When you write a prompt, you author an idea. Until now, there was no way to prove it. PromptLedger changes that, silently and instantly, at the moment of creation.
Learn moreEvery AI platform (ChatGPT, Claude, Midjourney, Gemini) processes your prompt and discards it. The response is kept, trained on, and displayed. The prompt, the original human thought that produced it, leaves no traceable record.
As courts and regulators increasingly locate creative ownership in the prompt rather than the AI output, the absence of a timestamped record is becoming a material legal and commercial risk. If two people arrive at the same idea (the same prompt, the same project, the same concept) the dispute becomes impossible to settle. There is no mechanism to establish who got there first.
Existing tools (content watermarking, blockchain NFTs, file notarisation) all protect the output. None of them protect the prompt. That gap is what PromptLedger was built to close.
"The output is the rendering.
The prompt is the idea.
We built the infrastructure to prove it."
PromptLedger
PromptLedger sits quietly between you and any AI tool, as a browser extension, a desktop application, or an enterprise network layer. The moment you submit a prompt, it captures a cryptographic fingerprint of your exact words, obtains a trusted timestamp from an independent authority, and anchors both to a public blockchain. The entire process takes milliseconds. Your workflow doesn't change.
The underlying mechanism combines three independently verifiable layers: a SHA-256 hash of your prompt content, an RFC 3161 timestamp signed by a trusted third party, and an immutable blockchain record. Together they produce a certificate that proves, to any court or counterparty, that you authored that specific prompt at that specific moment. The prompt itself is never revealed unless you choose to share it.
For teams and enterprises, PromptLedger also runs a semantic similarity search across your organisation's prompt history, surfacing near-duplicate prior work before it becomes a dispute. And for situations where you need to prove ownership without disclosure, a zero-knowledge proof lets you demonstrate you hold the original without sharing a single word.
01 · Stamp
Hash, timestamp, and anchor every prompt to the blockchain at the moment of creation. Instant. Silent. Permanent.
02 · Search
Semantic search across your prompt history to surface similar prior work, inside your team or across your organisation.
03 · Prove
Demonstrate you hold the original prompt to any third party, without revealing its content. Privacy-preserving ownership.
In 2026, US federal courts affirmed that AI systems cannot hold copyright or inventor status. Creative and commercial ownership in AI-assisted work resides in the human author of the originating prompt. The prompt is now the legally decisive object, and it is still almost universally unprotected.
The EU AI Act Article 50 enforcement begins August 2026, requiring provenance metadata on AI-generated content at scale. Organisations that cannot trace the human origin of their AI work will face regulatory exposure. The creators and companies building that infrastructure now will have a structural advantage that is very hard to close later.
We are early. That is the point.
PromptLedger is in early development. We are looking for the people who feel this problem personally: creators, builders, and teams for whom prompt authorship already matters. If that is you, register now and you will be the first we reach out to.
First to know. First in.