Email is not proof of delivery

Email feels like proof — until a dispute happens.

Why email fails

• Does not prove file contents
• Does not prove files weren’t changed
• Can be disputed, edited, or selectively presented

What works instead

ImmutableProof creates an offline-verifiable delivery record. Once created, we cannot change it — even if we wanted to.

Download an example delivery record (ZIP)

sha256sum -c hashes.sha256

Create a delivery record

ImmutableProof provides cryptographic evidence of integrity and timing. It does not provide legal advice or guarantee admissibility.