Personal Digital Signature Management
What Is a Digital Signature
A digital signature is an electronic authentication technology based on encryption algorithms, used to verify the identity of the signer and ensure that the document content has not been altered after signing. In Nota Sign, digital signatures are implemented through encryption verification using digital certificates issued by trusted third-party Certificate Authorities (CAs). This ensures that electronic documents have the same legal validity as handwritten signatures or company seals.
Digital signatures ensure that:
The document source is authentic and the signer’s identity is verifiable.
The signed content cannot be tampered with; the signed file can be independently verified by third parties, preventing forgery.
Typical Application Scenarios
Digital signatures are widely used in formal electronic documents requiring identity verification and anti-tampering validation, including:
Corporate contracts, agreements, and official correspondence;
Internal documents such as procurement, approvals, tenders, and financial reports;
Government and institutional document circulation;
Overseas remote signing and cross-border electronic contracts.
Digital Signature Authorities and Certificate Types Supported by Nota Sign
DigiSign (iD-One)
DigiSign iD-One is a China Hong Kong government-recognized trusted service provider compliant with ETSI eIDAS and WebTrust international standards. Its digital certificates are globally recognized across major e-signature platforms, supporting remote signing without physical media and ensuring secure, verifiable digital transactions. It is widely used in Hong Kong e-government, banking, insurance, and education sectors, serving over 500,000 users worldwide with trusted remote signing services.
Issuing Authority: Tradelink Digi-Sign Certification Authority (Hong Kong)
Certificate Type: Personal Remote Digital Certificate (iD-One Remote ID-Cert, Class 12)
Applicable Scenarios: Overseas individual users and cross-border signing.
ZXCA
ZXCA is a licensed electronic certification authority registered with the State Cryptography Administration of China, using national cryptographic algorithms (SM2/SM3/SM4) in full compliance with the Electronic Signature Law.ZXCA supports the binding of electronic seals with digital signatures, ensuring both legal validity and data integrity, and provides cross-border signing solutions for enterprises in mainland China or those requiring domestic identity verification for international agreements.
Issuing Authority: Zhixin Digital Certification Co., Ltd.
Certificate Type: Personal Digital Certificate (SM2 Algorithm)
Applicable Scenarios: Enterprises, institutions, and individuals within mainland China.
How to Enable Digital Signatures
Log in to your Nota Sign, click Admin > Digital Signature to access the Digital Signature Management page.
If you have not purchased any digital signatures, click Go to Purchase and contact sales to obtain the desired number of digital signature licenses. Purchased certificates will be automatically installed.
If you have already purchased and installed digital signatures, the page will display all available certificate types.
Check Enable Digital Signature, then select the desired certificate type to use.
How to Use Digital Signatures to Send or Sign Envelopes
Using a digital signature constitutes an Advanced Electronic Signature (AES). For details on how to initiate signing, please refer to Sending an AES Envelope. For signing instructions, please refer to Signing an AES Envelope.