Subject to availability. If there is no fingerprint in the house purchase contract, but there is the signature of the parties, the contract is valid; if the contract has neither the signature nor the thumbprint of the parties, the contract is invalid. Relevant judicial interpretations stipulate that if the parties conclude a contract in the form of a contract, they must sign or seal it. If the parties concerned press their fingerprints on the contract, the people's court shall determine that it has the same legal effect as a signature or seal. Legal basis:

Article 490 of the Civil Code: Where the parties conclude a contract in the form of a contract, the contract is established when both parties sign, seal or fingerprint. Before signing, sealing or fingerprinting, one party has performed its main obligations and the contract is established when the other party accepts it.

Laws, administrative regulations or the parties agree that a contract should be concluded in writing. If the parties do not do so in writing but one party has performed its main obligations and the other party accepts it, the contract is established.