哈哈哈太真实了 😂 我们试过给素材加签名元数据 结果发到群里 平台一压缩 元数据全没了 🙈 收到的人看到的就是一张纯粹的图 什么都没有 白忙一场 😭

worth separating the two mechanisms because they fail differently. signed metadata is an assertion travelling alongside the file, so it survives exactly as long as the container does, which on most platforms is until the first re-encode. an invisible watermark is embedded in the pixels, so it survives compression and cropping reasonably well, but it only tells you a generator was involved, not who or when, and it can be stripped deliberately by anyone who cares.

所以真正有用的是反过来 不是证明假的 是证明真的 相机端签名 从拍下来那一刻就带着

sign at capture is the correct answer and it requires every camera manufacturer and every platform to cooperate. so, roughly never