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How to Sign a Document Using iD-One

Step-by-step guide for signers verifying their identity with iD-One

Answer

iD-One is a TradeLink-issued digital identity backed by a PKI Class 12 certificate. When a sender requires identity verification, you can use iD-One to confirm your identity by entering your registered email and a one-time password (OTP).

What You Need
  • An active iD-One account registered with TradeLink
  • Access to the email address linked to your iD-One account
  • The signing link from the envelope invitation email

Don't have an iD-One account yet? See the article "How to Apply for an iD-One Account" before proceeding.

Step-by-Step: Signing with iD-One

Step 1: Open the document singing link from the invitation

Click “View Document” in the envelope invitation email you received. The document will open in Foxit eSign.

Step 2: Review and complete the required fields, add your signature, and click Finish.

Apply your signature to the required fields and click Finish to submit.

Step 3: Select iD-One as your verification method

A "Verify your identity to complete signing" dialog will appear. Click Continue with iD-One →.

Step 4: Enter your registered email address

Type the email address linked to your iD-One account, then click Retrieve One-Time Password.

Step 5: Check for the OTP email

An OTP will be sent to your registered email address. The code is valid for 2 minutes. Open your inbox and copy the code.

Step 6: Enter the OTP

Paste or type the OTP into the verification field, then click Verify. Your identity is now confirmed.

Step 7: Complete your signature

You will be returned to the document. Apply your signature to the required fields and click Finish to submit.

 

What If My Email Is Not Recognised?

If you enter an email address that is not linked to an iD-One account, the button will change to Apply for iD-One. Click it to be redirected to the iD-One application portal. Once your account is approved, return to the signing link and try again.

What If I Don't Receive the OTP?
  • Check your spam or junk folder
  • Use the Resend OTP link below the OTP field — it becomes available after 30 seconds
  • Make sure you entered the correct email address — use ← Use a different email to go back
  • Contact your IT administrator if the issue persists
Legal & Audit Trail

Both iD-One and iAM Smart are legally equivalent and recognised under Hong Kong's Electronic Transactions Ordinance (ETO) (Cap 553). Your chosen method and verification timestamp are recorded in the Foxit eSign audit trail alongside your signature.

iD-One is backed by a Personal (Remote) ID-Cert Class 12 digital certificate, issued by Digi-Sign — a wholly-owned subsidiary of Tradelink and the only commercial Recognized Certification Authority under the ETO in Hong Kong.

Frequently Asked Questions

Q: Can I use any email address?

A: No — only the email address registered with your iD-One account will work. If you are unsure which email is registered, contact TradeLink support.

Q: How long is the OTP valid?

A: The OTP expires 2 minutes after it is generated. If it expires, use the Resend OTP link to request a new one.

Q: Is my signature legally binding?

A: Yes. Signatures verified with iD-One comply with Hong Kong's Electronic Transactions Ordinance and carry the same legal weight as a handwritten signature.

Q: Can I switch to iAM Smart instead?

A: Yes — click Back to document on the iD-One lightbox and select Continue with iAM Smart → on the method picker.