What you want to ask is, does the signature data at least include the signature time of the original information? include. Document display based on query originality. Digital signatures include the original text, public key certificate, and signature value (i.e., encrypted hash). To electronically sign or electronically sign a document, the sender's public key and private key are required. Therefore, the signature data at least includes: data content, data source, data purpose, data encryption algorithm, etc. Includes original message signature time.