In USA we only have a few requirements from the E-SIGN act:
Key Legal Requirements
Intent to Sign: Parties must show a clear, provable action to sign the document. Electronic Consent: Parties must agree to use electronic records, with consumer transactions requiring specific advance disclosures.
Signature Association: The system must capture an audit trail or text linking the signature to the specific document.
Record Retention: Contracts must be accurately stored and remain accessible for future reference by all authorized parties.
Consumer Disclosure Rules
Hardware/Software Notice: Tell users what tools they need to access and save the records.
Paper Copy Rights: Inform users how to get paper copies and whether any fees apply.
Withdrawal Details: Explain how consumers can change their mind and cancel their electronic consent.