DocProof

什么是 DocProof？

DocProof proves a document existed at a specific moment — without storing the file. Upload any file → SHA-256 fingerprint computed in memory → file discarded immediately. You get a UTC timestamp, a Proof ID, a shareable verification link, and a PDF certificate. Perfect for founders, freelancers, and developers who need to prove ownership before sharing. $9 one-time per proof — no subscription, no account required.