The government limits the number of online signposts by limiting the number of online signposts, that is, the houses to be purchased have various conditions that do not meet the online signposts, which leads to the failure to sign contracts normally. In the field of real estate, online signing means that after the two parties sign the contract, they go to the relevant real estate departments for the record and publish it online. Then the online sign number will be given, and users can query online through the online sign number. Online signing is to make real estate transactions more transparent and prevent "one room selling more", which can be revoked after signing.

People's Republic of China (PRC) Civil Code

Article 209 The establishment, alteration, transfer and extinction of the real right of immovable property shall take effect after being registered according to law; Without registration, it will not take effect, except as otherwise provided by law.

Natural resources owned by the state according to law may not be registered.

Article 214 The establishment, alteration, transfer and extinction of the real right of immovable property, which should be registered according to law, shall take effect when it is recorded in the register of immovable property.

Article 215 A contract concluded between the parties on the establishment, alteration, transfer and extinction of the real right of immovable property shall become effective upon the establishment of the contract, unless it is otherwise provided by law or agreed by the parties. Failure to register the real right shall not affect the validity of the contract.