Method for calculating confirmation reliability for blockchain based transaction and Blockchain network monitoring system for performing method

The invention relates to a method comprising acquiring information on a branch formed on blockchain data, and the method comprises the following steps: calculating a difference in a block height between a target block corresponding to a current block height of the blockchain data and a block in a non-branched state based on the information on the branch and calculating a transaction confirmation reliability of transaction data recorded in the target block based on the difference in the block height, wherein the transaction confirmation reliability indicates a probability that, for ask blocks are further connected after the target block, a position of the block at which the transaction data is recorded will not change, wherein k is an integer greater than zero. 本发明涉及种交易确定可信度计算方法及区块链网络监控系统。所述方法可以包括如下的步骤：获取与形成于区块链上的分支(branch)相关的信息；基于与所述分支相关的信息，计算所述区块链的当前的区块高度所对应的对象区块与非分支状态区块之间的区块高度差；以及基于所述区块高度差，计算针对记录于所述对象区块的交易数据的交易确定可信度。此时，所述交易确定可信度表示，随着在所述对象区块之后进步连接k个(在此，k为1以上的自然数)区块，记录有所述交易数据的区块的位置不会变更的概率。