Advanced New Technologies Co., Ltd.

Alipay (hangzhou) Information Technology Co., Ltd.

Alibaba Group Holding Limited

Alipay Information Technology Co., Ltd.

Antchain Technology Pte. Ltd.

Zhonghao Lu

Haizhen Zhuo

Benquan Yu

Faqiang Wang

Hui Zhang

Yanan Zhang

Xin Ye

Wenjie Wang

A computer-implemented method, medium, and system are disclosed. In one computer-implemented method, an invocation request sent by an initiator is received by a blockchain node in a blockchain network. The invocation request is associated with invocation of a smart contract in the blockchain network. The smart contract includes contract code, data, and pre-update metadata. A pre-update data structure described by the pre-update metadata is parsed by the blockchain node and by execution of the contract code. The pre-update data structure is associated with the data comprised in the smart contract. Following parsing of the pre-update data structure, the pre-update data structure is represented by the blockchain node using a computer programming language. The pre-update data structure specified by the computer programming language is sent by the blockchain node to the initiator.

Methods and apparatuses for reading and updating data structures, and electronic devices

This disclosure relates to blockchain-based leasing. In some aspects, a leasing party node device of a blockchain network comprising a plurality of connected blockchain nodes acquires leasable state data of a target lease object based on a unique identifier that uniquely identifies the target lease object. The leasable state data is stored in a distributed database on the blockchain network and the leasable state data specifies a leasable state of the target lease object. Lease information of the target lease object is generated in response to acquiring the leasable state data. A first update transaction is transmitted to the blockchain network to update the leasable state of the target lease object. The first update transaction includes at least a portion of the lease information.

Blockchain-based leasing

Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based hierarchical data storage. One of the methods includes: determining, based on a blockchain stored in a database that includes multiple levels of storage, a block number interval that includes one or more block numbers associated with data nodes to be migrated to a lower level of storage in response to the data nodes meeting a data migration condition, wherein each of the data nodes is included in a state Merkle tree and is associated with a block number of a block of the blockchain where the corresponding data node was last updated, and the lower level of storage corresponds to a storage media with lower storage cost.

Blockchain-based hierarchical data storage

Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for storing blockchain data. One of the methods includes receiving a plurality of blocks from a blockchain node in the blockchain network; for each of the plurality of blocks: determining a first number of blockchain nodes that store a dataset divided from an error correction coding (ECC) encoded version of the block and a second number of blockchain nodes that store a dataset comprised of redundant bits divided from the ECC encoded version of the block; calculating a priority value of the block based on the first number and the second number; and encoding at least a portion of the plurality of blocks using ECC to generate a plurality of encoded blocks based on the priority value.

Prioritizing shared blockchain data storage

Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based hierarchical data storage. One of the methods includes determining, based on a blockchain stored in a database that includes multiple levels of storage, a level of storage of the multiple levels of storage that meets a data migration condition as a target level of storage, wherein state data of the blockchain are stored as state Merkle trees in data worksheets of the multiple levels of storage, generating, for the target level of storage, an empty data worksheet in response to determining that the target level of storage meets the data migration condition, and storing at least a portion of a state Merkle tree corresponding to a newly created block of the blockchain to the empty data worksheet.

Blockchain based hierarchical data storage

Disclosed herein are methods, systems and apparatus, including computer programs encoded on computer storage media, for storing blockchain data. One of the methods includes receiving transactions issued by a client node communicably coupled to a permissioned blockchain network, sending the transactions to a plurality of validating nodes for validating the transactions and running consensus, receiving one or more blocks generated based on consensus of at least a portion of the transactions by the plurality of validating nodes, encoding the one or more blocks using ECC to generate one or more encoded blocks, and for each encoded block of the one or more encoded blocks: dividing the encoded block into a plurality of datasets based on a data storage scheme associated with the one or more blocks.

Blockchain data storage based on error correction code for permissioned blockchain network

A computer-implemented method includes: obtaining, by a blockchain node, an invoking request for a first smart contract based on receiving a data structure update transaction, where the transaction comprises an input parameter indicating an updated data structure. The updated data structure that is based on a computer programming language is obtained. The first smart contract is run, comprising: parsing the updated data structure and converting the updated data structure characterized by the computer programming language into updated metadata characterized by a definition description language. A second smart contract comprising pre-update metadata and data is invoked using the updated metadata as input parameters. The second smart contract is run, comprising: replacing the pre-update metadata with the updated metadata, parsing the updated metadata in the second smart contract, and updating a pre-update data structure of the data in the second smart contract based on a parsing result.

