# ProofPack: hash-locked delivery receipts for AI client work > Source: > Published: 2026-09-02 02:40:39+00:00 Agencies and freelancers increasingly ship AI-assisted work. The deliverable is often a prompt, a model output, and some surrounding context — but the handoff lives in email, Slack, or a shared doc. When a client asks “what exactly did we get?” you’re reconstructing history from chat logs. That’s an operational problem, not a cryptography problem. Still, a simple cryptographic receipt helps: lock the bytes, stamp the time, share one artifact. **ProofPack** turns that bundle into a timestamped, hash-locked delivery receipt: Think packing slip, not notarization. No special magic beyond hashing and packaging. The value is the workflow: one place to freeze “what we delivered” before the next revision cycle. Agencies and freelancers who want **delivery transparency** with clients — fewer ambiguous handoffs, clearer scope conversations after AI-assisted revisions. ProofPack is a **transparency / delivery-receipt** tool. It is **not** legal advice. It is **not** a compliance certification. It is **not** court attestation. If you need legal or regulatory assurance, talk to a lawyer or auditor. MVP is live. Free tier: **3 receipts**. Planned paid: Starter **$39/mo**, Pro **$79/mo**. [https://getproofpack.vercel.app](https://getproofpack.vercel.app)