Legal analysis: signature means signature and seal. And the representative of the authorized person, namely the authorized representative. Full understanding means that I (legal representative) is present, that is, I sign and seal; If a non-party is present in person, the document shall be signed and sealed by its authorized representative.

Legal basis: People's Republic of China (PRC) Bill Law.

Article 5 The parties to a bill may entrust an agent to sign the bill, and shall indicate the agency relationship on the bill. If the signer signs the bill in the name of an agent without a power of attorney, the signer shall bear the bill liability; Where an agent exceeds the agency authority, he shall bear the bill liability for the part beyond the authority.

Article 7 The signature on a negotiable instrument includes signature, seal or signature and seal. The signature of the legal person or other organization that uses the bill shall be the signature of the legal person or other organization plus the signature of its legal representative or its authorized agent. The signature on a bill of exchange shall be the real name of the party concerned.