Undersign 언더사인 - 전자계약·전자서명

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About this app

Upload the completed contract PDF, designate the signer, and obtain the signature.

Undersign records the information that determines the validity of the signature—who signed and what was signed.

■ Parties and Roles

· Designate a signer, approver, and CC for each of the parties (A, B, C, and D).

· The approver approves or rejects the document before the signer on the same side. Since approval is not a signature, it leaves no record in the document.

· The CC recipient only views the document and receives the completed version.

· Signature requests are sent only to the person whose turn it is.

· If you do not know the other party's signer, leave the slot empty. The other party's representative will fill it in.

· Each party's approver and CC recipient are visible only within their respective group.

■ Identity Verification

· Choose for each signer from email/text link, access code, mobile phone authentication, or real-name verification through an identity verification agency.

· Resident Registration Numbers are not collected. ■ Recording and Sealing

· The document is hashed and preserved exactly as the signer viewed it on the screen.

· Viewing, consent, and signatures are recorded in an audit trail linked by a hash chain along with the timestamps.

· Upon completion, a certificate of completion containing the seal hash is issued. If the document is subsequently modified, the hash changes, allowing for the detection of the alteration.

■ In the App

· You receive notifications when a signature is in progress or completed, and tapping the notification takes you directly to that contract.

· Contracts are organized into projects (folders).

The other party can sign via the received link even without the app or an account.

Documents requiring a different method by law, such as wills or notarial deeds, cannot be substituted with an electronic signature.

What’s new

Undersign 언더사인 첫 정식 출시입니다.
- 계약서·동의서를 올리고 휴대폰에서 바로 서명을 요청하세요.
- 서명자는 앱이나 웹에서 서명 또는 도장으로 서명할 수 있습니다.
- 완료된 문서는 누가 언제 서명했는지 담은 기록과 함께 PDF로 보관됩니다.