Alibaba Group Holding Limited
Method and apparatus for verifying block data in a blockchain

Abstract:

The present solution discloses example methods and systems for verifying block data. One example method includes identifying newly added data to be stored in a blockchain, and selecting a data node in a block to store the newly added data. A string is generated based on the newly added data, and then a verification value for the newly added data is developed from the string using a predetermined algorithm. A new verification value for the block is calculated based on the verification value of the newly added data and the original verification values of the unchanged data nodes in the block. The new verification value for the block can then be used to verify the data stored in the block is consistent with data stored in the rest of the blockchain.