Data structure reading methods and apparatuses, data structure update methods and apparatuses, and electronic devices

One or more embodiments of the present specification provide data retrieving and recording methods and apparatuses, and electronic devices. One method comprises: identifying, by a blockchain node in a blockchain network, a data retrieving and recording request for a smart contract, wherein the data retrieving and recording request is configured to trigger a data retrieving and recording operation on a target object in a data set comprised in the smart contract; and parsing, by the blockchain node and to generate a parsing result, metadata comprised in the smart contract, wherein the parsing performs instructions comprised in the smart contract, and wherein the parsing result indicates a storage field corresponding to the target object in the data set for implementing the data retrieving and recording operation on the storage field.

Data read and write method and apparatus, and electronic device

A computer-implemented method for blockchain data storage includes generating, by one or more processing devices, a snapshot of a current state tree associated with a fixed depth Merkle tree (FDMT) during creation of a block of a blockchain, wherein the current state tree stores state information corresponding to a newest block of the blockchain; and storing, by the one or more processing devices, the snapshot of the current state tree.

Taking snapshots of blockchain data

One or more implementations of the present specification relate to blockchain-based cross-chain data access methods and apparatuses, and electronic devices. An access request that is specific to target data and that is sent by a node device is obtained. The target data is stored in a target blockchain of a multi-chain system that comprises a plurality of blockchains. The access request comprises an access path of the target data. The target blockchain that the target data is located in is determined based on the access path of the target data. A corresponding data access driver configured for the target blockchain is determined based on the access path of the target data. The data access driver is invoked to parse the access request and to access the target data.

Blockchain-based cross-chain data access method and apparatus

A method of storing blockchain state data, including: after execution of a transaction in a target block is completed, based on a latest account state of a target account related to the transaction in the target block after update, generating updated data nodes corresponding to the current Merkle state tree of the target block and, based on generated historical data nodes and data nodes other than the reused data nodes corresponding to the target account on the historical Merkle state tree of the previous block of the target block, creating the historical Merkle state tree for the target block.

Method and apparatus for storing blockchain state data and electronic device

A computer-implemented method for blockchain data storage includes sending a marker message from a first blockchain node in a first shard of a blockchain network to a second blockchain node in a phosphor of the blockchain network; receiving a marker block from the second blockchain node, wherein the marker block is associated with the phosphor and includes the marker message; creating a first block associated with the first shard that includes a block associated with the phosphor that immediately precedes the marker block; creating a second block associated with the first shard that includes the marker block; generating, during creation of the second block associated with the first shard, a snapshot of state information corresponding to a newest block associated with the first shard; and storing the snapshot of the state information.

A computer-implemented method includes: retrieving a plurality of blocks from a blockchain node of a blockchain network. The plurality of blocks are encoded using error correction coding (ECC) as encoded blocks. For each encoded block: The encoded block is divided into a plurality of datasets. Hash values of the plurality of datasets are calculated. A request that includes at least one of the plurality of datasets, the hash values, and a data storage scheme that provides assignments of the plurality of datasets to the plurality of blockchain nodes is sent to each of the plurality of blockchain nodes of the blockchain network. Responses for accepting the request is received from at least a number of blockchain nodes that equals a number of the one or more datasets of information bits. Each of the plurality of blockchain nodes is sent a notification for adopting the data storage scheme.

Consenus of shared blockchain data storage based on error correction code

Disclosed herein are methods, systems, and computer-readable media for storing blockchain data. Exemplary methods includes receiving a request from a blockchain node requesting removal from a blockchain network; identifying a plurality of blocks associated with blockchain data stored by the blockchain node; determining: a first difference between a number of remaining blockchain nodes excluding the blockchain node requesting removal and a maximum number of tolerable faulty blockchain nodes, a second difference between the number of remaining blockchain nodes storing a dataset of information bits or redundant bits divided from an ECC-encoded version of the block and the number of remaining blockchain nodes storing a dataset of redundant bits divided from the ECC-encoded version of the block, and smaller of the first and second difference; and retrieving blockchain data associated with the block from the blockchain node in response to determining that the first difference is less than the second difference.

Growing community of inventors

Hangzhou, China

Zhonghao Lu