This specification describes techniques for managing assets in a blockchain. One example method includes receiving, from a target user recorded in a distributed database of a blockchain network, a user input including a request to perform a contract operation on asset objects including digital assets corresponding to physical assets associated with the target user, in response to receiving the request, generating an asset container as an operation target of the contract operation, the asset container recording field information of the asset objects, generating an asset container group by dividing the asset container into the asset container group based on an association relationship between the asset objects, wherein the association relationship defines correspondences between each asset container in the asset container group and at least one other asset container in the asset container group, and performing the contract operation on the asset container group using a contract object.