照片来源封签·Photo Provenance Seal

O/SExperimental / 实验性noindex · minors_counselstep 1

L-07 records a fingerprint of your exact file. Independent timestamping is not yet integrated: the time shown comes from /land's own clock. The record is signed and publicly logged, so changes to the record can be spotted. Anyone with the link can check whether their copy is that file, and if it isn't, get a clearly labeled estimate of how it compares.

L-07 会记录你这份文件的指纹。独立时间戳尚未接入，显示的时间来自 /land 自身时钟。记录经过签名并写入公开日志，记录如被改动可以被发现。任何拿到链接的人都能核对手里的副本是不是这份文件；如果不是，还会得到一个明确标注为估计的比对结果。

What a seal does / 封签做什么

Does / 会

Records your exact file (its SHA-256 fingerprint). Independent timestamping is not yet integrated; times come from /land's own clock.记录你这份文件本身（SHA-256 指纹）。独立时间戳尚未接入，时间来自 /land 自身时钟。
Gives you a verify link, QR code and badge to share next to the photo.提供核验链接、二维码和徽标，可以放在照片旁边一起分享。
Lets anyone check a copy: exact match or not (O), plus a similarity estimate (S) if it isn't.让任何人核对副本：是否完全一致（O）；不一致时，另附相似度估计（S）。

Does not / 不会

It can't stop anyone from editing, screenshotting or using AI to re-generate the photo.无法阻止任何人修改、截图或用 AI 重新生成这张照片。
It doesn't prove the photo is real, unstaged, or unedited before it was sealed.不能证明照片是真实的、不是摆拍，或封签前没有被修改过。
It doesn't prove who took the photo, who owns it, or who is in it.不能证明照片是谁拍的、归谁所有，或照片里是谁。
A photo without a seal isn't suspicious. Most photos are never sealed.没有封签的照片并不可疑。绝大多数照片从未封签。
It doesn't detect or recognize faces or identify anyone.不检测、不识别人脸，也不辨认任何人。

O · Checked · S · Estimate

O · Checked against the stored, signed seal record: exact file fingerprint, signature, timestamp and public log entry. Anyone repeating these checks with the same record and file gets the same answer. Status comes from /land's signed status service.

O · 已核对：直接对照已保存并签名的封签记录，包括文件指纹是否完全一致、签名、时间戳和公开日志条目。用同一份记录和文件重复核对会得到同样结果；状态来自 /land 签名的状态服务。

S · Estimate: an automated comparison of how the photos look, such as 'looks broadly similar' or 'this area looks different'. It can be wrong either way, and it never proves a photo was edited or that it wasn't.

S · 估计：自动比较照片外观得出的推测，例如“看起来大体相似”“这个区域看起来不同”。可能误报也可能漏报，既不能证明照片被改过，也不能证明没被改过。

1 · Choose a photo to seal

Use the earliest file you have, ideally straight from the camera or phone. Copies saved from chat apps or social sites are usually re-compressed.请使用你手里最早的文件，最好是相机或手机直出的原图。从聊天软件或社交网站保存的副本通常已被重新压缩。

Drop a photo here, or choose one把照片拖到这里，或点击选择JPEG, PNG or WebP · one still image · up to 25 MB

Method / 方法

A seal records which bytes were registered and a time they existed by. Changes to the record can be spotted. It does not prove the scene is real or unedited. Experimental instrument. Public launch waits on minors_counsel.

封签记录的是被登记的字节，以及它们不晚于某一时间已存在。记录如被改动可以被发现。它不能证明现场真实或未经修改。实验性工具。公开上线须待 minors_counsel 审查。

Grade O checks the signed record and exact SHA-256. Grade S is a 16×16 luma-grid estimate (PNG in v1) and can be wrong either way. Originals are not stored.