Bill signing and sealing refers to the behavior of the relevant parties to the bill signing, sealing or signing and sealing the bill. Signing and sealing the bill is an important condition for the validity of the bill act, and it is also a matter that must be recorded in the form of expression of the bill act. If the instrument lacks the signature of the parties concerned, the instrument will be invalid. The signatures and seals on the bill vary depending on the nature of the bill act, but the signing parties are the same. When a bill is issued, it is signed by the drawer; when a bill is transferred, it is signed by the endorser; when a bill is accepted, it is signed by the acceptor; when a bill is guaranteed, it is signed by the guarantor; when a bill is agency, it is signed by the agent; When the holder exercises the rights of the instrument, the holder shall sign and seal it. If the signature of the signing party on the bill does not meet the legal requirements, it will be invalid.

An invalid signature on a bill means that the signature of the drawer on the bill does not comply with the Negotiable Instruments Law and the following four provisions, and the signature has no validity under the Negotiable Instruments Law.

1. If the acceptor of a bank acceptance bill and the drawer of a bank draft or bank cashier's check affix the official seal of the bank instead of stamping the prescribed special seal on the bill, the signer shall bear the responsibility for the bill. responsibility.

2. If the drawer of the check does not affix a special financial seal that is consistent with the signature reserved by the unit at the bank but affixes the official seal of the drawer, the signer shall be responsible for the bill. .

3. If the bill is affixed with the seal of the bank department instead of the special seal in violation of the regulations, the payer or agent shall bear responsibility if the bill is paid.

4. The signature of the endorser, acceptor or guarantor of the bill on the bill does not comply with the provisions of the Bill Law and the "Implementation Measures for the Management of Bills", or the person has no capacity for civil conduct or a person with limited capacity for civil conduct. If a person signs a bill and seals it, his signature is invalid, but it does not affect the people's court's determination of the validity of other signatures on the bill. ?