Abstract: A method of uploading blockchain data includes: a sub-institution node group receiving a data upload request sent by a sub-institution; the sub-institution node group looking up a node in an idle state according to the data upload request; the sub-institution node group receiving data uploaded by the sub-institution through the node in the idle state and uploading the received data to a blockchain temporary storage area; and the master institution node of the master institution corresponding to the sub-institution downloading the data uploaded by the sub-institution from the temporary storage area, and then uploading the downloaded data to a blockchain data storage area.

Abstract: A method of uploading blockchain data includes: a sub-institution node group receiving a data upload request sent by a sub-institution; the sub-institution node group looking up a node in an idle state according to the data upload request; the sub-institution node group receiving data uploaded by the sub-institution through the node in the idle state and uploading the received data to a blockchain temporary storage area; and the master institution node of the master institution corresponding to the sub-institution downloading the data uploaded by the sub-institution from the temporary storage area, and then uploading the downloaded data to a blockchain data storage area.

Abstract: A method includes: a supervisor writes a digital certificate and a corresponding first public key into an intelligent contract of a blockchain corresponding to an asset type to be supervised, so that all institutions with asset accounts under the asset type can obtain the first public key of the supervisor through the digital certificate, so as to generate an additive homomorphic key for homomorphic encryption of the balance of an asset account; when checking the balance of a new account of a transactor, the supervisor obtains a public key in a public-private key pair corresponding to the new account, generates an additive homomorphic key based on a supervision private key corresponding to the supervisor and a predetermined key exchange protocol and the public key in the public-private key pair according to the key exchange protocol, and decrypts the encrypted balance of the new account, using the generated additive homomorphic key.

Abstract: A block chain-based multi-chain management method comprises: constructing a virtual node for each mechanism node, the virtual node comprising node clusters generated based on block chains in which each mechanism node participates for processing different affairs and/or flows; constructing a block chain identity management module and a block chain transaction agent module for each constructed virtual node; connecting identity information of each mechanism node to a block chain identity management system corresponding to block chains in each virtual node by means of the block chain identity management module; and acquiring the identity information corresponding to each transaction by means of the block chain identity management module, packaging the acquired identity information and corresponding transaction parameters to generate packaging information, and sending the packaging information to a target block chain executing the corresponding transaction for transaction execution, by the block chain transaction

Abstract: A method includes: a supervisor writes a digital certificate and a corresponding first public key into an intelligent contract of a blockchain corresponding to an asset type to be supervised, so that all institutions with asset accounts under the asset type can obtain the first public key of the supervisor through the digital certificate, so as to generate an additive homomorphic key for homomorphic encryption of the balance of an asset account; when checking the balance of a new account of a transactor, the supervisor obtains a public key in a public-private key pair corresponding to the new account, generates an additive homomorphic key based on a supervision private key corresponding to the supervisor and a predetermined key exchange protocol and the public key in the public-private key pair according to the key exchange protocol, and decrypts the encrypted balance of the new account, using the generated additive homomorphic key.

Abstract: Disclosed is a zero-knowledge multi-account-book exchange transfer method and apparatus based on blockchain, and a storage medium. The method comprises: a first user account under a first account book in a blockchain issuing a transaction request with a second user account under a second account book, and receiving a first ciphertext generated by means of a first user performing encryption; acquiring the first ciphertext and a first verification ciphertext that have been subjected to a digital signature; calculating each corresponding first verification value ciphertext by means of several preset legal exchange rate values and the first ciphertext; calculating, a second verification value ciphertext for verifying whether a preset exchange rate of the transaction between the first account book and the second account book is within a preset legal exchange rate value range; and if so, completing the transfer transaction based on the first ciphertext and the first verification ciphertext.