AIがあなたのスタイルを数秒でコピーできる時代——先に作ったことを証明する方法

AI can now generate an image in your visual style in under a minute. It can write prose that sounds like you. It can compose music with your signature sound. The technology doesn't care about copyright — it simply learned from your publicly available work.

For creators, this isn't a hypothetical threat. It's happening now.

Why AI Makes Timestamps Essential

Before generative AI, proving you created something first was about beating other humans to the punch. The timelines were months or years. Now, an AI can produce something that looks like your work within hours of your original being posted online.

When someone shares an AI-generated image that looks like your illustration, the question becomes: who had the original first? If your original is timestamped on the blockchain before the AI-generated version appeared, the answer is clear.

What the Law Says (So Far)

Copyright law worldwide is still catching up to AI. Courts in the US, EU, Japan, and elsewhere are actively hearing cases about AI training data and generated outputs. The legal landscape is evolving rapidly.

What isn't changing: if you can prove your original work predates an AI-generated copy, your position is dramatically stronger than if you can't. The fundamental logic of temporal priority still applies, even as the technology changes.

Protecting Yourself in the AI Era

Timestamp your work before posting it anywhere publicly. Once it's online, AI models can train on it and anyone can prompt a model to "create something like [your work]." Your timestamp proves the original existed first.

Consider timestamping your process materials too — sketches, drafts, iterations. These demonstrate the human creative process behind your work, which is increasingly important as AI-generated content becomes harder to distinguish from human-made content.

The creators who will thrive in the AI era are the ones who can prove, unambiguously, that they are the source — not the copy.