Advanced New Technologies Co., Ltd.

Alibaba Group Holding Limited

Alipay (hangzhou) Information Technology Co., Ltd.

Alipay Information Technology Co., Ltd.

Jiyuan Wang

Xuebing Yan

Huabing Du

This specification describes techniques for blockchain-based smart contract call. One example method includes receiving a target transaction initiated by a client device of a blockchain, wherein the target transaction is preconfigured for a call rule used to initiate a call for a smart contract; obtaining the call rule preconfigured for the target transaction; executing the call rule to initiate a call for a target smart contract; and providing a call result to the client device when the call for the target smart contract is completed.

Blockchain-based smart contract call methods and apparatus, and electronic device

A method for processing blockchain-based transactions, comprising: acquiring a Nonce record from a Nonce list for a transaction initiated by a user account, wherein the Nonce list is maintained in a blockchain and is associated with the user account, the Nonce list comprises a plurality of Nonce records, and a Nonce record comprises a Nonce value; adding the acquired Nonce record to the transaction; and submitting the transaction to the blockchain, for a node in the blockchain to compare the Nonce record in the transaction with the plurality of Nonce records in the Nonce list, and to accept the transaction in response to the Nonce record matching any Nonce record in the Nonce list, wherein the Nonce value in the matching Nonce record in the Nonce list is monotonically increased based on a preset increment in response to that the transaction is accepted.

Blockchain-based transaction processing method, apparatus, and electronic device

A target transaction initiated by a member node device in a blockchain is received, where the target transaction include a reference time parameter, and where the target transaction indicates a transfer of an asset and associated data released by the member node device to the blockchain for transfer to a candidate block. Based on the reference time parameter, a determination is performed as to whether the target transaction is a valid transaction within a transaction validity period. In response to determining that the target transaction is a valid transaction within the transaction validity period, the target transaction is recorded to the candidate block.

Blockchain-based transaction processing method and apparatus

A plurality of transactions initiated by a user through a user account and need to be concurrently executed is received. A Nonce list corresponding to the user account and maintained in a blockchain is accessed. The Nonce list includes a plurality of Nonce records, and each Nonce record includes a group identifier and a Nonce value. Available Nonce records are obtained for the plurality of transactions from the Nonce list. The available Nonce records are respectively added to the plurality of transactions. The plurality of transactions are published in the blockchain, so that a node device in the blockchain matches the available Nonce record in a transaction published by the client device with the Nonce records in the Nonce list. When the available Nonce record matches a target Nonce record in the Nonce list, the node device processes the transaction, and concurrently executes a plurality of the processed transactions.

Blockchain-based transaction processing method and apparatus and electronic device

One or more embodiments of the present specification provide blockchain-based transaction methods, apparatuses, and electronic devices. A target transaction sent by a node device of a transaction initiator is received. An account of the transaction initiator corresponds to a plurality of public keys, and the target transaction includes transaction content and a digital signature. The digital signature is created by using one or more private keys corresponding to the plurality of public keys of the account and is created based on at least a part of the transaction content. The target transaction is verified, including verifying whether the digital signature is valid. In response to a successful verification, the target transaction is recorded to a distributed database of a blockchain based on a consensus rule of the blockchain.

Blockchain transaction method and apparatus

A computer-implemented method for processing blockchain-based transactions, the computer-implemented method including: receiving a target transaction initiated by a member node device in a blockchain, wherein the target transaction comprises a unique identifier of the target transaction; querying a transaction idempotent table on the block chain to determine whether the transaction idempotent table has stored a transaction idempotent record corresponding to the unique identifier of the target transaction; and in response to determining that the transaction idempotent table has not stored the transaction idempotent record corresponding to the unique identifier of the target transaction, recording the target transaction in a candidate block on the blockchain.

Blockchain-based transaction processing method and apparatus, and electronic device

A computer-implemented method includes retrieving, by a bridge device communicatively linked to a blockchain network node of a blockchain network, a first set of blockchain blocks from the blockchain network node using a first set of threads of the bridge device; storing, by the bridge device, the first set of blockchain blocks in the bridge device; and verifying, by the bridge device, a second set of blockchain blocks that are stored in the bridge device using a second set of threads of the bridge device; and wherein retrieving the first set of blockchain blocks and verifying the second set of blockchain blocks are performed asynchronously using the first set of threads and the second set of threads.

Asynchronous processing of blockchain blocks

Embodiments of the present specification provide example blockchain-based data processing methods, mediums, and systems. One example method includes obtaining an available Nonce record for a target transaction from a Nonce list. The Nonce list comprises Nonce records, and each Nonce record comprises a version identifier of the Nonce list and a Nonce value. The available Nonce record to the target transaction is added. The target transaction in a blockchain is published. Prompt information indicating that the target transaction is an invalid transaction is received when a version identifier in the available Nonce record does not match the version identifier of the Nonce list; or a notification message indicating that the target transaction is processed is received when the version identifier in the available Nonce record matches the version identifier of the Nonce list and a replay attack detection is successfully performed by matching the available Nonce record with a Nonce record in the Nonce list.

Blockchain-based transaction processing methods and apparatuses and electronic devices

Implementations of the present specification include receiving a request to perform a private transaction associated with at least one account; in response to receiving the request, performing, by a workflow node, the private transaction; in response to performing the private transaction, generating, by the workflow node, a representation of the private transaction configured to be accessible only to entities that are authorized to access the private transaction; storing, in a private blockchain, the representation of the private transaction; generating, by the workflow node, an account record for the at least one account associated with the private transaction based at least in part on the private transaction, wherein the account record is configured to be accessible to at least one entity that is not authorized to access the representation of the private transaction in the private blockchain; and storing, in a public blockchain, the account record.

Data isolation in a blockchain network

Transaction processing method, apparatus, and electronic device using a blockchain having nonce records

One or more implementations of the present specification provide a blockchain-based data processing method and device. Block data in a blockchain is synchronized by a data center to a local database of the data center. The data center is connect to the blockchain and a target application. A data usage request sent by the target application is received by the data center. In response to the data usage request, the local database is queried, by the data center, for requested data corresponding to the data usage request. The requested data is returned, by the data center, to the target application.

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Hangzhou, China

Jiyuan Wang