A computer-implemented method for blockchain network data element processing and storage, the computer-implemented method comprising: receiving, by a blockchain data element processing server and from a client computing device, a request to store a data element into a blockchain network, the request comprising identity information of the client computing device, wherein the blockchain data element processing server stores a black library; determining, by the blockchain data element processing server, whether the client computing device is authorized to store the data element in the blockchain network based on the identity information of the client computing device; in response to determining that the client computing device is authorized to store the data element in the blockchain network, determining, by the blockchain data element processing server and using the black library, whether the data element is a sensitive data element; in response to determining that the data element is not a sensitive data element, transmitting, by the blockchain data element processing server and to the blockchain network, a blockchain data element generated based on the data element and that is signed using a private key of the blockchain data element processing server; receiving, by the blockchain network and from a client computing device, a request for a data element stored in the blockchain network; determining, by the blockchain network, whether the client computing device is authorized to obtain the data element; in response to determining that the client computing device is authorized to obtain the data element, sending, by the blockchain network, a response to the client computing device, the response comprising an encrypted data element, the encrypted data element comprising the data element that is encrypted using an encryption algorithm; receiving, by the blockchain data element processing server and from the client computing device, a request to obtain the data element in the encrypted data element; determining, by the blockchain data element processing server, whether the client computing device is authorized to obtain the data element; in response to determining that the client computing device is authorized to obtain the data element, obtaining, by the blockchain data element processing server, the data element from the encrypted data element using a decryption algorithm; determining, by the blockchain data element processing server, whether the data element is a sensitive data element; and in response to determining that the data element is not a sensitive data element, sending, by the blockchain data element processing server, the data element to the client computing device. receiving, by a blockchain data element processing server and from a client computing device, a request to store a data element into a blockchain network, the request comprising identity information of the client computing device, wherein the blockchain data element processing server stores a black library; determining, by the blockchain data element processing server, whether the client computing device is authorized to store the data element in the blockchain network based on the identity information of the client computing device; in response to determining that the client computing device is authorized to store the data element in the blockchain network, determining, by the blockchain data element processing server and using the black library, whether the data element is a sensitive data element; in response to determining that the data element is not a sensitive data element, transmitting, by the blockchain data element processing server and to the blockchain network, a blockchain data element generated based on the data element and that is signed using a private key of the blockchain data element processing server; receiving, by the blockchain network and from a client computing device, a request for a data element stored in the blockchain network; determining, by the blockchain network, whether the client computing device is authorized to obtain the data element; in response to determining that the client computing device is authorized to obtain the data element, sending, by the blockchain network, a response to the client computing device, the response comprising an encrypted data element, the encrypted data element comprising the data element that is encrypted using an encryption algorithm; receiving, by the blockchain data element processing server and from the client computing device, a request to obtain the data element in the encrypted data element; determining, by the blockchain data element processing server, whether the client computing device is authorized to obtain the data element; in response to determining that the client computing device is authorized to obtain the data element, obtaining, by the blockchain data element processing server, the data element from the encrypted data element using a decryption algorithm; determining, by the blockchain data element processing server, whether the data element is a sensitive data element; and in response to determining that the data element is not a sensitive data element, sending, by the blockchain data element processing server, the data element to the client computing device.