across different systems
Stateless Infrastructure • Deterministic Proof