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Airffic Sign

Record consent

Get someone's agreement to a document, recorded with their identity and a timestamp.

The app below is currently in Japanese. An English interface is on the roadmap; everything you enter stays on your device until you sign in.

例相手にはこう見えます

業務委託の条件（外壁点検）

2026-09-23 ・ hash 3f9a1c…

1. 業務：対象建物の外壁をドローンで撮影し、劣化箇所を報告書にまとめる 2. 期日：撮影日から 10 営業日以内に報告書を納品 3. 報酬：100,000 円（税別）。納品月の翌月末払い 4. 安全：航空法に基づく許可・承認を取得のうえ飛行する
氏名（本名）読んで同意する

読むにも同意するにもサインインが要ります（誰が同意したかを残すため）。Google でサインイン（無料）→

What Airffic Sign is

Keep a record of "I have read this and I agree", with the person's identity and the time. In Airffic Sign you place a document, share its URL, and the other person signs in, reads it and presses "agree". That is all it is. Internal agreements, contractor terms, consent forms for a briefing, acceptance of terms of use.

What is kept: the document text (with a hash for tamper detection), the agreeing person's account and email, their name, and the timestamp. A placed document cannot be changed afterwards; if it changes, the hash changes. The consent records for each document can be exported as CSV.

This is not an electronic signature under Japan's Electronic Signature Act, and it is not a substitute for a wet signature, a notary or a legally required signature in any jurisdiction. If a contract's validity may be disputed, ask a lawyer about the evidentiary weight. It is a light way to record who read and agreed to what, and when. The app itself is currently in Japanese; an English interface is on the roadmap.

How to use it

  1. 1Place the documentPaste a title and the text, then "place and create URL". The text can no longer be changed.
  2. 2Share the URLSend it by email or chat. The other person signs in with Google and opens it.
  3. 3They agreeThey read it, enter their name and press "I have read this and agree". The time and identity are recorded.
  4. 4Export the records"Consent records" shows who agreed to each document and when. Export as CSV.

Questions

Does it count as a legal electronic signature?
No. Identity rests on sign-in with a Google account; it has none of the mechanisms required by Japan's Electronic Signature Act or its electronic bookkeeping rules, nor of equivalents elsewhere. Where a legally valid signature is required, use an e-signature service.
Can I edit a placed document?
No. The text's hash is tied to the consent records, so a change would make it a different document. To change it, place a new one.
Does the other person need to sign in?
Yes, so that consent is tied to an account. One click with a Google account.
Who can see the document?
Anyone who has the URL and is signed in. The URL uses a hard-to-guess ID, but do not post it in public.
Can I sign a PDF?
No. Documents are plain text only. Inserting a signature image into a PDF is a future candidate.

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